Healthcare Realty Trust 10-K 17 Feb 15 2014 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
	Dec. 31, 2014	Jan. 31, 2015	Jun. 30, 2014
Document and Entity Information [Abstract]
Entity Registrant Name	HEALTHCARE REALTY TRUST INC
Entity Central Index Key	899749
Document Type	10-K
Document Period End Date	31-Dec-14
Amendment Flag	FALSE
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Current Fiscal Year End Date	-19
Entity Filer Category	Large Accelerated Filer
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Common Stock, Shares Outstanding		99,409,062
Entity Public Float			$2,414,583,343

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2014		Dec. 31, 2013
In Thousands, unless otherwise specified
Real estate properties:
Land	$183,060		$178,931
Buildings, improvements and lease intangibles	3,048,251		2,861,935
Personal property	9,914		9,267
Land held for development	17,054		17,054
Total real estate properties	3,258,279		3,067,187
Less accumulated depreciation	-700,671		-632,109
Total real estate properties, net	2,557,608		2,435,078
Cash and cash equivalents	3,519		8,671
Mortgage notes receivable	1,900	[1]	125,547	[1]
Assets held for sale and discontinued operations, net	9,146		6,852
Other assets, net	185,337		153,514
Total assets	2,757,510		2,729,662
Liabilities:
Notes and bonds payable	1,403,692	[2]	1,348,459	[2]
Accounts payable and accrued liabilities	70,240		73,741
Liabilities of discontinued operations	372		1,112
Other liabilities	62,152		61,064
Total liabilities	1,536,456		1,484,376
Commitments and contingencies
Stockholders' Equity:
Preferred stock, $.01 par value; 50,000 shares authorized; none issued and outstanding	0		0
Common stock, $.01 par value; 150,000 shares authorized; 98,828 and 95,924 shares issued and outstanding at December 31, 2014 and 2013, respectively.	988		959
Additional paid-in capital	2,389,830		2,325,228
Accumulated other comprehensive income (loss)	-2,519		51
Cumulative net income attributable to common stockholders	840,249		808,362
Cumulative dividends	-2,007,494		-1,891,123
Total stockholders’ equity	1,221,054		1,243,477
Noncontrolling interests	0		1,809
Total equity	1,221,054		1,245,286
Total liabilities and equity	$2,757,510		$2,729,662
[1]	Level 2 - Fair value based on quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-driven valuations in which significant inputs and significant value drivers are observable in active markets.
[2]	Level 3 - Fair value derived from valuation techniques in which one of more significant inputs or significant value drivers are unobservable.

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Statement of Financial Position [Abstract]
Preferred stock, par value (in dollars per share)	$0.01	$0.01
Preferred stock, authorized shares	50,000,000	50,000,000
Preferred stock, issued shares	0	0
Preferred stock, outstanding shares	0	0
Common stock, par value (in dollars per share)	$0.01	$0.01
Common stock, authorized shares	150,000,000	150,000,000
Common stock, issued shares	98,828,000	95,924,000
Common stock, outstanding shares	98,828,000	95,924,000

Consolidated_Statements_of_Ope

Consolidated Statements of Operations (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
REVENUES
Rental income	$361,525	$312,322	$282,444
Mortgage interest	3,665	12,701	9,186
Other operating	5,665	5,926	6,052
Total Revenue	370,855	330,949	297,682
EXPENSES
Property operating	134,057	122,571	113,287
General and administrative	22,808	23,704	20,881
Depreciation	99,384	86,239	79,776
Amortization	10,820	10,645	10,418
Bad debt, net of recoveries	31	172	230
Total Expenses	267,100	243,331	224,592
OTHER INCOME (EXPENSE)
Loss on extinguishment of debt		-29,638
Interest expense	-72,413	-73,511	-74,955
Gain on sale of cost method investment in real estate		1,492
Interest and other income, net	2,637	947	973
Total other income (expense)	-69,776	-100,710	-73,982
INCOME (LOSS) FROM CONTINUING OPERATIONS	33,979	-13,092	-892
DISCONTINUED OPERATIONS
Income from discontinued operations	967	5,246	10,461
Impairments	-12,029	-9,889	-14,908
Gain on sales of real estate properties	9,283	24,718	10,874
INCOME (LOSS) FROM DISCONTINUED OPERATIONS	-1,779	20,075	6,427
NET INCOME	32,200	6,983	5,535
Less: Net income attributable to noncontrolling interests	-313	-37	-70
NET INCOME ATTRIBUTABLE TO COMMON STOCKHOLDERS	$31,887	$6,946	$5,465
BASIC EARNINGS (LOSS) PER COMMON SHARE:
Income (loss) from continuing operations (in dollars per share)	$0.35	($0.14)	($0.01)
Discontinued operations (in dollars per share)	($0.02)	$0.22	$0.08
Net income (loss) attributable to common stockholders (in dollars per share)	$0.33	$0.08	$0.07
DILUTED EARNINGS (LOSS) PER COMMON SHARE:
Income (loss) from continuing operations (in dollars per share)	$0.35	($0.14)	($0.01)
Discontinued operations (in dollars per share)	($0.02)	$0.22	$0.08
Net income (loss) attributable to common stockholders (in dollars per share)	$0.33	$0.08	$0.07
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING - BASIC (in shares)	95,279,226	90,940,627	78,844,840
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING - DILUTED (in shares)	96,759,410	90,940,627	78,844,840

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
NET INCOME	$32,200	$6,983	$5,535
Other comprehensive income (loss):
Defined benefit pension plan net gain (loss) arising during the period	-2,570	2,143	1,240
Other comprehensive income (loss)	-2,570	2,143	1,240
COMPREHENSIVE INCOME	29,630	9,126	6,775
Less: Net income attributable to noncontrolling interests	-313	-37	-70
COMPREHENSIVE INCOME ATTRIBUTABLE TO COMMON STOCKHOLDERS	$29,317	$9,089	$6,705

Consolidated_Statements_of_Sto

Consolidated Statements of Stockholders' Equity (USD $)	Total	Preferred Stock	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive (Income) Loss	Cumulative Net Income	Cumulative Dividends	Total Stockholders' Equity	Non-controlling Interests
In Thousands, unless otherwise specified
Beginning Balance at Dec. 31, 2011	$1,004,806	$0	$779	$1,894,604	($3,332)	$795,951	($1,683,196)	$1,004,806
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock, net of costs	202,365		93	202,272				202,365
Common stock redemption	-68			-68				-68
Stock-based compensation	3,492		3	3,489				3,492
Net income	5,535					5,465		5,465	70
Defined benefit pension plan net loss	1,240				1,240			1,240
Dividends to common stockholders ($1.20 per share)	-96,356						-96,356	-96,356
Distributions to noncontrolling interests	-70								-70
Ending Balance at Dec. 31, 2012	1,120,944	0	875	2,100,297	-2,092	801,416	-1,779,552	1,120,944
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock, net of costs	220,259		83	220,176				220,259
Common stock redemption	-454			-454				-454
Stock-based compensation	5,210		1	5,209				5,210
Net income	6,983					6,946		6,946	37
Defined benefit pension plan net loss	2,143				2,143			2,143
Dividends to common stockholders ($1.20 per share)	-111,571						-111,571	-111,571
Distributions to noncontrolling interests	-34								-34
Proceeds from noncontrolling interest	1,806								1,806
Ending Balance at Dec. 31, 2013	1,245,286	0	959	2,325,228	51	808,362	-1,891,123	1,243,477	1,809
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock, net of costs	76,831		31	76,800				76,831
Common stock redemption	-10,074		-4	-10,070				-10,074
Stock-based compensation	4,451		2	4,449				4,451
Net income	32,200					31,887		31,887	313
Defined benefit pension plan net loss	-2,570				-2,570			-2,570
Dividends to common stockholders ($1.20 per share)	-116,371						-116,371	-116,371
Distributions to noncontrolling interests	-510								-510
Purchase of noncontrolling interest in consolidated joint ventures	-8,189			-6,577				-6,577	-1,612
Ending Balance at Dec. 31, 2014	$1,221,054	$0	$988	$2,389,830	($2,519)	$840,249	($2,007,494)	$1,221,054

Consolidated_Statements_of_Sto1

Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Dividend per share to common stockholders (in dollars per share)	$1.20	$1.20	$1.20
Cumulative Dividends
Dividend per share to common stockholders (in dollars per share)	$1.20	$1.20	$1.20
Total Stockholders' Equity
Dividend per share to common stockholders (in dollars per share)	$1.20	$1.20	$1.20

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net income	$32,200	$6,983	$5,535
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	116,049	105,318	101,444
Stock-based compensation	4,451	5,210	3,492
Straight-line rent receivable	-11,050	-8,608	-6,013
Straight-line rent liability	721	426	418
Gain on sales of real estate properties	-9,283	-24,718	-10,874
Gain on sale of cost method investment in real estate		-1,492
Loss on extinguishment of debt		29,907
Net gain from mortgage repayment by previously consolidated VIE			-313
Impairments	12,029	9,889	14,908
Provision for bad debt, net	34	185	240
Changes in operating assets and liabilities:
Other assets	-16,842	-5,660	-3,469
Accounts payable and accrued liabilities	-1,914	740	-712
Other liabilities	-1,025	2,617	11,741
Net cash provided by operating activities	125,370	120,797	116,397
INVESTING ACTIVITIES
Acquisitions of real estate	-71,899	-177,744	-89,640
Development of real estate			-7,833
Acquisition of additional long-lived assets	-70,670	-72,784	-62,251
Funding of mortgages and notes receivable	-1,244	-58,731	-78,297
Proceeds from acquisition of real estate upon mortgage note receivable default	204
Proceeds from sales of real estate	32,398	96,132	74,817
Proceeds from sale of cost method investment in real estate		2,717
Proceeds from mortgage repayment by previously consolidated VIE			35,057
Proceeds from mortgages and notes receivable repayments	5,623	2,464	14,893
Net cash used in investing activities	-105,588	-207,946	-113,254
FINANCING ACTIVITIES
Net borrowings (repayments) on unsecured credit facility	-153,000	128,000	-102,000
Borrowings on term loan	200,000
Borrowings on notes and bonds payable		247,948
Repayments on notes and bonds payable	-12,357	-19,984	-4,990
Redemption of notes and bonds payable		-371,839
Dividends paid	-116,371	-111,571	-96,356
Net proceeds from issuance of common stock	76,856	220,252	202,352
Common stock redemptions	-10,074	-454	-68
Capital contributions received from noncontrolling interest		1,806
Distributions to noncontrolling interest holders	-541	-32	-40
Distributions to noncontrolling interest holders	-8,189
Debt issuance and assumption costs	-1,258	-5,082	-3
Net cash provided by (used in) financing activities	-24,934	89,044	-1,105
Increase (decrease) in cash and cash equivalents	-5,152	1,895	2,038
Cash and cash equivalents, beginning of period	8,671	6,776	4,738
Cash and cash equivalents, end of period	3,519	8,671	6,776
Supplemental Cash Flow Information:
Interest paid	68,173	71,025	75,348
Capitalized interest		183	5,021
Company-financed real estate property sales	1,900	4,241	11,200
Invoices accrued for construction, tenant improvement and other capitalized costs	5,594	10,885	4,297
Elimination of construction mortgage note receivable upon acquisition real estate property	81,213	97,203
Mortgage notes payable assumed upon acquisition (adjusted to fair value)	19,636	40,992	5,171
Mortgage note receivable eliminated upon acquisition	39,973
Construction liabilities transferred upon deconsolidation of VIE			$3,450

Summary_of_Significant_Account

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies
	Business Overview
	Healthcare Realty Trust Incorporated (the “Company”) is a real estate investment trust ("REIT") that owns, acquires, manages, finances and develops income-producing real estate properties associated primarily with the delivery of outpatient healthcare services throughout the United States of America. The Company had investments of approximately $3.3 billion in 199 real estate properties, mortgages, land held for development and corporate property as of December 31, 2014. The Company’s 198 owned real estate properties are located in 30 states and total approximately 14.2 million square feet. The Company provided property management services to approximately 9.5 million square feet nationwide. Square footage disclosures in this Annual Report on Form 10-K are unaudited.
	Principles of Consolidation
	The Consolidated Financial Statements include the accounts of the Company, its wholly owned subsidiaries, joint ventures, partnerships and consolidated variable interest entities (“VIE”) where the Company controls the operating activities of the VIE.
	In accordance with the consolidation accounting standards, the Company must evaluate each contractual relationship it has with its lessees, borrowers, or others to determine whether or not the contractual arrangement creates a variable interest in those entities. If the Company determines that it has a variable interest and the entity is a VIE, then management must determine whether or not the Company is the primary beneficiary of the VIE, resulting in consolidation of the VIE. A primary beneficiary has the power to direct those activities of the VIE that most significantly impact its economic performance and has the obligation to absorb the losses of, or receive the benefits from, the VIE.
	The Company had a variable interest in unconsolidated VIEs consisting of one construction mortgage notes receivable aggregating approximately $80.0 million as of December 31, 2013, in which management concluded that the Company was not the primary beneficiary. See Note 5 for more information on this construction mortgage notes receivable. There were no VIEs at December 31, 2014.
	During 2014, the Company acquired the outstanding 40% noncontrolling interest holders' investment in a partnership, HRP MAC III, LLC, that held $18.0 million in real estate assets and owns 100% as of December 31, 2014. During 2013, the Company received capital contributions of $1.8 million from a 40% noncontrolling interest holder in the partnership. The Company reports noncontrolling interests in subsidiaries as a component of equity and the related net income or loss attributable to the noncontrolling interests as part of consolidated net income or loss in its Consolidated Financial Statements. See Note 4 for additional information.
	All significant intercompany accounts, transactions and balances have been eliminated upon consolidation in the Consolidated Financial Statements.
	Use of Estimates in the Consolidated Financial Statements
	Preparation of the Consolidated Financial Statements in accordance with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect amounts reported in the Consolidated Financial Statements and accompanying notes. Actual results may differ from those estimates.
	Segment Reporting
	The Company owns, acquires, manages, finances and develops outpatient and other healthcare-related properties. The Company is managed as one reporting unit, rather than multiple reporting units, for internal reporting purposes and for internal decision-making. Therefore, the Company discloses its operating results in a single reportable segment.
	Reclassifications
	Certain reclassifications for discontinued operations have been made to the Consolidated Statements of Operations for the years ended December 31, 2013 and 2012 to conform to the 2014 presentation. The operating results of those assets have been reclassified from continuing to discontinued operations for all periods presented.
	Real Estate Properties
	Real estate properties are recorded at cost or at fair value if acquired in a transaction that is a business combination under Accounting Standards Codification Topic 805, Business Combinations. Cost or fair value at the time of acquisition is allocated among land, buildings, tenant improvements, lease and other intangibles, and personal property as applicable. The Company’s gross real estate assets, on a financial reporting basis, totaled approximately $3.3 billion as of December 31, 2014 and $3.1 billion as of December 31, 2013.
	During 2014 and 2013, the Company eliminated against accumulated depreciation approximately $9.5 million and $4.3 million, respectively, of fully amortized real estate intangibles that were initially recorded as a component of certain real estate acquisitions. Also during 2014, approximately $0.4 million of fully depreciated tenant and capital improvements that were no longer in service were eliminated against accumulated depreciation.
	Depreciation and amortization of real estate assets and liabilities in place as of December 31, 2014, is provided for on a straight-line basis over the asset’s estimated useful life:
	Land improvements	15.0 to 38.1 years
	Buildings and improvements	3.3 to 39.0 years
	Lease intangibles (including ground lease intangibles)	1.0 to 93.1 years
	Personal property	1.9 to 15.8 years
	The Company capitalizes direct costs, including costs such as construction costs and professional services, and indirect costs, including capitalized interest and overhead costs, associated with the development and construction of real estate assets while substantive activities are ongoing to prepare the assets for their intended use. Capitalized interest cost is calculated using the weighted average interest rate of the Company's unsecured debt or the interest rate on project specific debt, if applicable. The Company continues to capitalize interest on the unoccupied portion of the properties in stabilization for up to one year after the buildings have been placed into service, at which time the capitalization of interest must cease.
	Land Held for Development
	Land held for development includes parcels of land owned by the Company, upon which the Company intends to develop and own outpatient healthcare facilities. The Company’s investment in land held for development totaled approximately $17.1 million as of December 31, 2014 and 2013.
	Asset Impairment
	The Company assesses the potential for impairment of identifiable, definite-lived, intangible assets and long-lived assets, including real estate properties, whenever events occur or a change in circumstances indicates that the carrying value might not be fully recoverable. Indicators of impairment may include significant underperformance of an asset relative to historical or expected operating results; significant changes in the Company’s use of assets or the strategy for its overall business; plans to sell an asset before its depreciable life has ended; the expiration of a significant portion of leases in a property; or significant negative economic trends or negative industry trends for the Company or its operators. In addition, the Company reviews for possible impairment, those assets subject to purchase options and those impacted by casualties, such as tornadoes and hurricanes. If management determines that the carrying value of the Company’s assets may not be fully recoverable based on the existence of any of the factors above, or others, management would measure and record an impairment charge based on the estimated fair value of the property or the estimated fair value less costs to sell the property.
	Acquisitions of Real Estate Properties with In-Place Leases
	Acquisitions of real estate properties are accounted for at fair value. When a building with in-place leases is acquired, the cost of the acquisition must be allocated between the tangible real estate assets "as-if vacant" and the intangible real estate assets related to in-place leases based on their estimated fair values. Where appropriate, the intangible assets recorded could include goodwill or customer relationship assets. The values related to above- or below-market in-place lease intangibles are amortized to rental income where the Company is the lessor, are amortized to property operating expense where the Company is the lessee, and are amortized over the remaining term of the leases upon acquisition.
	The Company considers whether any of the in-place lease rental rates are above- or below-market. An asset (if the actual rental rate is above-market) or a liability (if the actual rental rate is below-market) is calculated and recorded in an amount equal to the present value of the future cash flows that represent the difference between the actual lease rate and the average market rate. If an in-place lease is identified as a below-market rental rate, the Company would also evaluate any renewal options associated with that lease to determine if the intangible should include those periods.
	The Company also estimates an absorption period, which can vary by property, assuming the building is vacant and must be leased up to the actual level of occupancy when acquired. During that absorption period, the owner would incur direct costs, such as tenant improvements, and would suffer lost rental income. Likewise, the owner would have acquired a measurable asset in that, assuming the building was vacant, certain fixed costs would be avoided because the actual in-place lessees would reimburse a certain portion of fixed costs through expense reimbursements during the absorption period.
	All of these intangible assets (above- or below-market lease, tenant improvement costs avoided, rental income lost, and expenses recovered through in-place lessee reimbursements) are estimated and recorded in amounts equal to the present value of estimated future cash flows. The actual purchase price is allocated based on the various asset fair values described above.
	The building and tenant improvement components of the purchase price are depreciated over the estimated useful life of the building or the weighted average remaining term of the in-places leases. The above- or below-market rental rate assets or liabilities are amortized to rental income or property operating expense over the remaining term of the leases. The at-market, in-place lease intangibles are amortized to amortization expense over the weighted average remaining term of the leases, customer relationship assets are amortized to amortization expense over terms applicable to each acquisition, and any goodwill recorded would be reviewed for impairment at least annually.
	The fair values of at-market in-place lease and other intangible assets are amortized and reflected in amortization expense in the Company’s Consolidated Statements of Operations. See Note 9 for more details on the Company’s intangible assets.
	Fair Value Measurements
	Fair value is defined as the price that would be received to sell an asset, or paid to transfer a liability, in an orderly transaction between market participants. In calculating fair value, a company must maximize the use of observable market inputs, minimize the use of unobservable market inputs and disclose in the form of an outlined hierarchy the details of such fair value measurements.
	A hierarchy of valuation techniques is defined to determine whether the inputs to a fair value measurement are considered to be observable or unobservable in a marketplace. Observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect the Company’s market assumptions. This hierarchy requires the use of observable market data when available. These inputs have created the following fair value hierarchy:
	•	Level 1 – quoted prices for identical instruments in active markets;
	•	Level 2 – quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations in which significant inputs and significant value drivers are observable in active markets; and
	•	Level 3 – fair value measurements derived from valuation techniques in which one or more significant inputs or significant value drivers are unobservable.
	Executed purchase and sale agreements, that are binding agreements, are categorized as level one inputs. Brokerage estimates, letters of intent, or unexecuted purchase and sale agreements are considered to be level three as they are nonbinding in nature.
	During 2014, in connection with the sales of six medical office buildings, the Company recorded impairment charges in discontinued operations of approximately $3.7 million based on the contractual sales price, a level one input. The Company used level three inputs to record impairment charges of approximately $8.3 million related to two properties in held for sale and two properties that were reclassified to held for sale during 2014, reducing the Company's carrying value to the estimated fair value of the properties less costs to sell prior to sale. All four of these properties were sold during 2014.
	Cash and Cash Equivalents
	Cash and cash equivalents includes short-term investments with original maturities of three months or less when purchased.
	Allowance for Doubtful Accounts and Credit Losses
	Accounts Receivable
	Management monitors the aging and collectibility of its accounts receivable balances on an ongoing basis. Whenever deterioration in the timeliness of payment from a tenant or sponsoring health system is noted, management investigates and determines the reason or reasons for the delay. Considering all information gathered, management’s judgment is exercised in determining whether a receivable is potentially uncollectible and, if so, how much or what percentage may be uncollectible. Among the factors management considers in determining collectibility are: the type of contractual arrangement under which the receivable was recorded (e.g., a triple net lease, a gross lease, a property operating agreement, or some other type of agreement); the tenant’s reason for slow payment; industry influences under which the tenant operates; evidence of willingness and ability of the tenant to pay the receivable; credit-worthiness of the tenant; collateral, security deposit, letters of credit or other monies held as security; tenant’s historical payment pattern; other contractual agreements between the tenant and the Company; relationship between the tenant and the Company; the state in which the tenant operates; and the existence of a guarantor and the willingness and ability of the guarantor to pay the receivable. Considering these factors and others, management concludes whether all or some of the aged receivable balance is likely uncollectible. Upon determining that some portion of the receivable is likely uncollectible, the Company records a provision for bad debts for the amount it expects will be uncollectible. When efforts to collect a receivable are exhausted, the receivable amount is charged off against the allowance. The Company does not hold any accounts receivable for sale.
	Mortgage Notes
	The Company had one and four mortgage notes receivable outstanding as of December 31, 2014 and 2013 with aggregate principal balances totaling $1.9 million and $125.5 million, respectively. The weighted average maturity of the notes was approximately 2.8 and 0.4 years, respectively, with an interest rate of 6.50% and interest rates ranging from 5.00% to 7.72%, as of December 31, 2014 and 2013, respectively.
	No allowances were recorded on the Company's mortgage notes receivable during 2014 or 2013. The Company evaluates collectibility of its mortgage notes and records allowances on the notes as necessary. A loan is impaired when it is probable that a creditor will be unable to collect all amounts due according to the contractual terms of the loan as scheduled, including both contractual interest and principal payments. This assessment also includes an evaluation of the loan collateral. If a mortgage loan becomes past due, the Company will review the specific circumstances and may discontinue the accrual of interest on the loan. The loan is not returned to accrual status until the debtor has demonstrated the ability to continue debt service in accordance with the contractual terms. Loans placed on non-accrual status will be accounted for either on a cash basis, in which income is recognized only upon receipt of cash, or on a cost-recovery basis, in which all cash receipts reduce the carrying value of the loan, based on the Company’s expectation of future collectibility. As of December 31, 2014 and 2013, there were no recorded investments in mortgage notes that were either on non-accrual status or were past due more than ninety days and continued to accrue interest. Also, as of December 31, 2014, the Company did not hold any of its mortgage notes available for sale.
	In January 2014, one of the Company's mortgage notes receivable had a scheduled balloon payment due of $40.0 million that the borrower was not able to pay. The Company initiated the default process and negotiated a deed in lieu of foreclosure from the borrower. See Note 4 for additional information regarding this transaction.
	Goodwill and Other Intangible Assets
	Goodwill and intangible assets with indefinite lives are not amortized, but are tested at least annually for impairment. Intangible assets with finite lives are amortized over their respective lives to their estimated residual values and are reviewed for impairment only when impairment indicators are present.
	Identifiable intangible assets of the Company are comprised of enterprise goodwill, in-place lease intangible assets, customer relationship intangible assets, and deferred financing costs. In-place lease and customer relationship intangible assets are amortized on a straight-line basis over the applicable lives of the assets. Deferred financing costs are amortized over the term of the related credit facility or other debt instrument under the straight-line method, which approximates amortization under the effective interest method. Goodwill is not amortized but is evaluated annually as of December 31 for impairment. Both the 2014 and 2013 impairment evaluations indicated that no impairment had occurred with respect to the $3.5 million goodwill asset. See Note 9 for more detail on the Company’s intangible assets.
	Contingent Liabilities
	From time to time, the Company may be subject to loss contingencies arising from legal proceedings and similar matters. Additionally, while the Company maintains comprehensive liability and property insurance with respect to each of its properties, the Company may be exposed to unforeseen losses related to uninsured or underinsured damages.
	The Company continually monitors any matters that may present a contingent liability, and, on a quarterly basis, management reviews the Company’s reserves and accruals in relation to each of them, adjusting provisions as necessary in view of changes in available information. Liabilities for contingencies are first recorded when a loss is determined to be both probable and can be reasonably estimated. Changes in estimates regarding the exposure to a contingent loss are reflected as adjustments to the related liability in the periods when they occur.
	Because of uncertainties inherent in the estimation of contingent liabilities, it is possible that the Company’s provision for contingent losses could change materially in the near term. To the extent that any significant losses, in addition to amounts recognized, are at least reasonably possible, such amounts will be disclosed in the notes to the Consolidated Financial Statements.
	Defined Benefit Pension Plan
	The Company has a pension plan under which three of the Company’s founding officers may receive retirement benefits upon retirement (the “Executive Retirement Plan”). The plan is unfunded and benefits will be paid from cash flows of the Company. The Company recognizes pension expense on an accrual basis over an estimated service period. The Company calculates pension expense and the corresponding liability annually on the measurement date (December 31) which requires certain assumptions, such as a discount rate and the recognition of actuarial gains and losses. The maximum annual benefits payable to each individual under the plan have been frozen at $0.9 million, subject to cost-of-living adjustments.
	Stock-Based Compensation
	The Company has various employee and director stock-based awards outstanding. These awards include non-vested common stock and options to purchase common stock granted to employees pursuant to the 2007 Employees Stock Incentive Plan and its predecessor plan (the “Incentive Plan”) and the 2000 Employee Stock Purchase Plan (the “Employee Stock Purchase Plan”). The Company recognizes share-based payments to employees and directors in the Consolidated Statements of Operations on a straight-line basis over the requisite service period based on the fair value of the award on the measurement date.
	The Employee Stock Purchase Plan features a “look-back” provision which enables the employee to purchase a fixed number of common shares at the lesser of 85% of the market price on the date of grant or 85% of the market price on the date of exercise, with optional purchase dates occurring once each quarter for 27 months. The Company accounts for awards to its employees under the Employee Stock Purchase Plan based on fair value, using the Black-Scholes model, and generally recognizes expense over the award’s vesting period, net of estimated forfeitures. Since the options granted under the Employee Stock Purchase Plan immediately vest, the Company records compensation expense for those options when they are granted in the first quarter of each year and then may record additional compensation expense in subsequent quarters as warranted. In each of the years ended December 31, 2014, 2013 and 2012, the Company recognized in general and administrative expenses approximately $0.3 million, $0.3 million, and $0.4 million, respectively, of compensation expense related to the annual grant of options to its employees to purchase shares under the Employee Stock Purchase Plan.
See Note 13 for details on the Company’s stock-based awards.
Accumulated Other Comprehensive Income (Loss)
Certain items must be included in comprehensive income, including items such as foreign currency translation adjustments, minimum pension liability adjustments, and unrealized gains or losses on available-for-sale securities. The Company’s accumulated other comprehensive income (loss) consists of only the cumulative pension liability adjustments, which are generally recognized in the fourth quarter of each year.
Revenue Recognition
The Company recognizes revenue when it is realized or realizable and earned. There are four criteria that must all be met before a Company may recognize revenue, including that persuasive evidence that an arrangement exists, delivery has occurred or services have been rendered (i.e., the tenant has taken possession of and controls the physical use of the leased asset), the price has been fixed or is determinable, and collectibility is reasonably assured. Income received but not yet earned is deferred until such time it is earned. Deferred revenue, included in other liabilities on the Consolidated Balance Sheets, was $35.4 million and $36.3 million, respectively, as of December 31, 2014 and 2013 which includes deferred tenant improvement reimbursements of $22.4 million and $21.9 million, respectively, which will be recognized as revenue over the life of each respective lease.
The Company derives most of its revenues from its real estate property and mortgage notes receivable portfolio. The Company’s rental and mortgage interest income is recognized based on contractual arrangements with its tenants, sponsoring health systems or borrowers. These contractual arrangements fall into three categories: leases, mortgage notes receivable, and property operating agreements as described in the following paragraphs. The Company may accrue late fees based on the contractual terms of a lease or note. Such fees, if accrued, are included in rental income or mortgage interest income on the Company’s Consolidated Statements of Operations, based on the type of contractual agreement.
Rental Income
Rental income related to non-cancelable operating leases is recognized as earned over the life of the lease agreements on a straight-line basis. The Company's lease agreements generally include provisions for stated annual increases or increases based on a Consumer Price Index ("CPI"). Rental income from properties under multi-tenant office lease arrangements and rental income from properties with single-tenant lease arrangements are included in rental income on the Company's Consolidated Statements of Operations.
The components of rental income are as follows:
	Year Ended December 31,
(Dollars in thousands)	2014		2013		2012
Property operating income	$	285,304	$	251,403	$	233,662
Single-tenant net lease	65,252		51,467		42,183
Straight-line rent	10,969		9,452		6,599
Rental income	$	361,525	$	312,322	$	282,444
Operating expense recoveries, included in property operating income, were approximately $53.9 million, $40.9 million and $31.9 million, respectively, for the years ended December 31, 2014, 2013 and 2012.
Additional rent, generally defined in most lease agreements as the cumulative increase in CPI from the lease start date to the CPI as of the end of the previous year, is calculated as of the beginning of each year, and is then billed and recognized as income during the year as provided for in the lease. Included in rental income was additional rental income, net of reserves, of approximately $0.7 million for the years ended December 31, 2014, 2013 and 2012.
Mortgage Interest Income
Interest income on the Company’s mortgage notes receivable is recognized based on the interest rates, maturity dates and amortization periods in accordance with each note agreement. The interest rate on its one mortgage note receivable outstanding as of December 31, 2014 was fixed. The Company amortizes any fees paid related to its mortgage notes receivable to mortgage interest income over the term of the loan on a straight-line basis which approximates amortization under the effective interest method.
Other Operating Income
Other operating income on the Company’s Consolidated Statements of Operations was comprised of the following:
	Year Ended December 31,
(Dollars in thousands)	2014		2013		2012
Property lease guaranty revenue	$	4,430	$	5,114	$	4,898
Interest income	731		457		448
Management fee income	289		164		158
Other	215		191		548
	$	5,665	$	5,926	$	6,052
Five of the Company’s 198 owned real estate properties as of December 31, 2014 were covered under property operating agreements between the Company and a sponsoring health system, which contractually obligate the sponsoring health system to provide to the Company a minimum return on the Company’s investment in the property in exchange for the right to be involved in the operating decisions of the property, including tenancy. If the minimum return is not achieved through normal operations of the property, the Company calculates and accrues to property lease guaranty revenue, each quarter, any shortfalls due from the sponsoring health systems under the terms of the property operating agreement.
Interest income generally relates to interest on tenant improvement reimbursements as defined in each note or lease agreement.
Management fees for property management services provided to third parties are generally calculated, accrued and billed monthly based on a percentage of cash collections of tenant receivables for the month or a stated amount per square foot. Management fees related to the Company’s owned properties are eliminated in consolidation.
Federal Income Taxes
No provision has been made for federal income taxes. The Company intends at all times to qualify as a REIT under Sections 856 through 860 of the Internal Revenue Code of 1986, as amended (the “Internal Revenue Code”). The Company must distribute at least 90% per annum of its real estate investment trust taxable income to its stockholders and meet other requirements to continue to qualify as a real estate investment trust. See Note 16 for further discussion.
The Company classifies interest and penalties related to uncertain tax positions, if any, in the Consolidated Financial Statements as a component of general and administrative expenses. No such amounts were recognized during the three years ended December 31, 2014.
Federal tax returns for the years 2011, 2012 and 2013 are currently subject to examination by taxing authorities.
State Income Taxes
The Company must pay certain state income taxes and the provisions for such taxes are generally included in general and administrative expense on the Company’s Consolidated Statements of Operations. See Note 16 for further discussion.
Sales and Use Taxes
The Company must pay sales and use taxes to certain state tax authorities based on rents collected from tenants in properties located in those states. The Company is generally reimbursed for these taxes by the tenant. The Company accounts for the payments to the taxing authority and subsequent reimbursement from the tenant on a net basis in revenues in the Company’s Consolidated Statements of Operations.
Discontinued Operations
The Company sells properties from time to time due to a variety of factors, including among other things, market conditions or the exercise of purchase options by tenants. The operating results of properties that have been sold or are held for sale are reported as discontinued operations in the Company’s Consolidated Statements of Operations for all periods presented. A company must report discontinued operations when a component of an entity has either been disposed of or is deemed to be held for sale if (i) both the operations and cash flows of the component have been or will be eliminated from ongoing operations as a result of the disposal transaction, and (ii) the entity will not have any significant continuing involvement in the operations of the component after the disposal transaction. Long-lived assets held for sale are reported at the lower of their carrying amount or their fair value less cost to sell estimate. Further, depreciation of these assets ceases at the time the assets are classified as discontinued operations. Losses resulting from the sale of such properties are characterized as impairment losses relating to discontinued operations in the Consolidated Statements of Operations. See Note 6 for more detail on discontinued operations.
Earnings per Share
Basic earnings per common share is calculated using weighted average shares outstanding less issued and outstanding non-vested shares of common stock. Diluted earnings per common share is calculated using weighted average shares outstanding plus the dilutive effect of the outstanding stock options from the Employee Stock Purchase Plan and non-vested shares of common stock using the treasury stock method and the average stock price during the period. See Note 14 for the calculations of earnings per share.
New Accounting Pronouncements
Accounting Standards Update No. 2014-08
In April 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update No. 2014-08, “Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity.” This standard changes the requirements for reporting discontinued operations by raising the threshold for a disposal to qualify as a discontinued operation and requires new disclosures of both discontinued operations and certain other disposals that do not meet the definition of a discontinued operation. The standard limits discontinued operations reporting to disposals of components of an entity that represent strategic shifts that have (or will have) a major effect on an entity’s operations and financial results.
This standard is effective for the Company on a prospective basis for annual periods beginning on January 1, 2015 and interim periods within that year. Early adoption is permitted but only for disposals (or classifications as held for sale) that have not been reported in financial statements previously issued. The Company adopted this standard on the effective date of January 1, 2015 and does not expect it to have a material impact on the Company's consolidated financial position or cash flows, but could have a material impact on the presentation of the Consolidated Statement of Operations.
Accounting Standards Update No. 2014-09
In May 2014, the FASB issued Accounting Standards Update No. 2014-09, "Revenue from Contracts with Customers", a comprehensive new revenue recognition standard that supersedes most all existing revenue recognition guidance, including sales of real estate. This standard's core principle is that a company will recognize revenue when it transfers goods or services to customers in amounts that reflect the consideration to which the company expects to be entitled in exchange for those goods and services. However, leasing contracts, representing the major source of the Company's revenues, are not within the scope of the new standard and will continue to be accounted for under existing standards.
This new standard is effective for the Company for annual and interim periods beginning on January 1, 2017 with early adoption prohibited. The Company has not yet determined the effects on the Consolidated Financial Statements and related notes resulting from the adoption of this new standard.

Property_Investments

Property Investments	12 Months Ended
	Dec. 31, 2014
Real Estate Investment Property, Net [Abstract]
Property Investments	Property Investments
	The Company invests in healthcare-related properties and mortgages located throughout the United States. The Company provides management, leasing and development services, and capital for the construction of new facilities, as well as for the acquisition of existing properties. The Company had investments of approximately $3.3 billion in 199 real estate properties, mortgages, land held for development and corporate property as of December 31, 2014. The following table summarizes the Company’s investments.
	(Dollars in thousands)	Number of Facilities	Land		Buildings, Improvements, and Lease Intangibles		Personal Property		Total		Accumulated Depreciation
	Medical office/outpatient:
	Arizona	9	$	3,726	$	78,398	$	441	$	82,565	$	(22,521	)
	California	9	17,430		104,983		195		122,608		(53,254		)
	Colorado	9	7,197		188,593		208		195,998		(18,338		)
	District of Columbia	2	—		30,729		—		30,729		(8,992		)
	Florida	8	6,891		90,674		252		97,817		(43,774		)
	Hawaii	3	8,327		121,022		68		129,417		(17,726		)
	Illinois	3	6,142		49,194		143		55,479		(11,100		)
	Indiana	5	3,891		140,749		—		144,640		(22,575		)
	Iowa	6	12,665		81,424		94		94,183		(13,346		)
	Michigan	3	5		23,158		33		23,196		(7,644		)
	Missouri	4	4,668		32,574		7		37,249		(16,998		)
	North Carolina	16	5,096		156,538		95		161,729		(34,824		)
	Oklahoma	2	7,673		100,543		—		108,216		(1,486		)
	Tennessee	14	10,353		183,414		255		194,022		(58,932		)
	Texas	43	45,036		621,608		1,290		667,934		(145,509		)
	Virginia	13	2,451		183,340		136		185,927		(36,277		)
	Washington	8	8,974		201,227		186		210,387		(22,784		)
	Other (12 states)	16	7,248		155,992		91		163,331		(49,142		)
		173	157,773		2,544,160		3,494		2,705,427		(585,222		)
	Inpatient:
	Arizona	1	3,641		12,371		—		16,012		(1,839		)
	California	1	—		12,688		—		12,688		(6,630		)
	Colorado	1	623		10,788		—		11,411		(362		)
	Indiana	1	1,071		42,335		—		43,406		(9,227		)
	Missouri	1	1,989		109,304		—		111,293		(3,503		)
	Pennsylvania	4	6,555		74,634		—		81,189		(38,166		)
	Texas	5	9,507		158,149		265		167,921		(24,558		)
		14	23,386		420,269		265		443,920		(84,285		)
	Other:
	Alabama	1	181		9,925		8		10,114		(6,605		)
	Indiana	1	96		3,662		32		3,790		(2,477		)
	Iowa	1	—		40,263		—		40,263		(1,536		)
	Michigan	5	193		12,728		183		13,104		(8,379		)
	Tennessee	1	253		7,213		408		7,874		(2,279		)
	Virginia	2	1,178		10,031		48		11,257		(6,054		)
		11	1,901		83,822		679		86,402		(27,330		)
	Land Held for Development	—	17,054		—		—		17,054		(115		)
	Corporate Property	—	—		—		5,476		5,476		(3,719		)
		—	17,054		—		5,476		22,530		(3,834		)
	Total owned properties	198	200,114		3,048,251		9,914		3,258,279		(700,671		)
	Mortgage notes receivable	1	—		—		—		1,900		—
	Total real estate investments	199	$	200,114	$	3,048,251	$	9,914	$	3,260,179	$	(700,671	)

Real_Estate_Leases

Real Estate Leases	12 Months Ended
	Dec. 31, 2014
Leases [Abstract]
Real Estate Leases	Real Estate Leases
	Real Estate Leases
	The Company’s properties are generally leased pursuant to non-cancelable, fixed-term operating leases or are supported through other financial support arrangements with expiration dates through 2033. Some leases and financial arrangements provide for fixed rent renewal terms in addition to market rent renewal terms. Some leases provide the lessee, during the term of the lease and for a short period thereafter, with an option or a right of first refusal to purchase the leased property. The Company’s portfolio of single-tenant net leases generally requires the lessee to pay minimum rent, additional rent based upon fixed percentage increases or increases in the Consumer Price Index and all taxes (including property tax), insurance, maintenance and other operating costs associated with the leased property.
	Future minimum lease payments under the non-cancelable operating leases and guaranteed amounts due to the Company under property operating agreements as of December 31, 2014 are as follows (in thousands):
	2015	$	290,283
	2016	263,505
	2017	235,690
	2018	203,285
	2019	166,003
	2020 and thereafter	679,757
		$	1,838,523
	Revenue Concentrations
	The Company’s real estate portfolio is leased to a diverse tenant base. The Company had one customer, Baylor Scott & White Health, that accounted for 10% or more of the Company’s consolidated revenues, including revenues from discontinued operations, for the years ended December 31, 2014 and 2013 at 10% and 11%, respectively. The Company did not have any customers that accounted for 10% or more of the Company's consolidated revenues, including discontinued operations for the year ended December 31, 2012.
	Purchase Option Provisions
	Certain of the Company’s leases include purchase option provisions. The provisions vary by agreement but generally allow the lessee to purchase the property covered by the agreement at fair market value or an amount equal to the Company’s gross investment. The Company expects that the purchase price from its purchase options will be greater than its net investment in the properties at the time of potential exercise. The Company had approximately $162.2 million in real estate properties as of December 31, 2014 that were subject to purchase options that were exercisable or become exercisable during 2015.
	Purchase Option Exercise
	In September 2014, the Company received notice from a tenant of its intent to purchase a medical office building in Pennsylvania pursuant to a purchase option contained in its lease with the Company. The Company's net investment in the building, included in assets held for sale, was $7.7 million at December 31, 2014, including straight-line rent receivables. The appraisal process is on-going and the purchase price, if the transaction closes, would be the greater of fair market value or approximately $15.0 million.

Acquisitions_Dispositions_and_

Acquisitions, Dispositions and Mortgage Repayments	12 Months Ended
	Dec. 31, 2014
Acquisitions and Dispositions and Mortgage Repayments [Abstract]
Acquisitions, Dispositions and Mortgage Repayments	Acquisitions, Dispositions and Mortgage Repayments
	2014 Real Estate Acquisitions
	During 2014, the Company acquired the following properties:
	•	a 152,655 square foot multi-tenanted office building in Iowa in which the Company acquired ownership in satisfaction of a $40.0 million mortgage note receivable that matured on January 10, 2014. The cash flows from the operations of the property were sufficient to pay the Company interest from the maturity date through the date of the transfer of ownership to the Company at the 7.7% fixed interest rate plus an additional 3% of interest for the default interest rate. The Company has accounted for this transaction as a business combination and recorded the acquisition of the property at its estimated fair value based primarily on level three inputs. Upon acquisition, the property was 93% leased with expirations through 2023;
	•	a 200,000 square foot medical office building in Oklahoma for a purchase price of approximately $85.4 million that was 100% leased to Mercy Health, based in Missouri, through 2028 under a single-tenant net lease. The Company funded the development of the facility through a construction mortgage loan of approximately $81.2 million that upon purchase was eliminated in the Company's Consolidated Financial Statements. At the closing of the purchase, the outstanding loan balance was credited to the purchase price and the Company paid an additional $4.2 million in cash consideration. Subsequent to the purchase, the Company funded an additional $5.0 million and anticipates funding approximately $0.8 million to complete the $91.2 million development during 2015;
	•	56.9% of a medical office building and related land in Texas through an equity interest in a limited liability company for a purchase price and cash consideration of $8.7 million. Based on the nature of the transaction, the Company has accounted for the acquisition as an asset acquisition and has recorded the amounts in real estate assets on the Company's Consolidated Balance Sheet. Upon acquisition, the property was 95% leased with expirations through 2024. The building is adjacent to Seton Medical Center, a 534-bed hospital;
	•	a 35,292 square foot medical office building located in North Carolina for a purchase price and cash consideration of $6.5 million. Upon acquisition, the property was 100% leased with expirations through 2024. The building is adjacent to Wesley Long Hospital, a 175-bed hospital;
	•	a 60,476 square foot medical office building located in Minnesota for a purchase price of $19.8 million including cash consideration of $8.4 million and the assumption of debt of $11.4 million (excluding a $1.0 million fair value premium recorded upon acquisition). The mortgage notes payable assumed by the Company bear a weighted average contractual interest rate of 6.67% with maturities from 2017 to 2040. The property was constructed in 2010 and, upon acquisition, was 100% leased with expirations through 2025. The building is connected to Unity Hospital, a 220-bed hospital operated by Allina Health;
	•	a 47,962 square foot medical office building located in Florida for a purchase price and cash consideration of $7.9 million. Upon acquisition, the property was 89% leased with expirations through 2019. The building is adjacent to Tampa General Hospital, a 1,018-bed hospital;
	•	a 68,860 square foot medical office building in Oklahoma for a purchase price of $17.5 million, including cash consideration of $10.7 million and the assumption of debt of $6.8 million (excluding a $0.4 million fair value premium recorded upon acquisition). The mortgage note payable assumed by the Company bears a contractual interest rate of 6.1% and matures on August 1, 2020. Upon acquisition, the property was 97% leased with expirations through 2027. The building is located on the Norman Regional Healthplex campus, a 152-bed hospital; and
	•	a 60,161 square foot medical office building in Washington for a purchase price and cash consideration of $22.7 million. Upon acquisition, the property was 98% leased with expirations through 2021 and is located on the Highline Medical Center campus, a 177-bed hospital.
	The following table details the Company's acquisitions for the twelve months ended December 31, 2014:
	(Dollars in millions)	Date		Purchase Price			Elimination of Mortgage Note Receivable			Mortgage			Cash		Real		Other (3)			Square
		Acquired								Notes Payable Assumed (1)			Consideration (2)		Estate					Footage
	Real estate acquisitions
	Iowa	3/28/14		$	—		$	(40.0	)	$	—		$	—	$	40.2	$	(0.2	)	152,655
	Oklahoma	5/22/14		85.4			(81.2		)	—			4.2		85.4		—			200,000
	Texas	6/4/14		8.7			—			—			8.7		8.8		(0.1		)	48,048
	North Carolina	6/6/14		6.5			—			—			6.5		6.5		—			35,292
	Minnesota	7/28/14		19.8			—			(11.4		)	8.4		20.9		(1.0		)	60,476
	Florida	9/16/14		7.9			—			—			7.9		7.9		—			47,962
	Oklahoma	10/29/14		17.5			—			(6.8		)	10.7		17.9		(0.4		)	68,860
	Washington	12/1/14		22.7			—			—			22.7		18.9		3.8			60,161
				$	168.5		$	(121.2	)	$	(18.2	)	$	69.1	$	206.5	$	2.1		673,454
	______
	(1) The mortgage notes payable assumed in the acquisitions do not reflect the fair value adjustment totaling $1.4 million recorded by the Company upon acquisition (included in Other).
	(2) Cash consideration excludes non-real estate assets acquired and liabilities assumed in the acquisitions.
	(3) Includes intangibles recognized at acquisition and fair value adjustments on debt assumed.
	The following table summarizes the estimated fair values of the assets acquired and liabilities assumed in the real estate acquisitions for 2014 as of the acquisition date:
		Estimated Fair Value				Estimated Useful Life
		(In millions)				(In years)
	Building	181.7				11.5-39.0
	Land	12.7				—
	Intangibles:
	At-market lease intangibles	12.1				4.8-13.9
	Below-market lease intangibles	(0.4		)		3.8-6.5
	Above-market ground lease intangibles	(0.1		)		91.3
	Below-market ground lease intangibles	3.8				63.7
	Total intangibles	15.4
	Mortgage notes payable assumed, including fair value adjustments	(19.6		)
	Foreclosed mortgage note receivable	(40.0		)
	Elimination of mortgage note receivable upon acquisition	(81.2		)
	Other assets acquired	3
	Accounts payable, accrued liabilities and other liabilities assumed	(2.3		)
	Cash acquired	0.2
	Total cash paid (1)	$	69.9
	______
	(1) Total cash paid includes receivables acquired net of liabilities assumed in the acquisitions of approximately $0.8 million.
	2014 Noncontrolling Interest Purchase
	In April 2014, the Company purchased the outstanding 40% noncontrolling equity interest in a consolidated partnership that owns a medical office building and parking garage in Texas, which were developed by the partnership, for an aggregate purchase price and cash consideration of $8.2 million. The book value of the noncontrolling interest prior to the equity purchase was $1.6 million. The remaining $6.6 million was recorded as a decrease to additional paid-in capital on the Company's Consolidated Balance Sheets. The Company held a term loan that was secured by the property and was payable from the partnership. Upon acquisition of the noncontrolling interest, the term loan, which was previously eliminated in the Company's Consolidated Financial Statements, was extinguished.
	2013 Real Estate Acquisitions
	During 2013, the Company acquired the following properties:
	•	a 52,225 square foot medical office building in Tennessee for a purchase price and cash consideration of $16.2 million. The property was 100% leased to four tenants with expirations through 2021 and is adjacent to a 39,345 square foot medical office building the Company purchased in October 2012;
	•	a 42,627 square foot inpatient rehabilitation facility in Texas for a purchase price and cash consideration of $16.3 million. The property was 100% leased to one tenant that expires in 2033;
	•	a 205,573 square foot medical office building and garage in Indiana for a purchase price and cash consideration of $44.3 million. The property was 87% leased with expirations through 2029. The property is connected to and was 48% leased by St. Joseph's Medical Center, which is part of the CHE Trinity system, that opened in December 2009;
	•	an 80,153 square foot medical office building in Colorado for a purchase price of approximately $33.2 million, including cash consideration of $21.2 million and the assumption of debt of $12.0 million (excluding a $0.7 million fair value adjustment premium recorded upon acquisition). The mortgage note payable assumed by the Company bears a contractual interest rate of 6.17% and matures in 2027. The building was 100% leased with lease expirations through 2028. The property is connected to and was 71% leased by Poudre Valley Health System, which is part of the University of Colorado Health system;
	•	a 186,000 square foot orthopedic facility in Missouri for a purchase price of approximately $102.6 million. The Company funded the development of the facility through a construction mortgage loan of approximately $97.2 million that, upon acquisition, was eliminated in the Company's Consolidated Financial Statements. At the closing of the purchase, the outstanding loan balance was credited to the purchase price and the Company paid an additional $5.4 million in cash consideration. Subsequent to the acquisition, the Company funded an additional $6.5 million in 2013 and $2.3 million during 2014 to complete the development. The building was 100% leased to Mercy Health through 2027;
	•	an 81,956 square foot medical office building located in the state of Washington for a purchase price of $34.9 million. The property was 100% leased with lease expirations through 2020 and is adjacent to two hospital campuses and affiliated with Providence Health and Services. The Company assumed a mortgage note payable of $16.6 million (excluding a $0.5 million fair value adjustment premium recorded upon acquisition) on the property that bears interest at a rate of 6.01% and matures in 2036;
	•	a 70,138 square foot medical office building in Colorado for a purchase price and cash consideration of $21.6 million. The property was on the same campus as the 80,153 square foot medical office building the Company purchased in September 2013. The building was 83% leased to three tenants with lease expirations through 2026. The property is connected to and affiliated with the University of Colorado Health system;
	•	a 90,633 square foot medical office building in North Carolina for a purchase price of $20.1 million. The property was 100% leased with expirations through 2021 and is affiliated with CaroMont Health. The Company assumed a mortgage note payable of $11.0 million (excluding a $0.2 million fair value adjustment premium recorded upon acquisition) on the property that bears interest at a rate of 5.86% and matures in 2016;
	•	a 97,552 square foot medical office building located in Texas for a purchase price and cash consideration of $19.0 million. The property was 88% leased with expirations through 2026. The property is affiliated with and was 24% leased by Seton Healthcare; and
	•	a 34,068 square foot inpatient rehabilitation facility located in Colorado for a purchase price and cash consideration of $7.0 million. Concurrent with the closing on the acquisition, the Company executed a single-tenant net lease that expires in 2029 for 100% of the property. This transaction was accounted for as an asset acquisition.
	A summary of the Company’s 2013 acquisitions is shown in the table below:
	(Dollars in millions)	Date		Purchase Price			Elimination of Construction Mortgage Note Receivable			Mortgage			Cash		Real		Other (3)			Square
Acquired		Notes Payable Assumed(1)								Consideration (2)			Estate		Footage
Real estate acquisitions
Tennessee	1/29/13		$	16.2		$	—		$	—		$	16.2	$	15.7	$	0.5		52,225
Texas	4/8/13		16.3			—			—			16.3		16.3		—			42,627
Indiana	8/8/13		44.3			—			—			44.3		43.3		1			205,573
Colorado	9/27/13		33.2			—			(12.0		)	21.2		32.9		0.3			80,153
Missouri	9/27/13		102.6			(97.2		)	—			5.4		102.6		—			186,000
Washington	10/18/13		34.9			—			(16.6		)	18.3		35.4		(0.5		)	81,956
Colorado	10/24/13		21.6			—			—			21.6		21.7		(0.1		)	70,138
North Carolina	10/30/13		20.1			—			(11.0		)	9.1		20		0.1			90,633
Texas	12/16/13		19			—			—			19		19.1		(0.1		)	97,552
Colorado	12/16/13		7			—			—			7		7.1		(0.1		)	34,068
			$	315.2		$	(97.2	)	$	(39.6	)	$	178.4	$	314.1	$	1.1		940,925
______
(1) The mortgage notes payable assumed in the acquisitions do not reflect the fair value adjustments totaling $1.4 million recorded by the Company upon acquisition (included in Other).
(2) Cash consideration excludes non-real estate assets acquired and liabilities assumed in the acquisitions.
(3) Includes intangibles recognized at acquisition and fair value adjustments on debt assumed.
The following table summarizes the estimated fair values of the assets acquired and liabilities assumed in the real estate acquisitions for 2013 as of the acquisition date:
	Estimated				Estimated
	Fair Value				Useful Life
	(In millions)				(In years)
Buildings	$	280.2			7.0-39.0
Land	21.6				—
Personal property	0.3				1.9
Intangibles:
At-market lease intangibles	12				3.7-20.0
Above-market lease intangibles	2.9				2.3-16.3
Below-market lease intangibles	(0.4		)		0.5-7.4
Total intangibles	14.5
Mortgage notes payable assumed, including fair value adjustments	(41.0		)
Elimination of mortgage note receivable upon acquisition	(97.2		)
Other assets acquired	1.2
Accounts payable, accrued liabilities and other liabilities assumed	(1.9		)
Total cash paid (1)	$	177.7
______
(1) Total cash paid includes liabilities assumed net of receivables acquired in the acquisitions of $0.7 million.
2014 Real Estate Asset Dispositions
During 2014, the Company disposed of the following real estate assets:
•	a 52,608 square foot off-campus, medical office building located in Florida in which the Company had a $1.7 million net investment, including the impact of impairment charges recorded prior to the sale of approximately $3.3 million. The sales price was $1.8 million, comprised of $1.7 million in net cash proceeds and closing costs of $0.1 million. This property was previously classified as held for sale;
•	a 58,365 square foot off-campus, medical office building located in Texas in which the Company had a $4.1 million net investment, including the impact of impairment charges recorded prior to the sale of approximately $2.6 million. The sales price was $4.4 million, comprised of $4.2 million in net cash proceeds and closing costs of $0.2 million. This property was previously classified as held for sale;
•	a 31,026 square foot on-campus, medical office building located in Nevada in which the Company had a $4.9 million net investment. The sales price was approximately $2.3 million, comprised of net cash proceeds of approximately $0.2 million, a seller-financed mortgage note of $1.9 million, and closing costs of $0.2 million. The Company recognized a $2.8 million impairment on the disposal of this property that was not previously classified as held for sale;
•	two off-campus medical office buildings in Tennessee, totaling 32,204 square feet, in which the Company had an aggregate net investment of $3.2 million. The sales price for the buildings was approximately $3.1 million comprised of net cash proceeds of $2.9 million and closing costs of approximately $0.2 million. The Company recognized a $0.4 million impairment on the disposal, net of straight-line rent receivables which were written off. These properties were not previously classified as held for sale;
•	two off-campus medical office buildings in Texas, totaling 166,167 square feet, in which the Company had an aggregate net investment $12.1 million. The sales price and net cash proceeds for the buildings was approximately $21.5 million. The Company recognized a $9.2 million gain on the disposal, net of straight-line rent receivables which were written off. These properties were not previously classified as held for sale;
•	a 26,166 square foot off-campus, medical office building located in Missouri in which the Company had a $1.4 million net investment, including a $3.1 million impairment charge recorded in the second quarter of 2014 as a result of the pending sale. The sales price and net cash proceeds for the building was approximately $1.3 million. The Company recognized a $0.2 million impairment on the disposal, net of straight-line rent receivables which were written off. This property was previously classified as held for sale; and
•	a 110,000 square foot off-campus, medical office building located in Illinois in which the Company had a $0.8 million net investment, including the impact of impairment charges prior to the sale of $5.6 million. The sales price was $0.5 million and the Company recognized a $0.3 million impairment on the disposal. This property was previously classified as held for sale.
2014 Company-Financed Mortgage Notes
During 2014, the Company originated an $1.9 million seller-financed mortgage note receivable with the purchaser of a medical office building located in Nevada. See "2014 Real Estate Asset Dispositions" above for more information.
Also during 2014, two Company-financed mortgage notes receivable totaling $4.9 million were repaid.
A summary of the Company's 2014 dispositions are as follows:
(Dollars in millions)	Date		Sales Price			Closing Adjustments			Company-financed Mortgage			Net		Net Real		Other			Gain/			Square
	Disposed								Notes			Proceeds		Estate		(including			(Impairment)			Footage
														Investment		receivables)
Real estate dispositions
Florida (1)	4/11/14		$	1.8		$	(0.1	)	$	—		$	1.7	$	1.7	$	—		$	—		52,608
Texas (1)	4/23/14		4.4			(0.2		)	—			4.2		4.1		0.1			—			58,365
Nevada	9/12/14		2.3			(0.2		)	(1.9		)	0.2		4.9		—			(2.8		)	31,026
Tennessee (2)	11/14/14		3.1			(0.2		)	—			2.9		3.2		0.1			(0.4		)	32,204
Texas (2)	11/25/14		21.5			—			—			21.5		12.1		0.2			9.2			166,167
Missouri (1)	12/18/14		1.3			—			—			1.3		1.4		0.1			(0.2		)	26,166
Illinois (1)	12/29/14		0.5			—			—			0.5		0.8		—			(0.3		)	110,000
Total dispositions			34.9			(0.7		)	(1.9		)	32.3		28.2		0.5			5.5			476,536
Mortgage note repayments			—			—			4.9			4.9		—		—			—			—
			$	34.9		$	(0.7	)	$	3		$	37.2	$	28.2	$	0.5		$	5.5		476,536
______
(1) Previously included in assets held for sale.
(2) Includes two properties.
2013 Real Estate Asset Dispositions
During 2013, the Company disposed of the following real estate assets:
•	15.1 acres of land in Texas in which the Company had an aggregate net investment of approximately $8.1 million. The sales price was approximately $5.0 million, which included $1.1 million in net cash proceeds, the origination of a $3.7 million Company-financed mortgage note receivable and closing costs of $0.2 million. The Company recognized a $3.3 million impairment on the disposal;
•	a 17,696 square foot medical office building in Tennessee, in which the Company had an aggregate net investment of $0.4 million, including the impact of impairment charges prior to the sale of $1.3 million. The sales price of $0.6 million was funded by the Company under a mortgage note receivable. The approximate $0.2 million gain was recognized as payments on the mortgage note were made under the installment method and fully recognized in October 2013 when the note was repaid. The property was previously classified as held for sale;
•	an 8,000 square foot medical office building in Texas, in which the Company had an aggregate net investment of $0.9 million. The sales price was approximately $1.3 million comprised of $1.2 million in net cash proceeds and closing costs of $0.1 million. The Company recognized a $0.3 million gain on the disposal. The property was not previously classified as held for sale;
•	a 100,920 square foot medical office building in Texas. The Company had an aggregate net investment of $3.0 million in this property, including the impact of impairment charges prior to the sale of $6.8 million. The sales price was approximately $3.2 million comprised of $3.0 million in net cash proceeds and closing costs of $0.2 million. The Company recognized an immaterial gain on the disposal of this property that was previously classified as held for sale;
•	a 9,153 square foot medical office building and a 22,572 square foot medical office building, both in Iowa, in which the Company had an aggregate net investment of approximately $5.3 million. The total sales price and net cash proceeds for the two properties were $6.9 million. In connection with the sales, the Company repaid a mortgage note payable of $1.1 million and incurred debt extinguishment costs of $0.3 million. The Company recognized a $1.4 million aggregate gain on the disposal of the two properties, including the write-off of a straight-line rent receivable of $0.2 million. The properties were not previously classified as held for sale;
•	a 62,782 square foot inpatient rehabilitation facility in Florida pursuant to a purchase option exercise and in which the Company had an aggregate net investment of $7.4 million. The sales price was approximately $11.9 million comprised of $11.7 million in net cash proceeds and closing costs of $0.2 million. The Company recognized a $4.3 million gain on the disposal of this property that was previously classified as held for sale;
•	an 82,000 square foot inpatient rehabilitation facility in Alabama pursuant to a purchase option exercise and in which the Company had an aggregate net investment of $11.2 million. The sales price was approximately $17.5 million comprised of $17.4 million in net cash proceeds and closing costs of $0.1 million. The Company recognized a $6.2 million gain on the disposal of this property that was previously classified as held for sale;
•	a 76,324 square foot inpatient rehabilitation facility in Pennsylvania pursuant to a purchase option exercise in which the Company had an aggregate net investment of $12.2 million. The sales price was approximately $17.6 million comprised of $17.3 million in net cash proceeds and closing costs of $0.3 million. The Company recognized a $5.1 million gain on the disposal of this property. This property was not previously classified as held for sale;
•	a 79,560 square foot inpatient rehabilitation facility in Pennsylvania pursuant to a purchase option exercise in which the Company had an aggregate net investment of $12.6 million. The sales price was approximately $17.6 million comprised of $17.2 million in net cash proceeds and closing costs of $0.4 million. The Company recognized a $4.6 million gain on the disposal of this property. This property was not previously classified as held for sale;
•	a 14,322 square foot medical office building in Florida in which the Company had an aggregate net investment of $0.8 million, including the impact of impairment charges prior to the sale of $0.1 million. The sales price and net cash proceeds received were approximately $0.8 million. This property was previously classified as held for sale;
•	a 57,580 square foot medical office building in North Carolina in which the Company had an aggregate net investment of $13.4 million. The sales price and net cash proceeds received were approximately $17.6 million. The Company recorded a $2.1 million gain on the disposal, net of approximately $2.1 million of straight-line rent receivables, prepaid ground lease payments and above-market lease intangibles which were written off. This property was not previously classified as held for sale; and
•	a 10,593 square foot medical office building in Alabama in which the Company had an aggregate net investment of $1.4 million. The sales price and net cash proceeds received were approximately $1.9 million. The Company recorded a $0.5 million gain on the disposal of this property that was previously classified as held for sale.
A summary of the Company’s 2013 dispositions follows:
(Dollars in millions)	Date		Sales Price			Closing Adjustments			Company-financed Mortgage			Net		Net Real		Other			Gain/			Square
	Disposed								Notes			Proceeds		Estate		(including			(Impairment)			Footage
														Investment		receivables)
Real estate dispositions
Texas (land)	3/25/13		$	5		$	(0.2	)	$	(3.7	)	$	1.1	$	8.1	$	—		$	(3.3	)	—
Tennessee (1)(4)	4/30/13		0.6			—			(0.6		)	—		0.4		—			0.2			17,696
Texas	5/15/13		1.3			(0.1		)	—			1.2		0.9		—			0.3			8,000
Texas (1)	5/24/13		3.2			(0.2		)	—			3		3		—			—			100,920
Iowa (2) (3)	6/3/13		6.9			—			—			6.9		5.3		0.2			1.4			31,725
Florida (1)	7/15/13		11.9			(0.2		)	—			11.7		7.4		—			4.3			62,782
Alabama (1)	7/31/13		17.5			(0.1		)	—			17.4		11.2		—			6.2			82,000
Pennsylvania	9/30/13		17.6			(0.3		)	—			17.3		12.2		—			5.1			76,324
Pennsylvania	9/30/13		17.6			(0.4		)	—			17.2		12.6		—			4.6			79,560
Florida (1)	10/31/13		0.8			—			—			0.8		0.8		—			—			14,322
North Carolina	12/5/13		17.6			—			—			17.6		13.4		2.1			2.1			57,580
Alabama (1)	12/31/13		1.9			—			—			1.9		1.4		—			0.5			10,593
Total dispositions			101.9			(1.5		)	(4.3		)	96.1		76.7		2.3			21.4			541,502
Mortgage note repayments			—			—			0.6			0.6		—		—			—			—
			$	101.9		$	(1.5	)	$	(3.7	)	$	96.7	$	76.7	$	2.3		$	21.4		541,502
______
-1	Previously included in assets held for sale.
-2	Includes two properties.
-3	The Company repaid a mortgage note payable of $1.1 million upon sale and incurred debt extinguishment costs of $0.3 million.
-4	The Company-financed mortgage note receivable was repaid in October 2013.
2013 Company-Financed Mortgage Notes
During 2013, the Company originated the following Company-financed mortgage notes receivable in disposal transactions discussed in the "2013 Real Estate Asset Dispositions" section above:
•	$3.7 million with the purchaser of the 15.1 acres of land located in Texas that were sold in March 2013. The mortgage note receivable had an interest rate of 5.0% in the first year and 6.0% in the second year and was to mature in March 2015. This note was repaid in September 2014; and
•	$0.6 million with the purchaser of a medical office building in Tennessee that was sold in April 2013 that was to mature on April 30, 2018 and had an interest rate of 7.5% per annum. This note was repaid in October 2013.
2013 Noncontrolling Interest Contribution
During 2013, the Company received $1.8 million in capital contributions from a 40% noncontrolling interest holder in a partnership that owned a medical office building and parking garage in Texas. The partnership (HRP MAC III, LLC), in which the Company held a 60% majority controlling interest, was the borrower under a term loan from the Company of approximately $14.2 million, secured by the real estate assets, that matures in January 2016 and bears interest at 5.35%. These buildings, which were constructed by the Company, were completed in July 2012 and were previously subject to a construction mortgage note totaling $13.7 million. The Company's equity in and term loan to the partnership were eliminated in consolidation.
2015 Acquisition
In January 2015, the Company acquired a 110,679 square foot medical office building in California for a purchase price and cash consideration of $39.3 million. The property is located adjacent to two hospital campuses, one affiliated with Kaiser Permanente, a 106-bed hospital, and another affiliated with Washington Hospital Healthcare System, a 353-bed hospital. Upon acquisition, this property was 97% leased, with leases to the two hospitals comprising 59% of the rentable square footage.

Mortgage_Notes_Receivable

Mortgage Notes Receivable	12 Months Ended
	Dec. 31, 2014
Receivables [Abstract]
Mortgage Notes Receivable	Mortgage Notes Receivable
	The Company’s mortgage note receivable is classified as held-for-investment based on management’s intent and ability to hold the loans until maturity. As such, the loans are carried at amortized cost. Also, the Company’s mortgage note receivable is secured by an existing building. Approximately $1.2 million and $58.7 million, respectively, were funded on existing construction mortgage loans during the years ended December 31, 2014 and 2013. A summary of the Company’s mortgage notes receivable for the years ended December 31, 2014 and 2013 is shown in the table below:
								Balance as of December 31,
	State	Property Type (1)	Face Amount		Interest Rate		Maturity Date	2014		2013
	(dollars in thousands)
	Construction mortgage notes:
	Oklahoma	MOB	$	94,889	7.72	%	9/30/14	$	—	$	79,969
	Total construction mortgage notes							—		79,969
	Other mortgage notes:
	Iowa	Other	40,000		7.7	%	1/10/14	—		39,973
	Florida	MOB	3,750		7.5	%	4/10/15	—		3,750
	Texas	Land	3,666		5.00%-6.00%		3/25/15	—		1,855
	Nevada	MOB	1,900		6.5	%	9/30/17	1,900		—
	Total other mortgage notes							1,900		45,578
	Total mortgage notes receivable							$	1,900	$	125,547
	______
	(1) MOB - Medical office building.
	Construction Mortgage Note Fundings
	In May 2014, the Company acquired a medical office building in Oklahoma for $85.4 million, including the elimination of the construction mortgage note receivable totaling $81.2 million and cash consideration of approximately $4.2 million. The building is 100% leased to Mercy Health. The Company provided $1.2 million in fundings toward the facility under a construction mortgage note during 2014. See Note 4 for details regarding the Company's acquisition.
	Mortgage Note Receivable Default
	As of December 31, 2013, the Company held a $40.0 million loan that was secured by a first position mortgage on a multi-tenant office building in Iowa that is 93% leased. Interest only payments at a fixed rate of 7.7% were due, and paid, through the maturity of the loan on January 10, 2014. The borrower did not make the balloon principal payment at maturity. The borrower transfered its interest in the property to the Company in satisfaction of the debt. See Note 4 for details regarding the Company's acquisition.

Discontinued_Operations

Discontinued Operations	12 Months Ended
	Dec. 31, 2014
Discontinued Operations and Disposal Groups [Abstract]
Discontinued Operations	Discontinued Operations
	Assets and liabilities of properties sold or classified as held for sale on the Company’s Consolidated Balance Sheets, and the results of operations of such properties are included in discontinued operations on the Company’s Consolidated Statements of Operations for all periods presented. As of December 31, 2014 and 2013, the Company had two and three properties, respectively, classified as held for sale.
	The tables below reflect the assets and liabilities of the properties classified as held for sale and discontinued operations as of December 31, 2014 and 2013 and the results of operations of the properties included in discontinued operations on the Company’s Consolidated Statements of Operations for the years ended December 31, 2014, 2013 and 2012.
		December 31,
	(Dollars in thousands)	2014			2013
	Balance Sheet data (as of the period ended):
	Land	$	422		$	1,578
	Buildings, improvements and lease intangibles	12,822			15,400
	Personal property	13			—
		13,257			16,978
	Accumulated depreciation	(4,464		)	(10,211		)
	Assets held for sale, net	8,793			6,767
	Other assets, net (including receivables)	353			85
	Assets of discontinued operations, net	353			85
	Assets held for sale and discontinued operations, net	$	9,146		$	6,852
	Accounts payable and accrued liabilities	$	86		$	1,091
	Other liabilities	286			21
	Liabilities of discontinued operations	$	372		$	1,112
		Year Ended December 31,
	(Dollars in thousands, except per share data)	2014			2013			2012
	Statements of Operations data:
	Revenues (1)
	Rental income	$	5,660		$	14,202		$	24,290
	Other operating	4			9			69
		5,664			14,211			24,359
	Expenses (2)
	Property operating	3,126			4,830			6,894
	General and administrative	19			26			33
	Depreciation	1,551			3,794			6,888
	Amortization	—			63			147
	Bad debt, net of recoveries	3			13			10
		4,699			8,726			13,972
	Other Income (Expense) (3)
	Loss on extinguishment of debt	—			(270		)	—
	Interest expense	—			(40		)	(97		)
	Interest and other income, net	2			71			171
		2			(239		)	74
	Income from Discontinued Operations	967			5,246			10,461
	Impairments (4)	(12,029		)	(9,889		)	(14,908		)
	Gain on sales of real estate properties (5)	9,283			24,718			10,874
	Income (Loss) from Discontinued Operations	$	(1,779	)	$	20,075		$	6,427
	Income (Loss) from Discontinued Operations per Common Share - Basic	$	(0.02	)	$	0.22		$	0.08
	Income (Loss) from Discontinued Operations per Common Share - Diluted	$	(0.02	)	$	0.22		$	0.08
	______
	-1	Total revenues for the years ended December 31, 2014, 2013 and 2012 included $4.3 million, $12.6 million and $22.2 million, respectively, related to properties sold; and $1.4 million, $1.6 million and $2.2 million, respectively, related to two properties held for sale as of December 31, 2014.
	-2	Total expenses for the years ended December 31, 2014, 2013 and 2012 included $4.7 million, $8.7 million and $13.5 million, respectively, related to properties sold; and for the year ended December 31, 2012 included $0.5 million related to two properties held for sale as of December 31, 2014.
	-3	Other income (expense) for the years ended December 31, 2014, 2013, and 2012 included income (expense) related to properties sold.
	-4	Impairments for the year ended December 31, 2014 included $3.7 million in connection with the sale of three properties and $8.3 million on two properties in held for sale and two properties there were reclassified to held for sale during 2014. All four properties of these were subsequently sold; December 31, 2013 included the following: $3.3 million related to the sale of a land parcel; $0.4 million related to two properties classified as held for sale and subsequently sold for a gain; and $6.2 million related to three properties held for sale; and December 31, 2012 included $11.1 million related to 12 properties sold and $3.8 million related to one properties held for sale.
	-5	Gain on sales of real estate properties for the years ended December 31, 2014, 2013 and 2012 included gains on the sale of three, 12 and seven properties, respectively.

Impairment_Charges

Impairment Charges	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Impairment Charges	Impairment Charges
	An asset is impaired when undiscounted cash flows expected to be generated by the asset are less than the carrying value of the asset. The Company must assess the potential for impairment of its long-lived assets, including real estate properties, whenever events occur or there is a change in circumstances, such as the sale of a property or the decision to sell a property, that indicate that the recorded value might not be fully recoverable.
	The Company recorded impairment charges on properties sold or classified as held for sale, which are included in discontinued operations, for the years ended December 31, 2014, 2013 and 2012 totaling $12.0 million, $9.9 million and $14.9 million, respectively. Both level 1 and level 3 fair value techniques were used to derive these impairment charges. These impairment charges are discussed in more detail in Note 4.

Other_Assets

Other Assets	12 Months Ended
	Dec. 31, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Other Assets	Other Assets
	Other assets consist primarily of straight-line rent receivables, prepaids, intangible assets, deferred financing costs and receivables. Items included in "Other assets, net" on the Company’s Consolidated Balance Sheets as of December 31, 2014 and 2013 are detailed in the table below:
		December 31,
	(Dollars in millions)	2014			2013
	Prepaid assets	$	61.4		$	55.3
	Straight-line rent receivables	52.6			42.2
	Above-market intangible assets, net	17.3			14.4
	Additional long-lived assets, net	14.4			15.9
	Ground lease modification, net	11.7			—
	Deferred financing costs, net	9.9			11.7
	Accounts receivable	8.7			7
	Allowance for uncollectible accounts	(0.5		)	(0.5		)
	Goodwill	3.5			3.5
	Customer relationship intangible assets, net	1.9			2
	Other	4.4			2
		$	185.3		$	153.5
	Ground Lease Modification, net
	In May 2014, the Company modified the ground leases and property operating agreements of five on-campus medical office buildings, totaling 424,000 square feet, associated with the sponsoring health system.  The Company paid the health system $12.0 million to modify these agreements and eliminate exercisable purchase options that would have resulted in a purchase price below estimated fair market value. This modification payment will be amortized over the remaining term of the in-place ground leases on a straight-line basis.

Intangible_Assets_and_Liabilit

Intangible Assets and Liabilities	12 Months Ended
	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets and Liabilities	Intangible Assets and Liabilities
	The Company has several types of intangible assets and liabilities included in its Consolidated Balance Sheets, including goodwill, deferred financing costs, above-, below-, and at-market lease intangibles, and customer relationship intangibles. The Company’s intangible assets and liabilities as of December 31, 2014 and 2013 consisted of the following:
		Gross Balance at December 31,						Accumulated Amortization at December 31,						Weighted	Balance Sheet
														Avg. Remaining Life	Classification
	(Dollars in millions)	2014			2013			2014			2013			(Years)
	Goodwill	$	3.5		$	3.5		$	—		$	—		N/A	Other assets
	Deferred financing costs	17.6			16.4			7.7			4.7			4.3	Other assets
	Above-market lease intangibles	21.1			17.3			3.8			2.9			52.7	Other assets
	Customer relationship intangibles	2.6			2.6			0.7			0.6			28.6	Other assets
	Below-market lease intangibles	(9.2		)	(8.9		)	(4.8		)	(4.1		)	14.3	Other liabilities
	At-market lease intangibles	130.7			118.6			86.9			76.2			7.2	Real estate properties
		$	166.3		$	149.5		$	94.3		$	80.3		17
	The following table represents expected amortization of the Company’s intangible assets and liabilities, in place as of December 31, 2014:
	(Dollars in millions)	Future Amortization of Intangibles, net
	2015	$	12.4
	2016	$	11.4
	2017	$	8.3
	2018	$	6.5
	2019	$	4.9

Notes_and_Bonds_Payable

Notes and Bonds Payable	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Notes and Bonds Payable	Notes and Bonds Payable
	The table below details the Company’s notes and bonds payable.
		December 31,						Maturity		Contractual			Principal		Interest
	(Dollars in thousands)	2014			2013			Dates		Interest Rates			Payments		Payments
	Unsecured Credit Facility	$	85,000		$	238,000		17-Apr		LIBOR + 1.40%			At maturity		Quarterly
	Unsecured Term Loan Facility	200,000			—			19-Feb		LIBOR + 1.45%			At maturity		Quarterly
	Senior Notes due 2017, net of discount	299,308			299,008			17-Jan		6.5	%		At maturity		Semi-Annual
	Senior Notes due 2021, net of discount	397,864			397,578			21-Jan		5.75	%		At maturity		Semi-Annual
	Senior Notes due 2023, net of discount	248,253			248,077			23-Apr		3.75	%		At maturity		Semi-Annual
	Mortgage notes payable, net of discounts and including premiums	173,267			165,796			5/15-5/40		5.00%-7.63%			Monthly		Monthly
		$	1,403,692		$	1,348,459
	The Company’s various debt agreements contain certain representations, warranties, and financial and other covenants customary in such loan agreements. Among other things, these provisions require the Company to maintain certain financial ratios and minimum tangible net worth and impose certain limits on the Company’s ability to incur indebtedness and create liens or encumbrances. As of December 31, 2014, the Company was in compliance with its financial covenant provisions under its various debt instruments.
	Unsecured Credit Facility due 2017
	On October 14, 2011, the Company entered into a $700.0 million unsecured credit facility ("Unsecured Credit Facility") with a syndicate of 17 lenders. On February 15, 2013, the Company amended the facility to extend the original maturity date to April 14, 2017. The amendment also provides the Company with two six-month extension options that could extend the maturity date to April 14, 2018. Each option is subject to an extension fee of 0.075% of the aggregate commitments. Amounts outstanding under the Unsecured Credit Facility bear interest at LIBOR plus an applicable margin rate. The margin rate, which depends on the Company's credit ratings, ranges from 0.95% to 1.75% (1.4% as of December 31, 2014). In addition, the Company pays a facility fee per annum on the aggregate amount of commitments ranging from 0.15% to 0.35% (0.30% as of December 31, 2014). In connection with the amendment, the Company paid up-front fees to the lenders of approximately $2.7 million, which will be amortized over the term of the facility. The Company wrote-off certain unamortized deferred financing costs of the original facility of approximately $0.3 million upon execution of the amendment. As of December 31, 2014, the Company had $85.0 million outstanding under the Unsecured Credit Facility with a weighted average interest rate of approximately 1.6% and a remaining borrowing capacity of approximately $615.0 million.
	Unsecured Term Loan Facility due 2019
	In February 2014, the Company entered into a $200.0 million unsecured term loan facility ("Unsecured Term Loan due 2019") with a syndicate of nine lenders that matures on February 26, 2019. The Unsecured Term Loan due 2019 bears interest at a rate equal to (x) LIBOR plus (y) a margin ranging from 1.00% to 1.95% (1.45% as of December 31, 2014) based upon the Company's unsecured debt ratings. Payments under the Unsecured Term Loan due 2019 are interest only, with the full amount of the principal due at maturity. The Unsecured Term Loan due 2019 may be prepaid at any time, without penalty. The proceeds from the Unsecured Term Loan due 2019 were used by the Company to repay borrowings on its Unsecured Credit Facility. The Unsecured Term Loan due 2019 has various financial covenant provisions that are required to be met on a quarterly and annual basis that are equivalent to those of the Unsecured Credit Facility. As of December 31, 2014, the Company had $200.0 million outstanding under the Unsecured Term Loan due 2019 with a weighted average interest rate of approximately 1.6%.
	Senior Notes due 2017
	On December 4, 2009, the Company publicly issued $300.0 million of unsecured senior notes due 2017 (the "Senior Notes due 2017"). The Senior Notes due 2017 bear interest at 6.50%, payable semi-annually on January 17 and July 17, and are due on January 17, 2017, unless redeemed earlier by the Company. The notes were issued at a discount of approximately $2.0 million, which yielded a 6.618% interest rate per annum upon issuance. For each of the years ended December 31, 2014, 2013 and 2012, the Company amortized approximately $0.3 million of the discount which is included in interest expense on the Company’s Consolidated Statements of Operations.
	The Company's board of directors has authorized the repurchase of up to $50 million of the Company's Senior Notes due 2017 in open market transactions from time to time. The Company currently has no specific timeframe within which to purchase these notes and has no obligation to repurchase any notes prior to maturity.
	The following table reconciles the balance of the Senior Notes due 2017 on the Company’s Consolidated Balance Sheets as of December 31, 2014 and 2013.
		December 31,
	(Dollars in thousands)	2014			2013
	Senior Notes due 2017 face value	$	300,000		$	300,000
	Unaccreted discount	(692		)	(992		)
	Senior Notes due 2017 carrying amount	$	299,308		$	299,008
	Senior Notes due 2021
	On December 13, 2010, the Company publicly issued $400.0 million of unsecured senior notes due 2021 (the "Senior Notes due 2021"). The Senior Notes due 2021 bear interest at 5.75%, payable semi-annually on January 15 and July 15, and are due on January 15, 2021, unless redeemed earlier by the Company. The notes were issued at a discount of approximately $3.2 million, which yielded a 5.855% interest rate per annum upon issuance. For each of the years ended December 31, 2014, 2013 and 2012, the Company amortized approximately $0.3 million of the discount which is included in interest expense on the Company’s Consolidated Statement of Operations. The following table reconciles the balance of the Senior Notes due 2021 on the Company’s Consolidated Balance Sheets as of December 31, 2014 and 2013.
		December 31,
	(Dollars in thousands)	2014			2013
	Senior Notes due 2021 face value	$	400,000		$	400,000
	Unaccreted discount	(2,136		)	(2,422		)
	Senior Notes due 2021 carrying amount	$	397,864		$	397,578
	Senior Notes due 2023
	On March 26, 2013, the Company publicly issued $250.0 million of unsecured senior notes due 2023 (the "Senior Notes due 2023"). The Senior Notes due 2023 bear interest at 3.75%, payable semi-annually on April 15 and October 15, beginning October 15, 2013, and are due on April 15, 2023, unless redeemed earlier by the Company. The notes were issued at a discount of approximately $2.1 million, which yielded a 3.849% interest rate per annum upon issuance. For the years ended December 31, 2014 and 2013, the Company amortized approximately $0.2 million and $0.1 million, respectively, of the discount which is included in interest expense on the Company’s Consolidated Statement of Operations. The following table reconciles the balance of the Senior Notes due 2023 on the Company’s Consolidated Balance Sheets as of December 31, 2014.
		December 31,
	(Dollars in thousands)	2014			2013
	Senior Notes due 2023 face value	$	250,000		$	250,000
	Unaccreted discount	(1,747		)	(1,923		)
	Senior Notes due 2023 carrying amount	$	248,253		$	248,077
	Mortgage Notes Payable
	The following table reconciles the Company’s aggregate mortgage notes principal balance with the Company’s Consolidated Balance Sheets as of December 31, 2014 and 2013. For the years ended December 31, 2014, 2013 and 2012, the Company amortized approximately $1.1 million, $1.2 million and $1.0 million of the discount and $1.0 million, $0.7 million, and $0.7 million of the premium, respectively, on the mortgage notes payable which is included in interest expense on the Company’s Consolidated Statement of Operations.
		December 31,
	(Dollars in thousands)	2014			2013
	Mortgage notes payable principal balance	$	172,530		$	166,684
	Unamortized premium	3,205			2,708
	Unaccreted discount	(2,468		)	(3,596		)
	Mortgage notes payable carrying amount	$	173,267		$	165,796
	The following table details the Company’s mortgage notes payable, with related collateral.
		Original Balance			Effective			Maturity		Collateral		Principal and Interest			Investment in Collateral at December 31,		Balance at December 31,
					Interest			Date		-22		Payments (20)
					Rate
	(Dollars in millions)				-21										2014		2014		2013
	Life Insurance Co.	$	4.7		7.77	%		17-Jan		MOB		Monthly/20-yr amort.			$	12.1	$	0.9	$	1.2
	Commercial Bank	1.8			5.55	%		30-Oct		OTH		Monthly/27-yr amort.			7.9		1.5		1.5
	Life Insurance Co.	15.1			5.49	%		16-Jan		MOB		Monthly/10-yr amort.			36.1		11.9		12.3
	Commercial Bank (1)	17.4			6.48	%		15-May		MOB		Monthly/10-yr amort.			20.2		14.8		14.7
	Commercial Bank (2)	12			6.11	%		15-Jul		2 MOBs		Monthly/10-yr amort.			19.4		10.1		10
	Commercial Bank (3)	15.2			7.65	%		20-Jul		MOB		(19	)		20.2		12.7		12.7
	Commercial Bank (4)	12.9			6.43	%		21-Feb		MOB		Monthly/12-yr amort.			20.7		11		11.1
	Life Insurance Co.	7			5.53	%		18-Jan		MOB		Monthly/15-yr amort.			14.9		1.9		2.5
	Investment Co.	4.6			5.25	%		15-Sep		MOB		Monthly/10-yr amort.			6.5		4.1		4.2
	Life Insurance Co. (5)	13.9			4.7	%		16-Jan		MOB		Monthly/25-yr amort.			26.7		11		11.5
	Life Insurance Co. (6)	21.5			4.7	%		15-Aug		MOB		Monthly/25-yr amort.			41.5		16.6		17.4
	Insurance Co. (7)	7.3			5.1	%		18-Dec		MOB		Monthly/25-yr amort.			13.7		6.8		7
Commercial Bank (8)	8.1			4.54	%		16-Aug		MOB		Monthly/10-yr amort.			15.7		7.5		7.6
Life Insurance Co. (9)	5.3			4.06	%		14-Nov		MOB		Monthly/25-yr amort.			—		—		4.3
Life Insurance Co. (10)	3.1			4.06	%		14-Nov		MOB		Monthly/25-yr amort.			—		—		2.5
Life Insurance Co. (11)	7.9			4	%		20-Aug		MOB		Monthly/15-yr amort.			20.7		4		4.6
Commercial Bank (12)	15			5.25	%		27-Apr		MOB		Monthly/20-yr amort			33.4		11.9		12.5
Commercial Bank (13)	18.3			5	%		16-Dec		MOB		Monthly/30-yr amort			33.6		16.5		17
Commercial Bank (14)	13.1			5	%		16-Apr		MOB		Monthly/25-yr amort			20.1		10.7		11.2
Life Insurance Co. (15)	7.3			4.86	%		20-Aug		MOB		Monthly/27-yr amort			17.8		7.1		—
Municipal Government (16) (17)	11.9			4.79	%		-18		MOB		Semi-Annual (18)			20.9		12.3		—
														$	402.1	$	173.3	$	165.8
______
-1	The unaccreted portion of a $2.7 million discount recorded on this note upon acquisition is included in the balance above.
-2	The unaccreted portion of a $2.1 million discount recorded on this note upon acquisition is included in the balance above.
-3	The unaccreted portion of a $2.4 million discount recorded on this note upon acquisition is included in the balance above.
-4	The unaccreted portion of a $1.0 million discount recorded on this note upon acquisition is included in the balance above.
-5	The unamortized portion of a $0.3 million premium recorded on this note upon acquisition is included in the balance above.
-6	The unamortized portion of a $0.4 million premium recorded on this note upon acquisition is included in the balance above.
-7	The unamortized portion of the $0.6 million premium recorded on this note upon acquisition is included in the balance above.
-8	The unamortized portion of the $0.5 million premium recorded on this note upon acquisition is included in the balance above.
-9	Balance consists of two notes secured by the same building. The company repaid these notes in October 2014.
-10	The company repaid this mortgage note in October 2014.
-11	The unamortized portion of the $0.3 million premium recorded on this note upon acquisition is included in the balance above.
-12	The unamortized portion of the $0.7 million premium recorded on this note upon acquisition is included in the balance above.
-13	The unamortized portion of the $0.5 million premium recorded on this note upon acquisition is included in the balance above.
-14	The unamortized portion of the $0.2 million premium recorded on this note upon acquisition is included in the balance above.
-15	The unamortized portion of the $0.4 million premium recorded on this note upon acquisition is included in the balance above.
-16	Balance consists of four notes secured by the same building.
-17	The unamortized portion of the $1.0 million premium recorded on the four notes upon acquisition is included in the balance above.
-18	These four mortgage notes payable are series municipal bonds that have maturity dates ranging from from May 2017 to May 2040. The note payable with the earliest maturity date will require principal and interest payments while the remaining notes payable will require interest only payments. One of the notes payable matures in May 2017 and the remaining three have future maturity dates but allow repayment in May 2020 without penalty. The Company intends on repaying all three notes payable at that time.
-19	Payable in monthly installments of interest only for 24 months and then installments of principal and interest based on an 11-year amortization with the final payment due at maturity.
-20	Payable in monthly installments of principal and interest with the final payment due at maturity (unless otherwise noted).
-21	The contractual interest rates for the 22 outstanding mortgage notes ranged from 5.0% to 7.6% as of December 31, 2014.
-22	MOB-Medical office building; OTH-Other.
Subsequent Mortgage Note Payable Repayment
In February 2015, the Company repaid in full a secured loan from Wells Fargo Commercial Mortgage bearing an interest rate of 5.45% consisting of outstanding principal of $15.0 million and accrued interest as of the redemption date of $0.1 million.
Other Long-Term Debt Information
Future maturities of the Company’s notes and bonds payable as of December 31, 2014 were as follows:
(Dollars in thousands)	Principal			Net Accretion/				Notes and Bonds Payable				%
	Maturities			Amortization (1)
2015	$	50,826		$	(624	)		$	50,202			3.6	%
2016	58,698			(473		)		58,225				4.1	%
2017	388,181			(473		)		387,708				27.6	%
2018	8,420			(496		)		7,924				0.6	%
2019	202,633			(636		)		201,997				14.4	%
2020 and thereafter	698,772			(1,136		)		697,636				49.7	%
	$	1,407,530		$	(3,838	)		$	1,403,692			100	%
______
-1	Includes discount accretion and premium amortization related to the Company’s Senior Notes due 2017, Senior Notes due 2021, Senior Notes due 2023, and 17 mortgage notes payable.

Stockholders_Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2014
Equity [Abstract]
Stockholders' Equity	Stockholders’ Equity
	Common Stock
	The Company had no preferred shares outstanding and had common shares outstanding for the three years ended December 31, 2014 as follows:
		Year Ended December 31,
		2014			2013			2012
	Balance, beginning of year	95,924,339			87,514,336			77,843,883
	Issuance of common stock	3,073,445			8,293,369			9,275,895
	Non-vested stock-based awards, net of withheld shares and forfeitures	(169,686	)		116,634			394,558
	Balance, end of year	98,828,098			95,924,339			87,514,336
	Restricted Stock Vesting
	The Company's Chairman and Chief Executive Officer, David R. Emery, has received multiple grants of restricted stock in prior years, 838,886 of which vested by their terms on December 31, 2014. Mr. Emery surrendered 351,913 of these shares upon vesting to satisfy the Company's minimum income tax withholding requirement. Together with his other holdings, Mr. Emery will continue to retain approximately 784,669 shares of the Company's common stock, 87,779 of which will continue to be restricted and subject to future vesting requirements.
	Equity Offering
	On July 19, 2013, the Company issued 3,000,000 shares of common stock, par value $0.01 per share, at $26.13 per share in an underwritten public offering pursuant to the Company's existing effective registration statement. The net proceeds of the offering, after underwriting discounts, commissions and offering expenses, were approximately $78.3 million.
	On September 28, 2012, the Company sold 9,200,000 shares of common stock at a gross price of $23.87 per share (net price of $22.85 per share) in an underwritten public offering pursuant to the Company's existing effective registration statement. The net proceeds of the offering, after underwriting discounts and commissions and estimated offering expenses, were approximately $201.1 million.
	At-The-Market Equity Offering Program
	The Company has in place an at-the-market equity offering program to sell shares of the Company’s common stock from time to time in at-the-market sales transactions. The following table details the shares sold under this program.
				Shares Sold			Sales Price Per Share		Net Proceeds
									(in millions)
	2014	2,099,380		3,009,761			$24.35 - $27.53		$	75.7
	2013	5,207,871		5,207,871			$24.19 - $30.49		$	140.6
	As of December 31, 2014, there were 2,381,639 authorized shares remaining available to be sold under the Company's existing sales agreements. In January 2015, the Company sold 531,153 shares of common stock, generating $14.9 million in net proceeds.
	Dividends Declared
	During 2014, the Company declared and paid common stock dividends aggregating $1.20 per share ($0.30 per share per quarter).
	On February 3, 2015, the Company declared a quarterly common stock dividend in the amount of $0.30 per share payable on February 27, 2015 to stockholders of record on February 17, 2015.
	Authorization to Repurchase Common Stock
	The Company’s Board of Directors has authorized management to repurchase up to 3,000,000 shares of the Company’s common stock. As of December 31, 2014, the Company had not repurchased any shares under this authorization. The Company may elect, from time to time, to repurchase shares either when market conditions are appropriate or as a means to reinvest excess cash flows. Such purchases, if any, may be made either in the open market or through privately negotiated transactions.
	Noncontrolling Interest Transfers
	The following schedule discloses the effects of changes in the Company's ownership interest in its less-than-wholly-owned subsidiary on the Company's stockholders' equity:
			Year Ended December 31,
	(Dollars in thousands)		2014				2013				2012
	Net income attributable to common stockholders		$	31,887			$	6,946			$	5,465
	Transfers to noncontrolling interest:
	Net decrease in the Company's additional paid-in capital for purchase of subsidiary partnership interest		(6,577		)		—				—
	Net transfers to the noncontrolling interest		(6,577		)		—				—
	Change to the Company's total stockholders' equity from net income attributable to common stockholders and transfers to noncontrolling interest		$	25,310			$	6,946			$	5,465
	Accumulated Other Comprehensive Income (Loss)
	During the year ended December 31, 2014, the Company recorded an increase to future benefit obligations related to its pension plan of $2.6 million, resulting in an increase to Other liabilities and an offsetting increase to Accumulated other comprehensive income (loss) which is included in Stockholders' equity on the Consolidated Balance Sheets. During the year ended December 31, 2013, the Company had recorded a reduction to future benefit obligations related to its pension plan of $2.1 million, resulting in a decrease to Other liabilities and an offsetting decrease to Accumulated other comprehensive income (loss) which is included in Stockholders' equity on the Consolidated Balance Sheets.
	The following table represents the amounts reclassified out of Accumulated other comprehensive income (loss) related to the Company's pension plan during the years ended December 31, 2014 and 2013:
		Year Ended December 31,
	(Dollars in thousands)	2014				2013
	Beginning balance	$	51			$	(2,092	)
	Other comprehensive income (loss) before reclassifications	(1,850		)		1,952
	Amounts reclassified from accumulated other comprehensive income (loss)	(720		)		191
	Net current-period other comprehensive income (loss)	(2,570		)		2,143
	Ending balance	$	(2,519	)		$	51
	The following table represents the details regarding the reclassifications from Accumulated other comprehensive income (loss) related to the Company's pension plan during the years ended December 31, 2014:
	Details about accumulated other comprehensive income (loss) components		Amount reclassified from accumulated other comprehensive income (loss)				Affected line item in the statement where net income is presented
	(Dollars in thousands)
	Prior service costs		$	(1,189	)		General and administrative expenses
	Actuarial loss		469				General and administrative expenses
			$	(720	)

Benefit_Plans

Benefit Plans	12 Months Ended
	Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]
Benefit Plans	Benefit Plans
	Executive Retirement Plan
	The Company has an Executive Retirement Plan under which three founding officers may receive pension benefits upon normal retirement (defined to be when the officer reaches age 65 and has completed five years of service with the Company) at an amount equal to 60% of the officer’s final average earnings (defined as the average of the executive’s highest three years’ earnings) plus 6% of final average earnings multiplied by the years of service after age 60 (but not more than five years), less 100% of certain other retirement benefits received by the officer to be paid either in lump sum or in monthly installments over a period not to exceed the greater of the life of the retired officer or his surviving spouse.
	In December 2008, the Company froze the maximum annual benefits payable to a single participant under the plan at $0.9 million, plus cost of living increases, which resulted in a curtailment of benefits under the retirement plan for the Company’s chief executive officer. In 2008, the officers under the plan elected the manner in which they would receive retirement benefits upon retirement. The Company’s chief executive officer agreed to receive his retirement benefits under the plan in installment payments upon retirement, rather than in a lump sum. Of the two remaining officers in the plan, one has elected to receive benefits in monthly installments and one has elected a lump-sum payment upon retirement.
	As of December 31, 2014, only the Company’s chief executive officer was eligible to retire under the plan. Upon retirement, the chief executive officer will be paid annual installments of approximately $0.9 million, increasing annually based on CPI.
	Net periodic benefit cost for the Executive Retirement Plan for the three years in the period ended December 31, 2014 is comprised of the following:
		Year Ended December 31,
	(Dollars in thousands)	2014				2013			2012
	Service cost	$	88			$	86		$	77
	Interest cost	687				597			725
	Amortization of prior service cost	(1,189		)		(1,189		)	(723		)
	Amortization of net gain	469				1,380			990
		55				874			1,069
	Net (gain) loss recognized in Accumulated other comprehensive income (loss)	2,570				(2,143		)	(1,240		)
	Total recognized in net periodic benefit gain and Accumulated other comprehensive income (loss)	$	2,625			$	(1,269	)	$	(171	)
	The Company estimates that approximately $0.4 million of the amounts included in Accumulated other comprehensive income (loss) will be amortized to expense in 2015.
	The Executive Retirement Plan is unfunded, and benefits will be paid from earnings of the Company. The following table sets forth the benefit obligations as of December 31, 2014 and 2013.
		Year Ended December 31,
	(Dollars in thousands)	2014				2013
	Benefit obligation at beginning of year	$	13,890			$	15,201
	Service cost	88				86
	Interest cost	687				597
	Benefits paid	(42		)		(42		)
	Actuarial (gain) loss, net	1,850				(1,952		)
	Benefit obligation at end of year	$	16,473			$	13,890
	Amounts recognized in the Consolidated Balance Sheets are as follows:
		Year Ended December 31,
	(Dollars in thousands)	2014				2013
	Net liabilities included in other liabilities	$	(13,954	)		$	(13,941	)
	Amounts recognized in accumulated other comprehensive income (loss)	(2,519		)		51
	The Company's assumed discount rates and compensation increases, which are used to measure the year-end benefit obligations and earnings for the subsequent year related to the Executive Retirement Plan are detailed in the following table for the three years ended December 31, 2014:
		2014		2013		2012
	Discount rates	4.08	%	4.92	%	3.91	%
	Compensation increases	2.7	%	2.7	%	2.7	%

Stock_and_Other_Incentive_Plan

Stock and Other Incentive Plans	12 Months Ended
	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock and Other Incentive Plans	Stock and Other Incentive Plans
	Stock Incentive Plan
	The Incentive Plan authorizes the Company to issue 2,390,272 shares of common stock to its employees and directors. The Incentive Plan will continue until terminated by the Company’s Board of Directors. As of December 31, 2014, 2013 and 2012, the Company had issued, net of forfeitures, a total of 1,816,580 shares, 1,693,266 shares and 1,576,632 shares, respectively, under the Incentive Plan for compensation-related awards to employees and directors, with a total of 573,692 authorized shares, 697,006 authorized shares and 813,640 authorized shares, respectively, remaining which had not been issued. Non-vested shares issued under the Incentive Plan are generally subject to fixed vesting periods varying from three to eight years beginning on the date of issue. If a recipient voluntarily terminates his or her relationship with the Company or is terminated for cause before the end of the vesting period, the shares are forfeited, at no cost to the Company. Once the shares have been issued, the recipient has the right to receive dividends and the right to vote the shares. Compensation expense recognized during the years ended December 31, 2014, 2013 and 2012 from the amortization of the value of shares over the vesting period issued to employees was $3.6 million, $4.3 million and $2.5 million, respectively.
	The Incentive Plan also authorizes the Company's Compensation Committee of its Board of Directors to grant restricted stock units or other performance awards to eligible employees. Such awards, if issued, will also be subject to restrictions and other conditions as determined appropriate by the Compensation Committee. Grantees of restricted stock units will not have stockholder voting rights and will not receive dividend payments. The award of performance units does not create any stockholder rights. Upon satisfaction of certain performance targets as determined by the Compensation Committee, payment of the performance units may be made in cash, shares of common stock, or a combination of cash and common stock, at the option of the Compensation Committee. As of December 31, 2014, the Company had not granted any restricted stock units or other performance awards under the Incentive Plan.
	Executive Incentive Program
	On July 31, 2012, the Company adopted a new Executive Incentive Program. The Executive Incentive Program was adopted to provide specific award criteria with respect to incentive awards made under the Incentive Plan subject to the discretion of the Compensation Committee. No new shares of common stock were authorized in connection with the Executive Incentive Program. Under the terms of the Executive Incentive Program, the Company's named executive officers, and certain other members of senior management beginning in 2013, may earn incentive awards in the form of cash and non-vested stock. Cash incentive awards are based on individual and Company performance. Company performance is measured over a four-quarter period against targeted financial and operational metrics set in advance by the Compensation Committee. Non-vested stock awards are based on the Company's relative total shareholder return performance over one-year and three-year periods, measured against the Company's peer group. The officers may also receive non-vested stock awards by electing to take cash incentive awards in the form of non-vested stock. The following details the awards that have been earned from this program:
	•	On December 31, 2014, the Company granted performance-based awards to its five named executive officers and five senior vice presidents with a grant date fair value totaling $3.9 million, which were granted in the form of 140,930 non-vested shares, with a three-year vesting period, which will result in annual compensation expense of $1.3 million for the years ended 2015, 2016 and 2017, respectively.
	•	On December 31, 2013, the Company granted performance-based awards to its five named executive officers and six senior vice presidents with a grant date fair value totaling $1.0 million, which were granted in the form of 47,709 non-vested shares, with a three-year vesting period, which will result in annual compensation expense of $0.3 million for the years ended 2014, 2015 and 2016, respectively.
	•	On December 31, 2012, the Company granted performance-based awards to its five named executive officers with a grant date fair value totaling $2.7 million, which were granted in the form of 112,132 non-vested shares, with a three-year vesting period, which will result in annual compensation expense of $0.9 million for the years ended 2013, 2014 and 2015, respectively.
	Long-Term Incentive Program
	In the first quarter of 2014 and fourth quarter of 2012, the Company granted a performance-based award under the Long-term Incentive Program adopted under the Incentive Plan (the "LTIP") totaling approximately $0.6 million and $3.6 million, respectively, which was granted in the form of 27,094 non-vested shares and 154,696 non-vested shares, respectively. The shares have vesting periods ranging from three to eight years with a weighted average vesting period of approximately six years. No performance-based awards were released under the Incentive Plan during 2013. Beginning in 2012, the Company's executive officers were no longer eligible to participate in the LTIP and beginning in 2013, five senior vice presidents were also no longer eligible to participate.
	In the first quarter of 2014, the Company granted a special release of 2,968 non-vested shares to three of its officers in lieu of a cash compensation increase. The shares have a vesting period of eight years.
	Salary Deferral Plan
	The Company's salary deferral plan allows officers to elect to defer up to 50% of their base salary in the form of non-vested shares subject to long-term vesting issued under the Incentive Plan. The number of shares will be increased through a Company match depending on the length of the vesting period selected by the officer. The officer's vesting period choices are: three years for a 30% match; five years for a 50% match; and eight years for a 100% match. During 2014, 2013 and 2012, the Company issued 71,460, shares 66,787 shares and 89,421 shares, respectively, to its officers through the salary deferral plan.
	Non-employee Directors Incentive Plan
	The Company issues non-vested shares to its non-employee directors under the Incentive Plan. The directors’ shares issued generally have a three-year vesting period and are subject to forfeiture prior to such date upon termination of the director’s service, at no cost to the Company. During 2014, 2013 and 2012, the Company issued 26,677 shares, 20,256 shares, and 27,864 shares, respectively, to its non-employee directors through the Incentive Plan. For 2014, 2013 and 2012, compensation expense resulting from the amortization of non-vested share grants to directors was approximately $0.5 million, $0.6 million, and $0.6 million, respectively.
	A summary of the activity under the Incentive Plan and related information for the three years in the period ended December 31, 2014 follows:
		Year Ended December 31,
		2014				2013				2012
	Stock-based awards, beginning of year	1,788,168				1,770,061				1,430,675
	Granted	269,129				134,752				397,917
	Vested	(931,767		)		(116,645		)		(58,531		)
	Forfeited	(67,798		)		—				—
	Stock-based awards, end of year	1,057,732				1,788,168				1,770,061
	Weighted-average grant date fair value of:
	Stock-based awards, beginning of year	$	23.81			$	23.97			$	24.42
	Stock-based awards granted during the year	$	25.27			$	23.9			$	22.35
	Stock-based awards vested during the year	$	24.13			$	26.35			$	23.99
	Stock-based awards forfeited during the year	$	22.01			$	—			$	—
	Stock-based awards, end of year	$	24.01			$	23.81			$	23.97
	Grant date fair value of shares granted during the year	$	6,800,122			$	3,220,623			$	8,894,424
	The vesting periods for the non-vested shares granted during 2014 ranged from three to eight years with a weighted-average amortization period remaining as of December 31, 2014 of approximately 3.7 years.
	During 2014, 2013 and 2012, the Company withheld 371,017 shares, 18,118 shares and 3,359 shares, respectively, of common stock from its officers to pay estimated withholding taxes related to the vesting of shares.
	401(k) Plan
	The Company maintains a 401(k) plan that allows eligible employees to defer salary, subject to certain limitations imposed by the Code. The Company provides a matching contribution of up to 3% of each eligible employee’s salary, subject to certain limitations. The Company’s matching contributions were approximately $0.4 million during 2014, 2013 and 2012.
	Dividend Reinvestment Plan
	The Company is authorized to issue 1,000,000 shares of common stock to stockholders under the Dividend Reinvestment Plan. As of December 31, 2014, the Company had issued 532,071 shares under the plan of which 12,606 shares were issued in 2014, 16,422 shares were issued in 2013 and 16,732 shares were issued in 2012.
	Employee Stock Purchase Plan
	The Company has an Employee Stock Purchase Plan, pursuant to which the Company is authorized to issue shares of common stock. As of December 31, 2014, 2013 and 2012, the Company had a total of 88,495 shares, 142,367 shares and 169,099 shares authorized under the Employee Stock Purchase Plan, respectively, which had not been issued or optioned. Under the Employee Stock Purchase Plan, each eligible employee in January of each year is able to purchase up to $25,000 of common stock at the lesser of 85% of the market price on the date of grant or 85% of the market price on the date of exercise of such option. The number of shares subject to each year’s option becomes fixed on the date of grant. Options granted under the Employee Stock Purchase Plan expire if not exercised 27 months after each such option’s date of grant. Cash received from employees upon exercising options under the Employee Stock Purchase Plan was approximately $1.2 million for the year ended December 31, 2014, $1.3 million for the year ended December 31, 2013, and $1.0 million for the year ended December 31, 2012.
	A summary of the Employee Stock Purchase Plan activity and related information for the three years in the period ended December 31, 2014 is as follows:
		Year Ended December 31,
		2014				2013				2012
	Options outstanding, beginning of year	391,108				433,452				425,196
	Granted	275,655				246,717				327,936
	Exercised	(51,078		)		(69,076		)		(59,163		)
	Forfeited	(63,908		)		(49,434		)		(78,202		)
	Expired	(157,875		)		(170,551		)		(182,315		)
	Options outstanding and exercisable, end of year	393,902				391,108				433,452
	Weighted-average exercise price of:
	Options outstanding, beginning of year	$	17.05			$	16.78			$	15.8
	Options granted during the year	$	18.11			$	20.41			$	15.8
	Options exercised during the year	$	17.76			$	17.09			$	16.18
	Options forfeited during the year	$	18.58			$	17.98			$	16.74
	Options expired during the year	$	15.8			$	17.99			$	18.24
	Options outstanding, end of year	$	19.17			$	17.05			$	16.78
	Weighted-average fair value of options granted during the year (calculated as of the grant date)	$	4.35			$	5.08			$	4.13
	Intrinsic value of options exercised during the year	$	436,547			$	375,335			$	439,645
	Intrinsic value of options outstanding and exercisable (calculated as of December 31)	$	3,209,456			$	1,665,331			$	3,132,506
	Exercise prices of options outstanding (calculated as of December 31)	$	19.17			$	17.05			$	16.78
	Weighted-average contractual life of outstanding options (calculated as of December 31, in years)	0.8				0.8				0.8
	The fair values for these options were estimated at the date of grant using a Black-Scholes options pricing model with the weighted-average assumptions for the options granted during the period noted in the following table. The risk-free interest rate was based on the U.S. Treasury constant maturity-nominal two-year rate whose maturity is nearest to the date of the expiration of the latest option outstanding and exercisable; the expected dividend yield was based on the expected dividends of the current year as a percentage of the average stock price of the prior year; the expected life of each option was estimated using the historical exercise behavior of employees; expected volatility was based on historical volatility of the Company’s common stock; and expected forfeitures were based on historical forfeiture rates within the look-back period.
		2014			2013			2012
	Risk-free interest rates	0.38	%		0.25	%		0.25	%
	Expected dividend yields	4.94	%		5.17	%		6.17	%
Expected life (in years)	1.39			1.35			1.46
Expected volatility	23	%		25.6	%		30.3	%
Expected forfeiture rates	75	%		85	%		70	%

Earnings_Per_Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share
	The table below sets forth the computation of basic and diluted earnings per common share for the three years in the period ended December 31, 2014.
		Year Ended December 31,
	(Dollars in thousands, except per share data)	2014			2013			2012
	Weighted Average Common Shares
	Weighted average Common Shares outstanding	97,093,960			92,725,112			80,360,422
	Non-vested shares	(1,814,734		)	(1,784,485		)	(1,515,582		)
	Weighted average Common Shares - Basic	95,279,226			90,940,627			78,844,840
	Weighted average Common Shares - Basic	95,279,226			90,940,627			78,844,840
	Dilutive effect of non-vested shares	1,364,236			—			—
	Dilutive effect of employee stock purchase plan	115,948			—			—
	Weighted average Common Shares - Diluted	96,759,410			90,940,627			78,844,840
	Net Income (loss)
	Income (loss) from continuing operations	$	33,979		$	(13,092	)	$	(892	)
	Noncontrolling interests’ share in earnings	(313		)	(37		)	(70		)
	Income (loss) from continuing operations attributable to common stockholders	33,666			(13,129		)	(962		)
	Discontinued operations	(1,779		)	20,075			6,427
	Net income attributable to common stockholders	$	31,887		$	6,946		$	5,465
	Basic Earnings (loss) Per Common Share
	Income (loss) from continuing operations	$	0.35		$	(0.14	)	$	(0.01	)
	Discontinued operations	(0.02		)	0.22			0.08
	Net income attributable to common stockholders	$	0.33		0.08			0.07
	Diluted Earnings (loss) Per Common Share
	Income (loss) from continuing operations	$	0.35		$	(0.14	)	$	(0.01	)
	Discontinued operations	(0.02		)	0.22			0.08
	Net income attributable to common stockholders	$	0.33		$	0.08		$	0.07
	For the years ended December 31, 2013 and 2012, non-vested shares totaling 1,288,166 and 1,144,465, respectively, and options under the Employee Stock Purchase Plan to purchase shares totaling 157,733 and 138,578, respectively, of the Company’s common stock were excluded from the calculation of diluted earnings (loss) per common share because the effect was anti-dilutive due to the loss from continuing operations during those periods.

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies
	Tenant Improvements
	As of December 31, 2014, the Company had remaining funding commitments of tenant improvement allowances related to first generation tenant improvements ranging between $11.9 million and $15.6 million on properties that were developed by the Company.
	The Company may provide a tenant improvement allowance in new or renewal leases for the purpose of refurbishing or renovating tenant space. As of December 31, 2014, the Company had commitments of approximately $13.4 million that is expected to be spent on tenant improvements related second generation space throughout the portfolio.
	Operating Leases
	As of December 31, 2014, the Company was obligated under operating lease agreements consisting primarily of the Company’s corporate office lease and ground leases related to 45 real estate investments with expiration dates through 2105. The Company’s corporate office lease currently covers approximately 36,653 square feet of rented space and expires on October 31, 2020. Annual base rent on the corporate office lease increases approximately 3.25% annually. The Company’s ground leases generally increase annually based on increases in the consumer price index. Rental expense relating to the operating leases for the years ended December 31, 2014, 2013 and 2012 was $4.9 million, $4.4 million and $4.3 million, respectively. The Company prepaid certain of its ground leases which represented approximately $0.5 million, of the Company’s rental expense for the years ended December 31, 2014, 2013, and 2012. The Company’s future minimum lease payments for its operating leases, excluding leases that the Company has prepaid and leases in which an operator pays or fully reimburses the Company, as of December 31, 2014 were as follows (in thousands):
	2015	$	5,001
	2016	5,070
	2017	5,129
	2018	5,154
	2019	5,250
	2020 and thereafter	286,699
		$	312,303
	Legal Proceedings
	The Company paid $950,000 in 2013, which was accrued in general and administrative expenses at the end of 2012, in connection with the settlement of one litigation matter. The Company is not aware of any pending or threatened litigation that, if resolved against the Company, would have a material adverse effect on the Company's consolidated financial position, results of operations, or cash flows.

Other_Data

Other Data	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Other Data	Other Data
	Taxable Income (unaudited)
	The Company has elected to be taxed as a REIT, as defined under the Internal Revenue Code. To qualify as a REIT, the Company must meet a number of organizational and operational requirements, including a requirement that it currently distribute at least 90% of its taxable income to its stockholders.
	As a REIT, the Company generally will not be subject to federal income tax on taxable income it distributes currently to its stockholders. Accordingly, no provision for federal income taxes has been made in the accompanying Consolidated Financial Statements. If the Company fails to qualify as a REIT for any taxable year, then it will be subject to federal income taxes at regular corporate rates, including any applicable alternative minimum tax, and may not be able to qualify as a REIT for four subsequent taxable years. Even if the Company qualifies as a REIT, it may be subject to certain state and local taxes on its income and property and to federal income and excise tax on its undistributed taxable income.
	Earnings and profits (as defined under the Internal Revenue Code), the current and accumulated amounts of which determine the taxability of distributions to stockholders, vary from net income attributable to common stockholders and taxable income because of different depreciation recovery periods, depreciation methods, and other items.
	On a tax-basis, the Company’s gross real estate assets totaled approximately $3.3 billion, $3.1 billion, and $2.8 billion, respectively, for the three years ended December 31, 2014.
	The following table reconciles the Company’s consolidated net income attributable to common stockholders to taxable income for the three years ended December 31, 2014:
		Year Ended December 31,
	(Dollars in thousands)	2014			2013				2012
	Net income attributable to common stockholders	$	31,887		$	6,946			$	5,465
	Reconciling items to taxable income:
	Depreciation and amortization	28,332			26,240				28,526
	Gain or loss on disposition of depreciable assets	(4,940		)	(3,656		)		922
	Impairments	—			6,222				3,807
	Straight-line rent	(12,203		)	(6,493		)		(6,075		)
	Receivable allowances	2,074			(716		)		(74		)
	Stock-based compensation	2,020			5,817				5,400
	Other	1,213			(1,866		)		8,917
		16,496			25,548				41,423
	Taxable income (1)	$	48,383		$	32,494			$	46,888
	Dividends paid	$	116,371		$	111,571			$	96,356
	______
	(1) Before REIT dividend paid deduction.
	Characterization of Distributions (unaudited)
	Distributions in excess of earnings and profits generally constitute a return of capital. The following table gives the characterization of the distributions on the Company’s common stock for the three years ended December 31, 2014.
	For the three years ended December 31, 2014, there were no preferred shares outstanding. As such, no dividends were distributed related to preferred shares for those periods.
		2014						2013						2012
		Per Share			%			Per Share				%		Per Share		%
	Common stock:
	Ordinary income	$	0.5		42	%		$	0.27			22.2	%	$	0.63	52.3	%
	Return of capital	0.7			58	%		0.8				66.3	%	0.56		47.1	%
	Unrecaptured section 1250 gain	—			—	%		0.13				11.5	%	0.01		0.6	%
	Common stock distributions	$	1.2		100	%		$	1.2			100	%	$	1.2	100	%
	State Income Taxes
	The Company must pay certain state income taxes, which are included in general and administrative expense on the Company’s Consolidated Statements of Operations.
	The State of Texas gross margins tax on gross receipts from operations is disclosed in the table below as an income tax because it is considered such by the Securities and Exchange Commission.
	State income tax expense and state income tax payments for the three years ended December 31, 2014 are detailed in the table below:
		Year Ended December 31,
	(Dollars in thousands)	2014			2013				2012
	State income tax expense:
	Texas gross margins tax (1)	$	694		$	649			$	843
	Other	58			23				3
	Total state income tax expense	$	752		$	672			$	846
	State income tax payments, net of refunds and collections	$	593		$	768			$	627
	______
	-1	In the table above, income tax expense for 2014 and 2012 includes approximately $0.1 million that was recorded to the gain on sale of real estate properties sold, which is included in discontinued operations rather than general and administrative expenses on the Company’s Consolidated Statements of Operations.

Fair_Value_of_Financial_Instru

Fair Value of Financial Instruments	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	Fair Value of Financial Instruments
	The carrying amounts of cash and cash equivalents, receivables and payables are a reasonable estimate of their fair value as of December 31, 2014 and 2013 due to their short-term nature. The fair value of notes and bonds payable is estimated using cash flow analyses as of December 31, 2014 and 2013, based on the Company’s current interest rates for similar types of borrowing arrangements. The fair value of the mortgage notes and notes receivable is estimated based either on cash flow analyses at an assumed market rate of interest or at a rate consistent with the rates on mortgage notes acquired by the Company or notes receivable entered into by the Company recently.
	The table below details the fair value and carrying values for notes and bonds payable, mortgage notes receivable and notes receivable as of December 31, 2014 and 2013.
		December 31, 2014				December 31, 2013
	(Dollars in millions)	Carrying		Fair		Carrying		Fair
		Value		Value		Value		Value
	Notes and bonds payable (1)	$	1,403.70	$	1,438.80	$	1,348.50	$	1,380.60
	Mortgage notes receivable (2)	$	1.9	$	1.9	$	125.5	$	124.5
	______
	(1) Level 3 - Fair value derived from valuation techniques in which one of more significant inputs or significant value drivers are unobservable.
	(2) Level 2 - Fair value based on quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-driven valuations in which significant inputs and significant value drivers are observable in active markets.

Selected_Quarterly_Financial_D

Selected Quarterly Financial Data (Unaudited)	12 Months Ended
	Dec. 31, 2014
Selected Quarterly Financial Information [Abstract]
Selected Quarterly Financial Data (unaudited)	Selected Quarterly Financial Data (unaudited)
	Quarterly financial information for the year ended December 31, 2014 is summarized below. The results of operations have been restated, as applicable, to show the effect of reclassifying properties sold or to be sold as discontinued operations.
		Quarter Ended
	(Dollars in thousands, except per share data)	March 31 (1)			June 30 (2)			September 30 (3)			December 31 (4)
	2014
	Revenues from continuing operations	$	90,571		$	91,671		$	93,612		$	95,001
	Income from continuing operations	7,477			9,005			8,437			9,060
	Discontinued operations	(3,514		)	(2,994		)	(4,284		)	9,013
	Net income	3,963			6,011			4,153			18,073
	Less: (Income) from noncontrolling interests	(111		)	(40		)	(162		)	—
	Net income attributable to common stockholders	$	3,852		$	5,971		$	3,991		$	18,073
	Net income attributable to common stockholders per share:
	Basic earnings per common share	$	0.04		$	0.06		$	0.04		$	0.19
	Diluted earnings per common share	$	0.04		$	0.06		$	0.04		$	0.18
	______
	(1) The decreases in net income and amounts per share for the first quarter of 2014 are primarily attributable to impairment charges of $3.4 million.
	(2) The increases in net income and amounts per share for the second quarter of 2014 are primarily attributable to a $1.9 million cash reimbursement received by the Company for certain operating expenses paid by the Company for years 2006 through 2013.
	(3) The decreases in net income and amounts per share for the third quarter of 2014 are primarily attributable to impairment charges of $4.5 million.
	(4) The increases in net income and amounts per share for the fourth quarter of 2014 are primarily attributable to gains on sales of real estate totaling $9.3 million, partially offset by impairment charges of $1.0 million.
	Quarterly financial information for the year ended December 31, 2013 is summarized below. The results of operations have been restated, as applicable, to show the effect of reclassifying properties sold or to be sold as discontinued operations.
		Quarter Ended
	(Dollars in thousands, except per share data)	March 31 (1)			June 30 (2)			September 30 (3)			December 31 (4)
	2013
	Revenues from continuing operations	$	78,970		$	80,552		$	82,805		$	88,622
	Income (loss) from continuing operations	602			(27,861		)	4,511			9,656
	Discontinued operations	(1,620		)	3,623			15,272			2,800
	Net income (loss)	(1,018		)	(24,238		)	19,783			12,456
	Less: (Income) loss from noncontrolling interests	19			33			(17		)	(72		)
	Net income (loss) attributable to common stockholders	$	(999	)	$	(24,205	)	$	19,766		$	12,384
	Net income attributable to common stockholders per share:
	Basic earnings (loss) per common share	$	(0.01	)	$	(0.27	)	$	0.21		$	0.13
	Diluted earnings (loss) per common share	$	(0.01	)	$	(0.27	)	$	0.21		$	0.13
	______
	(1) The decreases in net income and amounts per share for the first quarter of 2013 are primarily attributable to impairment charges of $3.6 million.
	(2) The decreases in net income and amounts per share for the second quarter of 2013 are primarily attributable to losses of extinguishment of debt of $29.9 million, of which $0.3 million is included in discontinued operations. This amount is partially offset by gains on sales of real estate totaling $1.8 million.
	(3) The increases in net income and amounts per share for the third quarter of 2013 are primarily attributable to gains on sales of real estate totaling $20.2 million, partially offset by impairment charges of $6.3 million.
	(4) The increases in net income and amounts per share for the fourth quarter of 2013 are primarily attributable to gains on sales of real estate totaling $2.7 million.

Schedule_II_Valuation_and_Qual

Schedule II - Valuation and Qualifying Accounts	12 Months Ended
	Dec. 31, 2014
Valuation and Qualifying Accounts [Abstract]
Valuation and Qualifying Accounts	Schedule II – Valuation and Qualifying Accounts for the years ended December 31, 2014, 2013 and 2012
	(Dollars in thousands)
			Balance at Beginning of Period		Additions				Uncollectible Accounts Written-off		Balance at End of Period
	Description				Charged to Costs and Expenses		Charged to Other Accounts
	2014	Accounts and notes receivable allowance	$	541	$	34	$	—	$	110	$	465
	2013	Accounts and notes receivable allowance	$	740	$	185	$	—	$	384	$	541
	2012	Accounts and notes receivable allowance	$	583	$	240	$	—	$	83	$	740

Schedule_III_Real_Estate_and_A

Schedule III - Real Estate and Accumulated Depreciation	12 Months Ended
	Dec. 31, 2014
SEC Schedule III, Real Estate and Accumulated Depreciation Disclosure [Abstract]
Real Estate and Accumulated Depreciation	Schedule III – Real Estate and Accumulated Depreciation as of December 31, 2014
	(Dollars in thousands)
					Land												Buildings, Improvements, Lease Intangibles and CIP
	Property  Type	Number of Properties		State	Initial Investment				Cost Capitalized Subsequent to Acquisition				Total				Initial Investment				Cost Capitalized Subsequent to Acquisition				Total		Personal Property		(2) (3) (5)  Total Property		(1) (3) (5) Accumulated Depreciation		(4) Encumbrances		Date Acquired	Date Constructed
	Medical office/outpatient	175		AL, AZ, CA, CO, DC, FL, GA,  HI, IA, IL, IN,  KS, LA, MD, MI, MN, MO, MS, NC, NV, OH, OK, OR, SC, SD, TN, TX, VA, WA	$	155,470			$	2,725			$	158,195			$	2,200,146			$	356,836			$	2,556,982	$	3,507	$	2,718,684	$	589,686	$	171,796	1993-2014	1905 -2014
	Inpatient	14		AZ, CA, CO, IN, MO, PA, TX	23,236				150				23,386				406,108				14,161				420,269		265		443,920		84,285		—		1994-2013	1983 -2013
	Other	11		AL, IA, IN, MI TN, VA	1,828				73				1,901				76,014				7,808				83,822		679		86,402		27,330		1,471		1993-2014	1906 - 2008
	Total Real Estate	200			180,534				2,948				183,482				2,682,268				378,805				3,061,073		4,451		3,249,006		701,301		173,267
	Land Held for Develop.	—			17,054				—				17,054				—				—				—		—		17,054		115		—
	Corporate Property	—			—				—				—				—				—				—		5,476		5,476		3,719		—
	Total Properties	200			$	197,588			$	2,948			$	200,536			$	2,682,268			$	378,805			$	3,061,073	$	9,927	$	3,271,536	$	705,135	$	173,267
	-1	Includes two assets held for sale as of December 31, 2014 of approximately $13.3 million (gross) and accumulated depreciation of $4.5 million, three asset held for sale as of December 31, 2013 of approximately $17.0 million (gross) and accumulated depreciation of $10.2 million; and one assets held for sale as of December 31, 2012 of $9.6 million (gross) and accumulated depreciation of $6.3 million.
	-2	Total assets as of December 31, 2014 have an estimated aggregate total cost of $3.3 billion for federal income tax purposes.
	-3	Depreciation is provided for on a straight-line basis on buildings and improvements over 3.3 to 39.0 years, lease intangibles over 1.0 to 93.1 years, personal property over 1.9 to 15.8 years, and land improvements over 15.0 to 38.1 years.
	-4	Includes unamortized premium of $3.2 million and unaccreted discount of $2.5 million as of December 31, 2014.
	-5	A reconciliation of Total Property and Accumulated Depreciation for the twelve months ended December 31, 2014, 2013 and 2012 follows:
		Year Ended								Year Ended								Year Ended
		December 31, 2014 (1)								December 31, 2013 (1)								December 31, 2012 (1)
	(Dollars in thousands)	Total Property				Accumulated Depreciation				Total Property				Accumulated Depreciation				Total Property				Accumulated Depreciation
	Beginning Balance	$	3,084,166			$	642,320			$	2,830,931			$	586,920			$	2,831,732			$	536,682
	Additions during the period:
	Real Estate acquired	166,290				2,272				314,159				1,046				104,810				1,079
	Other improvements	55,340				105,257				58,849				97,255				55,299				94,250
	Acquisition through Foreclosure	40,247				1,536				—				—				—				—
	Land held for development	—				26				—				26				—				26
	Construction in Progress	—				—				—				—				5,608				—
	Retirement/dispositions:
	Real Estate	(74,507		)		(46,276		)		(111,656		)		(42,927		)		(128,325		)		(45,117		)
	Disposal of previously consolidated VIE	—				—				—				—				(38,193		)		—
	Land held for development	—				—				(8,117		)		—				—				—
	Ending Balance	$	3,271,536			$	705,135			$	3,084,166			$	642,320			$	2,830,931			$	586,920

Schedule_IV_Mortgage_Loans_on_

Schedule IV - Mortgage Loans on Real Estate	12 Months Ended
	Dec. 31, 2014
Mortgage Loans on Real Estate [Abstract]
Mortgage Loans on Real Estate	Schedule IV – Mortgage Loans on Real Estate as of December 31, 2014
	(Dollars in thousands)
	Description	Interest Rate			Maturity Date		Periodic Payment Terms		Original Face Amount			Carrying Amount (2)		Balloon
	Permanent Mortgage Loans:
	Medical office building in Nevada (1)	6.5	%		9/30/17		(1	)	$	1,900		$	1,900	$	1,650
	Total Mortgage Loans											$	1,900
	______
	-1	Interest only until maturity. The borrower is required to make a $0.3 million principal reduction in 2015. Principal payments may be made during term without penalty with remaining principal balance due at maturity.
	-2	A rollforward of Mortgage loans on real estate for the three years ended December 31, 2014 follows:
		Year Ended December 31,
	(Dollars in thousands)	2014				2013			2012
	Balance at beginning of period	$	125,547			$	162,191		$	97,381
	Additions during period:
	New or acquired mortgages	1,900				4,241			11,200
	Increased funding on existing mortgages	1,244				58,731			78,297
		3,144				62,972			89,497
	Deductions during period:
	Scheduled principal payments	—				—			(16		)
	Principal repayments and reductions (3)	(5,605		)		(2,413		)	(14,812		)
	Principal reductions due to acquisitions (4) (5)	(81,213		)		(97,203		)	(9,859		)
	Foreclosed mortgage note receivable (6)	(39,973		)		—			—
		(126,791		)		(99,616		)	(24,687		)
	Balance at end of period (7)	$	1,900			$	125,547		$	162,191
	-3	Principal repayments for the years ended December 31, 2014, 2013 and 2012 include unscheduled principal reductions on mortgage notes of $5.6 million, $2.4 million and $14.8 million, respectively.
	-4	In September, 2013, the Company acquired an orthopedic facility in Missouri for $102.6 million, including the elimination of the construction mortgage note receivable totaling $97.2 million. In May 2012, the Company purchased a medical office building in Texas. Concurrent with the acquisition, the Company's construction mortgage note receivable totaling $9.9 million, which secured the building, was repaid.
	-5	In May 2014, the Company acquired a medical office building in Oklahoma for $85.4 million, including the elimination of the construction mortgage note receivable totaling $81.2 million and cash consideration of approximately $4.2 million.
	-6	In March 2014, the Company acquired a medical office building in Iowa in satisfaction of a $40.0 million mortgage note receivable that matured on January 10, 2014. The cash flows from the operations of the property were sufficient to pay the Company interest from the maturity date through the date of the transfer of ownership to the Company at the 7.7% fixed interest rate plus an additional 3% of interest for the default interest rate. The Company did not recognize any of the $1.5 million exit fee receivable that was due upon maturity of the mortgage note receivable.
	-7	Total mortgage loans as of December 31, 2014 had an aggregate total cost of $1.9 million for federal income tax purposes.

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Business Overview	Business Overview
	Healthcare Realty Trust Incorporated (the “Company”) is a real estate investment trust ("REIT") that owns, acquires, manages, finances and develops income-producing real estate properties associated primarily with the delivery of outpatient healthcare services throughout the United States of America. The Company had investments of approximately $3.3 billion in 199 real estate properties, mortgages, land held for development and corporate property as of December 31, 2014. The Company’s 198 owned real estate properties are located in 30 states and total approximately 14.2 million square feet. The Company provided property management services to approximately 9.5 million square feet nationwide. Square footage disclosures in this Annual Report on Form 10-K are unaudited.
Principles of Consolidation	Principles of Consolidation
	The Consolidated Financial Statements include the accounts of the Company, its wholly owned subsidiaries, joint ventures, partnerships and consolidated variable interest entities (“VIE”) where the Company controls the operating activities of the VIE.
	In accordance with the consolidation accounting standards, the Company must evaluate each contractual relationship it has with its lessees, borrowers, or others to determine whether or not the contractual arrangement creates a variable interest in those entities. If the Company determines that it has a variable interest and the entity is a VIE, then management must determine whether or not the Company is the primary beneficiary of the VIE, resulting in consolidation of the VIE. A primary beneficiary has the power to direct those activities of the VIE that most significantly impact its economic performance and has the obligation to absorb the losses of, or receive the benefits from, the VIE.
	The Company had a variable interest in unconsolidated VIEs consisting of one construction mortgage notes receivable aggregating approximately $80.0 million as of December 31, 2013, in which management concluded that the Company was not the primary beneficiary. See Note 5 for more information on this construction mortgage notes receivable. There were no VIEs at December 31, 2014.
	During 2014, the Company acquired the outstanding 40% noncontrolling interest holders' investment in a partnership, HRP MAC III, LLC, that held $18.0 million in real estate assets and owns 100% as of December 31, 2014. During 2013, the Company received capital contributions of $1.8 million from a 40% noncontrolling interest holder in the partnership. The Company reports noncontrolling interests in subsidiaries as a component of equity and the related net income or loss attributable to the noncontrolling interests as part of consolidated net income or loss in its Consolidated Financial Statements. See Note 4 for additional information.
	All significant intercompany accounts, transactions and balances have been eliminated upon consolidation in the Consolidated Financial Statements.
Use of Estimates in the Consolidated Financial Statements	Use of Estimates in the Consolidated Financial Statements
	Preparation of the Consolidated Financial Statements in accordance with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect amounts reported in the Consolidated Financial Statements and accompanying notes. Actual results may differ from those estimates.
Segment Reporting	Segment Reporting
	The Company owns, acquires, manages, finances and develops outpatient and other healthcare-related properties. The Company is managed as one reporting unit, rather than multiple reporting units, for internal reporting purposes and for internal decision-making. Therefore, the Company discloses its operating results in a single reportable segment.
Reclassifications	Reclassifications
	Certain reclassifications for discontinued operations have been made to the Consolidated Statements of Operations for the years ended December 31, 2013 and 2012 to conform to the 2014 presentation. The operating results of those assets have been reclassified from continuing to discontinued operations for all periods presented.
Real Estate Properties	Real Estate Properties
	Real estate properties are recorded at cost or at fair value if acquired in a transaction that is a business combination under Accounting Standards Codification Topic 805, Business Combinations. Cost or fair value at the time of acquisition is allocated among land, buildings, tenant improvements, lease and other intangibles, and personal property as applicable. The Company’s gross real estate assets, on a financial reporting basis, totaled approximately $3.3 billion as of December 31, 2014 and $3.1 billion as of December 31, 2013.
	During 2014 and 2013, the Company eliminated against accumulated depreciation approximately $9.5 million and $4.3 million, respectively, of fully amortized real estate intangibles that were initially recorded as a component of certain real estate acquisitions. Also during 2014, approximately $0.4 million of fully depreciated tenant and capital improvements that were no longer in service were eliminated against accumulated depreciation.
	Depreciation and amortization of real estate assets and liabilities in place as of December 31, 2014, is provided for on a straight-line basis over the asset’s estimated useful life:
	Land improvements	15.0 to 38.1 years
	Buildings and improvements	3.3 to 39.0 years
	Lease intangibles (including ground lease intangibles)	1.0 to 93.1 years
	Personal property	1.9 to 15.8 years
	The Company capitalizes direct costs, including costs such as construction costs and professional services, and indirect costs, including capitalized interest and overhead costs, associated with the development and construction of real estate assets while substantive activities are ongoing to prepare the assets for their intended use. Capitalized interest cost is calculated using the weighted average interest rate of the Company's unsecured debt or the interest rate on project specific debt, if applicable. The Company continues to capitalize interest on the unoccupied portion of the properties in stabilization for up to one year after the buildings have been placed into service, at which time the capitalization of interest must cease.
Land Held for Development	Land Held for Development
	Land held for development includes parcels of land owned by the Company, upon which the Company intends to develop and own outpatient healthcare facilities. The Company’s investment in land held for development totaled approximately $17.1 million as of December 31, 2014 and 2013.
Asset Impairment	Asset Impairment
	The Company assesses the potential for impairment of identifiable, definite-lived, intangible assets and long-lived assets, including real estate properties, whenever events occur or a change in circumstances indicates that the carrying value might not be fully recoverable. Indicators of impairment may include significant underperformance of an asset relative to historical or expected operating results; significant changes in the Company’s use of assets or the strategy for its overall business; plans to sell an asset before its depreciable life has ended; the expiration of a significant portion of leases in a property; or significant negative economic trends or negative industry trends for the Company or its operators. In addition, the Company reviews for possible impairment, those assets subject to purchase options and those impacted by casualties, such as tornadoes and hurricanes. If management determines that the carrying value of the Company’s assets may not be fully recoverable based on the existence of any of the factors above, or others, management would measure and record an impairment charge based on the estimated fair value of the property or the estimated fair value less costs to sell the property.
Accounting for Acquisitions of Real Estate Properties with In-Place Leases	Acquisitions of Real Estate Properties with In-Place Leases
	Acquisitions of real estate properties are accounted for at fair value. When a building with in-place leases is acquired, the cost of the acquisition must be allocated between the tangible real estate assets "as-if vacant" and the intangible real estate assets related to in-place leases based on their estimated fair values. Where appropriate, the intangible assets recorded could include goodwill or customer relationship assets. The values related to above- or below-market in-place lease intangibles are amortized to rental income where the Company is the lessor, are amortized to property operating expense where the Company is the lessee, and are amortized over the remaining term of the leases upon acquisition.
	The Company considers whether any of the in-place lease rental rates are above- or below-market. An asset (if the actual rental rate is above-market) or a liability (if the actual rental rate is below-market) is calculated and recorded in an amount equal to the present value of the future cash flows that represent the difference between the actual lease rate and the average market rate. If an in-place lease is identified as a below-market rental rate, the Company would also evaluate any renewal options associated with that lease to determine if the intangible should include those periods.
	The Company also estimates an absorption period, which can vary by property, assuming the building is vacant and must be leased up to the actual level of occupancy when acquired. During that absorption period, the owner would incur direct costs, such as tenant improvements, and would suffer lost rental income. Likewise, the owner would have acquired a measurable asset in that, assuming the building was vacant, certain fixed costs would be avoided because the actual in-place lessees would reimburse a certain portion of fixed costs through expense reimbursements during the absorption period.
	All of these intangible assets (above- or below-market lease, tenant improvement costs avoided, rental income lost, and expenses recovered through in-place lessee reimbursements) are estimated and recorded in amounts equal to the present value of estimated future cash flows. The actual purchase price is allocated based on the various asset fair values described above.
	The building and tenant improvement components of the purchase price are depreciated over the estimated useful life of the building or the weighted average remaining term of the in-places leases. The above- or below-market rental rate assets or liabilities are amortized to rental income or property operating expense over the remaining term of the leases. The at-market, in-place lease intangibles are amortized to amortization expense over the weighted average remaining term of the leases, customer relationship assets are amortized to amortization expense over terms applicable to each acquisition, and any goodwill recorded would be reviewed for impairment at least annually.
	The fair values of at-market in-place lease and other intangible assets are amortized and reflected in amortization expense in the Company’s Consolidated Statements of Operations. See Note 9 for more details on the Company’s intangible assets.
Fair Value Measurements	Fair Value Measurements
	Fair value is defined as the price that would be received to sell an asset, or paid to transfer a liability, in an orderly transaction between market participants. In calculating fair value, a company must maximize the use of observable market inputs, minimize the use of unobservable market inputs and disclose in the form of an outlined hierarchy the details of such fair value measurements.
	A hierarchy of valuation techniques is defined to determine whether the inputs to a fair value measurement are considered to be observable or unobservable in a marketplace. Observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect the Company’s market assumptions. This hierarchy requires the use of observable market data when available. These inputs have created the following fair value hierarchy:
	•	Level 1 – quoted prices for identical instruments in active markets;
	•	Level 2 – quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations in which significant inputs and significant value drivers are observable in active markets; and
	•	Level 3 – fair value measurements derived from valuation techniques in which one or more significant inputs or significant value drivers are unobservable.
	Executed purchase and sale agreements, that are binding agreements, are categorized as level one inputs. Brokerage estimates, letters of intent, or unexecuted purchase and sale agreements are considered to be level three as they are nonbinding in nature.
	During 2014, in connection with the sales of six medical office buildings, the Company recorded impairment charges in discontinued operations of approximately $3.7 million based on the contractual sales price, a level one input. The Company used level three inputs to record impairment charges of approximately $8.3 million related to two properties in held for sale and two properties that were reclassified to held for sale during 2014, reducing the Company's carrying value to the estimated fair value of the properties less costs to sell prior to sale. All four of these properties were sold during 2014.
Cash and Cash Equivalents	Cash and Cash Equivalents
	Cash and cash equivalents includes short-term investments with original maturities of three months or less when purchased.
Allowance for Doubtful Accounts and Credit Losses	Allowance for Doubtful Accounts and Credit Losses
	Accounts Receivable
	Management monitors the aging and collectibility of its accounts receivable balances on an ongoing basis. Whenever deterioration in the timeliness of payment from a tenant or sponsoring health system is noted, management investigates and determines the reason or reasons for the delay. Considering all information gathered, management’s judgment is exercised in determining whether a receivable is potentially uncollectible and, if so, how much or what percentage may be uncollectible. Among the factors management considers in determining collectibility are: the type of contractual arrangement under which the receivable was recorded (e.g., a triple net lease, a gross lease, a property operating agreement, or some other type of agreement); the tenant’s reason for slow payment; industry influences under which the tenant operates; evidence of willingness and ability of the tenant to pay the receivable; credit-worthiness of the tenant; collateral, security deposit, letters of credit or other monies held as security; tenant’s historical payment pattern; other contractual agreements between the tenant and the Company; relationship between the tenant and the Company; the state in which the tenant operates; and the existence of a guarantor and the willingness and ability of the guarantor to pay the receivable. Considering these factors and others, management concludes whether all or some of the aged receivable balance is likely uncollectible. Upon determining that some portion of the receivable is likely uncollectible, the Company records a provision for bad debts for the amount it expects will be uncollectible. When efforts to collect a receivable are exhausted, the receivable amount is charged off against the allowance. The Company does not hold any accounts receivable for sale.
	Mortgage Notes
	The Company had one and four mortgage notes receivable outstanding as of December 31, 2014 and 2013 with aggregate principal balances totaling $1.9 million and $125.5 million, respectively. The weighted average maturity of the notes was approximately 2.8 and 0.4 years, respectively, with an interest rate of 6.50% and interest rates ranging from 5.00% to 7.72%, as of December 31, 2014 and 2013, respectively.
	No allowances were recorded on the Company's mortgage notes receivable during 2014 or 2013. The Company evaluates collectibility of its mortgage notes and records allowances on the notes as necessary. A loan is impaired when it is probable that a creditor will be unable to collect all amounts due according to the contractual terms of the loan as scheduled, including both contractual interest and principal payments. This assessment also includes an evaluation of the loan collateral. If a mortgage loan becomes past due, the Company will review the specific circumstances and may discontinue the accrual of interest on the loan. The loan is not returned to accrual status until the debtor has demonstrated the ability to continue debt service in accordance with the contractual terms. Loans placed on non-accrual status will be accounted for either on a cash basis, in which income is recognized only upon receipt of cash, or on a cost-recovery basis, in which all cash receipts reduce the carrying value of the loan, based on the Company’s expectation of future collectibility. As of December 31, 2014 and 2013, there were no recorded investments in mortgage notes that were either on non-accrual status or were past due more than ninety days and continued to accrue interest. Also, as of December 31, 2014, the Company did not hold any of its mortgage notes available for sale.
	In January 2014, one of the Company's mortgage notes receivable had a scheduled balloon payment due of $40.0 million that the borrower was not able to pay. The Company initiated the default process and negotiated a deed in lieu of foreclosure from the borrower. See Note 4 for additional information regarding this transaction.
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets
	Goodwill and intangible assets with indefinite lives are not amortized, but are tested at least annually for impairment. Intangible assets with finite lives are amortized over their respective lives to their estimated residual values and are reviewed for impairment only when impairment indicators are present.
	Identifiable intangible assets of the Company are comprised of enterprise goodwill, in-place lease intangible assets, customer relationship intangible assets, and deferred financing costs. In-place lease and customer relationship intangible assets are amortized on a straight-line basis over the applicable lives of the assets. Deferred financing costs are amortized over the term of the related credit facility or other debt instrument under the straight-line method, which approximates amortization under the effective interest method. Goodwill is not amortized but is evaluated annually as of December 31 for impairment. Both the 2014 and 2013 impairment evaluations indicated that no impairment had occurred with respect to the $3.5 million goodwill asset. See Note 9 for more detail on the Company’s intangible assets.
Contingent Liabilities	Contingent Liabilities
	From time to time, the Company may be subject to loss contingencies arising from legal proceedings and similar matters. Additionally, while the Company maintains comprehensive liability and property insurance with respect to each of its properties, the Company may be exposed to unforeseen losses related to uninsured or underinsured damages.
	The Company continually monitors any matters that may present a contingent liability, and, on a quarterly basis, management reviews the Company’s reserves and accruals in relation to each of them, adjusting provisions as necessary in view of changes in available information. Liabilities for contingencies are first recorded when a loss is determined to be both probable and can be reasonably estimated. Changes in estimates regarding the exposure to a contingent loss are reflected as adjustments to the related liability in the periods when they occur.
	Because of uncertainties inherent in the estimation of contingent liabilities, it is possible that the Company’s provision for contingent losses could change materially in the near term. To the extent that any significant losses, in addition to amounts recognized, are at least reasonably possible, such amounts will be disclosed in the notes to the Consolidated Financial Statements.
Defined Benefit Pension Plan	Defined Benefit Pension Plan
	The Company has a pension plan under which three of the Company’s founding officers may receive retirement benefits upon retirement (the “Executive Retirement Plan”). The plan is unfunded and benefits will be paid from cash flows of the Company. The Company recognizes pension expense on an accrual basis over an estimated service period. The Company calculates pension expense and the corresponding liability annually on the measurement date (December 31) which requires certain assumptions, such as a discount rate and the recognition of actuarial gains and losses. The maximum annual benefits payable to each individual under the plan have been frozen at $0.9 million, subject to cost-of-living adjustments.
Stock-based Compensation	Stock-Based Compensation
	The Company has various employee and director stock-based awards outstanding. These awards include non-vested common stock and options to purchase common stock granted to employees pursuant to the 2007 Employees Stock Incentive Plan and its predecessor plan (the “Incentive Plan”) and the 2000 Employee Stock Purchase Plan (the “Employee Stock Purchase Plan”). The Company recognizes share-based payments to employees and directors in the Consolidated Statements of Operations on a straight-line basis over the requisite service period based on the fair value of the award on the measurement date.
	The Employee Stock Purchase Plan features a “look-back” provision which enables the employee to purchase a fixed number of common shares at the lesser of 85% of the market price on the date of grant or 85% of the market price on the date of exercise, with optional purchase dates occurring once each quarter for 27 months. The Company accounts for awards to its employees under the Employee Stock Purchase Plan based on fair value, using the Black-Scholes model, and generally recognizes expense over the award’s vesting period, net of estimated forfeitures. Since the options granted under the Employee Stock Purchase Plan immediately vest, the Company records compensation expense for those options when they are granted in the first quarter of each year and then may record additional compensation expense in subsequent quarters as warranted. In each of the years ended December 31, 2014, 2013 and 2012, the Company recognized in general and administrative expenses approximately $0.3 million, $0.3 million, and $0.4 million, respectively, of compensation expense related to the annual grant of options to its employees to purchase shares under the Employee Stock Purchase Plan.
	See Note 13 for details on the Company’s stock-based awards.
Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss)
	Certain items must be included in comprehensive income, including items such as foreign currency translation adjustments, minimum pension liability adjustments, and unrealized gains or losses on available-for-sale securities. The Company’s accumulated other comprehensive income (loss) consists of only the cumulative pension liability adjustments, which are generally recognized in the fourth quarter of each year.
Revenue Recognition	Revenue Recognition
	The Company recognizes revenue when it is realized or realizable and earned. There are four criteria that must all be met before a Company may recognize revenue, including that persuasive evidence that an arrangement exists, delivery has occurred or services have been rendered (i.e., the tenant has taken possession of and controls the physical use of the leased asset), the price has been fixed or is determinable, and collectibility is reasonably assured. Income received but not yet earned is deferred until such time it is earned. Deferred revenue, included in other liabilities on the Consolidated Balance Sheets, was $35.4 million and $36.3 million, respectively, as of December 31, 2014 and 2013 which includes deferred tenant improvement reimbursements of $22.4 million and $21.9 million, respectively, which will be recognized as revenue over the life of each respective lease.
	The Company derives most of its revenues from its real estate property and mortgage notes receivable portfolio. The Company’s rental and mortgage interest income is recognized based on contractual arrangements with its tenants, sponsoring health systems or borrowers. These contractual arrangements fall into three categories: leases, mortgage notes receivable, and property operating agreements as described in the following paragraphs. The Company may accrue late fees based on the contractual terms of a lease or note. Such fees, if accrued, are included in rental income or mortgage interest income on the Company’s Consolidated Statements of Operations, based on the type of contractual agreement.
	Rental Income
	Rental income related to non-cancelable operating leases is recognized as earned over the life of the lease agreements on a straight-line basis. The Company's lease agreements generally include provisions for stated annual increases or increases based on a Consumer Price Index ("CPI"). Rental income from properties under multi-tenant office lease arrangements and rental income from properties with single-tenant lease arrangements are included in rental income on the Company's Consolidated Statements of Operations.
	The components of rental income are as follows:
		Year Ended December 31,
	(Dollars in thousands)	2014		2013		2012
	Property operating income	$	285,304	$	251,403	$	233,662
	Single-tenant net lease	65,252		51,467		42,183
	Straight-line rent	10,969		9,452		6,599
	Rental income	$	361,525	$	312,322	$	282,444
	Operating expense recoveries, included in property operating income, were approximately $53.9 million, $40.9 million and $31.9 million, respectively, for the years ended December 31, 2014, 2013 and 2012.
	Additional rent, generally defined in most lease agreements as the cumulative increase in CPI from the lease start date to the CPI as of the end of the previous year, is calculated as of the beginning of each year, and is then billed and recognized as income during the year as provided for in the lease. Included in rental income was additional rental income, net of reserves, of approximately $0.7 million for the years ended December 31, 2014, 2013 and 2012.
	Mortgage Interest Income
	Interest income on the Company’s mortgage notes receivable is recognized based on the interest rates, maturity dates and amortization periods in accordance with each note agreement. The interest rate on its one mortgage note receivable outstanding as of December 31, 2014 was fixed. The Company amortizes any fees paid related to its mortgage notes receivable to mortgage interest income over the term of the loan on a straight-line basis which approximates amortization under the effective interest method.
Other operating income	Other Operating Income
	Other operating income on the Company’s Consolidated Statements of Operations was comprised of the following:
		Year Ended December 31,
	(Dollars in thousands)	2014		2013		2012
	Property lease guaranty revenue	$	4,430	$	5,114	$	4,898
	Interest income	731		457		448
	Management fee income	289		164		158
	Other	215		191		548
		$	5,665	$	5,926	$	6,052
	Five of the Company’s 198 owned real estate properties as of December 31, 2014 were covered under property operating agreements between the Company and a sponsoring health system, which contractually obligate the sponsoring health system to provide to the Company a minimum return on the Company’s investment in the property in exchange for the right to be involved in the operating decisions of the property, including tenancy. If the minimum return is not achieved through normal operations of the property, the Company calculates and accrues to property lease guaranty revenue, each quarter, any shortfalls due from the sponsoring health systems under the terms of the property operating agreement.
	Interest income generally relates to interest on tenant improvement reimbursements as defined in each note or lease agreement.
	Management fees for property management services provided to third parties are generally calculated, accrued and billed monthly based on a percentage of cash collections of tenant receivables for the month or a stated amount per square foot. Management fees related to the Company’s owned properties are eliminated in consolidation.
Federal Income Taxes	Federal Income Taxes
	No provision has been made for federal income taxes. The Company intends at all times to qualify as a REIT under Sections 856 through 860 of the Internal Revenue Code of 1986, as amended (the “Internal Revenue Code”). The Company must distribute at least 90% per annum of its real estate investment trust taxable income to its stockholders and meet other requirements to continue to qualify as a real estate investment trust. See Note 16 for further discussion.
	The Company classifies interest and penalties related to uncertain tax positions, if any, in the Consolidated Financial Statements as a component of general and administrative expenses. No such amounts were recognized during the three years ended December 31, 2014.
	Federal tax returns for the years 2011, 2012 and 2013 are currently subject to examination by taxing authorities.
State Income Taxes	State Income Taxes
	The Company must pay certain state income taxes and the provisions for such taxes are generally included in general and administrative expense on the Company’s Consolidated Statements of Operations. See Note 16 for further discussion.
Sales and Use Taxes	Sales and Use Taxes
	The Company must pay sales and use taxes to certain state tax authorities based on rents collected from tenants in properties located in those states. The Company is generally reimbursed for these taxes by the tenant. The Company accounts for the payments to the taxing authority and subsequent reimbursement from the tenant on a net basis in revenues in the Company’s Consolidated Statements of Operations.
Discontinued Operations	Discontinued Operations
	The Company sells properties from time to time due to a variety of factors, including among other things, market conditions or the exercise of purchase options by tenants. The operating results of properties that have been sold or are held for sale are reported as discontinued operations in the Company’s Consolidated Statements of Operations for all periods presented. A company must report discontinued operations when a component of an entity has either been disposed of or is deemed to be held for sale if (i) both the operations and cash flows of the component have been or will be eliminated from ongoing operations as a result of the disposal transaction, and (ii) the entity will not have any significant continuing involvement in the operations of the component after the disposal transaction. Long-lived assets held for sale are reported at the lower of their carrying amount or their fair value less cost to sell estimate. Further, depreciation of these assets ceases at the time the assets are classified as discontinued operations. Losses resulting from the sale of such properties are characterized as impairment losses relating to discontinued operations in the Consolidated Statements of Operations. See Note 6 for more detail on discontinued operations.
Earning Per Share	Earnings per Share
	Basic earnings per common share is calculated using weighted average shares outstanding less issued and outstanding non-vested shares of common stock. Diluted earnings per common share is calculated using weighted average shares outstanding plus the dilutive effect of the outstanding stock options from the Employee Stock Purchase Plan and non-vested shares of common stock using the treasury stock method and the average stock price during the period. See Note 14 for the calculations of earnings per share.
New Accounting Pronouncements	New Accounting Pronouncements
	Accounting Standards Update No. 2014-08
	In April 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update No. 2014-08, “Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity.” This standard changes the requirements for reporting discontinued operations by raising the threshold for a disposal to qualify as a discontinued operation and requires new disclosures of both discontinued operations and certain other disposals that do not meet the definition of a discontinued operation. The standard limits discontinued operations reporting to disposals of components of an entity that represent strategic shifts that have (or will have) a major effect on an entity’s operations and financial results.
	This standard is effective for the Company on a prospective basis for annual periods beginning on January 1, 2015 and interim periods within that year. Early adoption is permitted but only for disposals (or classifications as held for sale) that have not been reported in financial statements previously issued. The Company adopted this standard on the effective date of January 1, 2015 and does not expect it to have a material impact on the Company's consolidated financial position or cash flows, but could have a material impact on the presentation of the Consolidated Statement of Operations.
	Accounting Standards Update No. 2014-09
	In May 2014, the FASB issued Accounting Standards Update No. 2014-09, "Revenue from Contracts with Customers", a comprehensive new revenue recognition standard that supersedes most all existing revenue recognition guidance, including sales of real estate. This standard's core principle is that a company will recognize revenue when it transfers goods or services to customers in amounts that reflect the consideration to which the company expects to be entitled in exchange for those goods and services. However, leasing contracts, representing the major source of the Company's revenues, are not within the scope of the new standard and will continue to be accounted for under existing standards.
	This new standard is effective for the Company for annual and interim periods beginning on January 1, 2017 with early adoption prohibited. The Company has not yet determined the effects on the Consolidated Financial Statements and related notes resulting from the adoption of this new standard.

Summary_of_Significant_Account2

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Assets' estimated useful life	Depreciation and amortization of real estate assets and liabilities in place as of December 31, 2014, is provided for on a straight-line basis over the asset’s estimated useful life:
	Land improvements	15.0 to 38.1 years
	Buildings and improvements	3.3 to 39.0 years
	Lease intangibles (including ground lease intangibles)	1.0 to 93.1 years
	Personal property	1.9 to 15.8 years
Schedule of rental income	The components of rental income are as follows:
		Year Ended December 31,
	(Dollars in thousands)	2014		2013		2012
	Property operating income	$	285,304	$	251,403	$	233,662
	Single-tenant net lease	65,252		51,467		42,183
	Straight-line rent	10,969		9,452		6,599
	Rental income	$	361,525	$	312,322	$	282,444
Other operating income	Other operating income on the Company’s Consolidated Statements of Operations was comprised of the following:
		Year Ended December 31,
	(Dollars in thousands)	2014		2013		2012
	Property lease guaranty revenue	$	4,430	$	5,114	$	4,898
	Interest income	731		457		448
	Management fee income	289		164		158
	Other	215		191		548
		$	5,665	$	5,926	$	6,052

Property_Investments_Tables

Property Investments (Tables)	12 Months Ended
	Dec. 31, 2014
Real Estate Investment Property, Net [Abstract]
Property Investment	The following table summarizes the Company’s investments.
	(Dollars in thousands)	Number of Facilities	Land		Buildings, Improvements, and Lease Intangibles		Personal Property		Total		Accumulated Depreciation
	Medical office/outpatient:
	Arizona	9	$	3,726	$	78,398	$	441	$	82,565	$	(22,521	)
	California	9	17,430		104,983		195		122,608		(53,254		)
	Colorado	9	7,197		188,593		208		195,998		(18,338		)
	District of Columbia	2	—		30,729		—		30,729		(8,992		)
	Florida	8	6,891		90,674		252		97,817		(43,774		)
	Hawaii	3	8,327		121,022		68		129,417		(17,726		)
	Illinois	3	6,142		49,194		143		55,479		(11,100		)
	Indiana	5	3,891		140,749		—		144,640		(22,575		)
	Iowa	6	12,665		81,424		94		94,183		(13,346		)
	Michigan	3	5		23,158		33		23,196		(7,644		)
	Missouri	4	4,668		32,574		7		37,249		(16,998		)
	North Carolina	16	5,096		156,538		95		161,729		(34,824		)
	Oklahoma	2	7,673		100,543		—		108,216		(1,486		)
	Tennessee	14	10,353		183,414		255		194,022		(58,932		)
	Texas	43	45,036		621,608		1,290		667,934		(145,509		)
	Virginia	13	2,451		183,340		136		185,927		(36,277		)
	Washington	8	8,974		201,227		186		210,387		(22,784		)
	Other (12 states)	16	7,248		155,992		91		163,331		(49,142		)
		173	157,773		2,544,160		3,494		2,705,427		(585,222		)
	Inpatient:
	Arizona	1	3,641		12,371		—		16,012		(1,839		)
	California	1	—		12,688		—		12,688		(6,630		)
	Colorado	1	623		10,788		—		11,411		(362		)
	Indiana	1	1,071		42,335		—		43,406		(9,227		)
	Missouri	1	1,989		109,304		—		111,293		(3,503		)
	Pennsylvania	4	6,555		74,634		—		81,189		(38,166		)
	Texas	5	9,507		158,149		265		167,921		(24,558		)
		14	23,386		420,269		265		443,920		(84,285		)
	Other:
	Alabama	1	181		9,925		8		10,114		(6,605		)
	Indiana	1	96		3,662		32		3,790		(2,477		)
	Iowa	1	—		40,263		—		40,263		(1,536		)
	Michigan	5	193		12,728		183		13,104		(8,379		)
	Tennessee	1	253		7,213		408		7,874		(2,279		)
	Virginia	2	1,178		10,031		48		11,257		(6,054		)
		11	1,901		83,822		679		86,402		(27,330		)
	Land Held for Development	—	17,054		—		—		17,054		(115		)
	Corporate Property	—	—		—		5,476		5,476		(3,719		)
		—	17,054		—		5,476		22,530		(3,834		)
	Total owned properties	198	200,114		3,048,251		9,914		3,258,279		(700,671		)
	Mortgage notes receivable	1	—		—		—		1,900		—
	Total real estate investments	199	$	200,114	$	3,048,251	$	9,914	$	3,260,179	$	(700,671	)

Real_Estate_Leases_Tables

Real Estate Leases (Tables)	12 Months Ended
	Dec. 31, 2014
Leases [Abstract]
Future minimum lease payments due to the Company under property operating agreements	Future minimum lease payments under the non-cancelable operating leases and guaranteed amounts due to the Company under property operating agreements as of December 31, 2014 are as follows (in thousands):
	2015	$	290,283
	2016	263,505
	2017	235,690
	2018	203,285
	2019	166,003
	2020 and thereafter	679,757
		$	1,838,523

Acquisitions_Dispositions_and_1

Acquisitions, Dispositions and Mortgage Repayments (Tables)	12 Months Ended
	Dec. 31, 2014
Acquisitions and Dispositions and Mortgage Repayments [Abstract]
Summary of acquisitions	A summary of the Company’s 2013 acquisitions is shown in the table below:
	(Dollars in millions)	Date		Purchase Price			Elimination of Construction Mortgage Note Receivable			Mortgage			Cash		Real		Other (3)			Square
		Acquired								Notes Payable Assumed(1)			Consideration (2)		Estate					Footage
	Real estate acquisitions
	Tennessee	1/29/13		$	16.2		$	—		$	—		$	16.2	$	15.7	$	0.5		52,225
	Texas	4/8/13		16.3			—			—			16.3		16.3		—			42,627
	Indiana	8/8/13		44.3			—			—			44.3		43.3		1			205,573
	Colorado	9/27/13		33.2			—			(12.0		)	21.2		32.9		0.3			80,153
	Missouri	9/27/13		102.6			(97.2		)	—			5.4		102.6		—			186,000
	Washington	10/18/13		34.9			—			(16.6		)	18.3		35.4		(0.5		)	81,956
	Colorado	10/24/13		21.6			—			—			21.6		21.7		(0.1		)	70,138
	North Carolina	10/30/13		20.1			—			(11.0		)	9.1		20		0.1			90,633
	Texas	12/16/13		19			—			—			19		19.1		(0.1		)	97,552
	Colorado	12/16/13		7			—			—			7		7.1		(0.1		)	34,068
				$	315.2		$	(97.2	)	$	(39.6	)	$	178.4	$	314.1	$	1.1		940,925
	______
	(1) The mortgage notes payable assumed in the acquisitions do not reflect the fair value adjustments totaling $1.4 million recorded by the Company upon acquisition (included in Other).
	(2) Cash consideration excludes non-real estate assets acquired and liabilities assumed in the acquisitions.
	(3) Includes intangibles recognized at acquisition and fair value adjustments on debt assumed.
	The following table details the Company's acquisitions for the twelve months ended December 31, 2014:
	(Dollars in millions)	Date		Purchase Price			Elimination of Mortgage Note Receivable			Mortgage			Cash		Real		Other (3)			Square
		Acquired								Notes Payable Assumed (1)			Consideration (2)		Estate					Footage
	Real estate acquisitions
	Iowa	3/28/14		$	—		$	(40.0	)	$	—		$	—	$	40.2	$	(0.2	)	152,655
	Oklahoma	5/22/14		85.4			(81.2		)	—			4.2		85.4		—			200,000
	Texas	6/4/14		8.7			—			—			8.7		8.8		(0.1		)	48,048
	North Carolina	6/6/14		6.5			—			—			6.5		6.5		—			35,292
	Minnesota	7/28/14		19.8			—			(11.4		)	8.4		20.9		(1.0		)	60,476
	Florida	9/16/14		7.9			—			—			7.9		7.9		—			47,962
	Oklahoma	10/29/14		17.5			—			(6.8		)	10.7		17.9		(0.4		)	68,860
	Washington	12/1/14		22.7			—			—			22.7		18.9		3.8			60,161
				$	168.5		$	(121.2	)	$	(18.2	)	$	69.1	$	206.5	$	2.1		673,454
	______
	(1) The mortgage notes payable assumed in the acquisitions do not reflect the fair value adjustment totaling $1.4 million recorded by the Company upon acquisition (included in Other).
	(2) Cash consideration excludes non-real estate assets acquired and liabilities assumed in the acquisitions.
	(3) Includes intangibles recognized at acquisition and fair value adjustments on debt assumed.
Summary of assets acquired and liabilities assumed	The following table summarizes the estimated fair values of the assets acquired and liabilities assumed in the real estate acquisitions for 2014 as of the acquisition date:
		Estimated Fair Value				Estimated Useful Life
		(In millions)				(In years)
	Building	181.7				11.5-39.0
	Land	12.7				—
	Intangibles:
	At-market lease intangibles	12.1				4.8-13.9
	Below-market lease intangibles	(0.4		)		3.8-6.5
	Above-market ground lease intangibles	(0.1		)		91.3
	Below-market ground lease intangibles	3.8				63.7
	Total intangibles	15.4
	Mortgage notes payable assumed, including fair value adjustments	(19.6		)
	Foreclosed mortgage note receivable	(40.0		)
	Elimination of mortgage note receivable upon acquisition	(81.2		)
	Other assets acquired	3
	Accounts payable, accrued liabilities and other liabilities assumed	(2.3		)
	Cash acquired	0.2
	Total cash paid (1)	$	69.9
	______
	(1) Total cash paid includes receivables acquired net of liabilities assumed in the acquisitions of approximately $0.8 million.
	The following table summarizes the estimated fair values of the assets acquired and liabilities assumed in the real estate acquisitions for 2013 as of the acquisition date:
		Estimated				Estimated
		Fair Value				Useful Life
		(In millions)				(In years)
	Buildings	$	280.2			7.0-39.0
	Land	21.6				—
	Personal property	0.3				1.9
	Intangibles:
	At-market lease intangibles	12				3.7-20.0
	Above-market lease intangibles	2.9				2.3-16.3
	Below-market lease intangibles	(0.4		)		0.5-7.4
	Total intangibles	14.5
	Mortgage notes payable assumed, including fair value adjustments	(41.0		)
	Elimination of mortgage note receivable upon acquisition	(97.2		)
	Other assets acquired	1.2
	Accounts payable, accrued liabilities and other liabilities assumed	(1.9		)
	Total cash paid (1)	$	177.7
	______
	(1) Total cash paid includes liabilities assumed net of receivables acquired in the acquisitions of $0.7 million.
Summary of dispositions	A summary of the Company’s 2013 dispositions follows:
	(Dollars in millions)	Date		Sales Price			Closing Adjustments			Company-financed Mortgage			Net		Net Real		Other			Gain/			Square
		Disposed								Notes			Proceeds		Estate		(including			(Impairment)			Footage
															Investment		receivables)
	Real estate dispositions
	Texas (land)	3/25/13		$	5		$	(0.2	)	$	(3.7	)	$	1.1	$	8.1	$	—		$	(3.3	)	—
	Tennessee (1)(4)	4/30/13		0.6			—			(0.6		)	—		0.4		—			0.2			17,696
	Texas	5/15/13		1.3			(0.1		)	—			1.2		0.9		—			0.3			8,000
	Texas (1)	5/24/13		3.2			(0.2		)	—			3		3		—			—			100,920
	Iowa (2) (3)	6/3/13		6.9			—			—			6.9		5.3		0.2			1.4			31,725
	Florida (1)	7/15/13		11.9			(0.2		)	—			11.7		7.4		—			4.3			62,782
	Alabama (1)	7/31/13		17.5			(0.1		)	—			17.4		11.2		—			6.2			82,000
	Pennsylvania	9/30/13		17.6			(0.3		)	—			17.3		12.2		—			5.1			76,324
	Pennsylvania	9/30/13		17.6			(0.4		)	—			17.2		12.6		—			4.6			79,560
	Florida (1)	10/31/13		0.8			—			—			0.8		0.8		—			—			14,322
	North Carolina	12/5/13		17.6			—			—			17.6		13.4		2.1			2.1			57,580
	Alabama (1)	12/31/13		1.9			—			—			1.9		1.4		—			0.5			10,593
	Total dispositions			101.9			(1.5		)	(4.3		)	96.1		76.7		2.3			21.4			541,502
	Mortgage note repayments			—			—			0.6			0.6		—		—			—			—
				$	101.9		$	(1.5	)	$	(3.7	)	$	96.7	$	76.7	$	2.3		$	21.4		541,502
	______
	-1	Previously included in assets held for sale.
	-2	Includes two properties.
	-3	The Company repaid a mortgage note payable of $1.1 million upon sale and incurred debt extinguishment costs of $0.3 million.
	-4	The Company-financed mortgage note receivable was repaid in October 2013.
	A summary of the Company's 2014 dispositions are as follows:
	(Dollars in millions)	Date		Sales Price			Closing Adjustments			Company-financed Mortgage			Net		Net Real		Other			Gain/			Square
		Disposed								Notes			Proceeds		Estate		(including			(Impairment)			Footage
															Investment		receivables)
	Real estate dispositions
	Florida (1)	4/11/14		$	1.8		$	(0.1	)	$	—		$	1.7	$	1.7	$	—		$	—		52,608
	Texas (1)	4/23/14		4.4			(0.2		)	—			4.2		4.1		0.1			—			58,365
	Nevada	9/12/14		2.3			(0.2		)	(1.9		)	0.2		4.9		—			(2.8		)	31,026
	Tennessee (2)	11/14/14		3.1			(0.2		)	—			2.9		3.2		0.1			(0.4		)	32,204
	Texas (2)	11/25/14		21.5			—			—			21.5		12.1		0.2			9.2			166,167
	Missouri (1)	12/18/14		1.3			—			—			1.3		1.4		0.1			(0.2		)	26,166
	Illinois (1)	12/29/14		0.5			—			—			0.5		0.8		—			(0.3		)	110,000
	Total dispositions			34.9			(0.7		)	(1.9		)	32.3		28.2		0.5			5.5			476,536
	Mortgage note repayments			—			—			4.9			4.9		—		—			—			—
				$	34.9		$	(0.7	)	$	3		$	37.2	$	28.2	$	0.5		$	5.5		476,536
	______
	(1) Previously included in assets held for sale.
	(2) Includes two properties.

Mortgage_Notes_Receivable_Tabl

Mortgage Notes Receivable (Tables)	12 Months Ended
	Dec. 31, 2014
Receivables [Abstract]
Summary of mortgage notes receivable	A summary of the Company’s mortgage notes receivable for the years ended December 31, 2014 and 2013 is shown in the table below:
								Balance as of December 31,
	State	Property Type (1)	Face Amount		Interest Rate		Maturity Date	2014		2013
	(dollars in thousands)
	Construction mortgage notes:
	Oklahoma	MOB	$	94,889	7.72	%	9/30/14	$	—	$	79,969
	Total construction mortgage notes							—		79,969
	Other mortgage notes:
	Iowa	Other	40,000		7.7	%	1/10/14	—		39,973
	Florida	MOB	3,750		7.5	%	4/10/15	—		3,750
	Texas	Land	3,666		5.00%-6.00%		3/25/15	—		1,855
	Nevada	MOB	1,900		6.5	%	9/30/17	1,900		—
	Total other mortgage notes							1,900		45,578
	Total mortgage notes receivable							$	1,900	$	125,547
	______
	(1) MOB - Medical office building.

Discontinued_Operations_Tables

Discontinued Operations (Tables)	12 Months Ended
	Dec. 31, 2014
Discontinued Operations and Disposal Groups [Abstract]
Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures	The tables below reflect the assets and liabilities of the properties classified as held for sale and discontinued operations as of December 31, 2014 and 2013 and the results of operations of the properties included in discontinued operations on the Company’s Consolidated Statements of Operations for the years ended December 31, 2014, 2013 and 2012.
		December 31,
	(Dollars in thousands)	2014			2013
	Balance Sheet data (as of the period ended):
	Land	$	422		$	1,578
	Buildings, improvements and lease intangibles	12,822			15,400
	Personal property	13			—
		13,257			16,978
	Accumulated depreciation	(4,464		)	(10,211		)
	Assets held for sale, net	8,793			6,767
	Other assets, net (including receivables)	353			85
	Assets of discontinued operations, net	353			85
	Assets held for sale and discontinued operations, net	$	9,146		$	6,852
	Accounts payable and accrued liabilities	$	86		$	1,091
	Other liabilities	286			21
	Liabilities of discontinued operations	$	372		$	1,112
		Year Ended December 31,
	(Dollars in thousands, except per share data)	2014			2013			2012
	Statements of Operations data:
	Revenues (1)
	Rental income	$	5,660		$	14,202		$	24,290
	Other operating	4			9			69
		5,664			14,211			24,359
	Expenses (2)
	Property operating	3,126			4,830			6,894
	General and administrative	19			26			33
	Depreciation	1,551			3,794			6,888
	Amortization	—			63			147
	Bad debt, net of recoveries	3			13			10
		4,699			8,726			13,972
	Other Income (Expense) (3)
	Loss on extinguishment of debt	—			(270		)	—
	Interest expense	—			(40		)	(97		)
	Interest and other income, net	2			71			171
		2			(239		)	74
	Income from Discontinued Operations	967			5,246			10,461
	Impairments (4)	(12,029		)	(9,889		)	(14,908		)
	Gain on sales of real estate properties (5)	9,283			24,718			10,874
	Income (Loss) from Discontinued Operations	$	(1,779	)	$	20,075		$	6,427
	Income (Loss) from Discontinued Operations per Common Share - Basic	$	(0.02	)	$	0.22		$	0.08
	Income (Loss) from Discontinued Operations per Common Share - Diluted	$	(0.02	)	$	0.22		$	0.08
	______
	-1	Total revenues for the years ended December 31, 2014, 2013 and 2012 included $4.3 million, $12.6 million and $22.2 million, respectively, related to properties sold; and $1.4 million, $1.6 million and $2.2 million, respectively, related to two properties held for sale as of December 31, 2014.
	-2	Total expenses for the years ended December 31, 2014, 2013 and 2012 included $4.7 million, $8.7 million and $13.5 million, respectively, related to properties sold; and for the year ended December 31, 2012 included $0.5 million related to two properties held for sale as of December 31, 2014.
	-3	Other income (expense) for the years ended December 31, 2014, 2013, and 2012 included income (expense) related to properties sold.
	-4	Impairments for the year ended December 31, 2014 included $3.7 million in connection with the sale of three properties and $8.3 million on two properties in held for sale and two properties there were reclassified to held for sale during 2014. All four properties of these were subsequently sold; December 31, 2013 included the following: $3.3 million related to the sale of a land parcel; $0.4 million related to two properties classified as held for sale and subsequently sold for a gain; and $6.2 million related to three properties held for sale; and December 31, 2012 included $11.1 million related to 12 properties sold and $3.8 million related to one properties held for sale.
	-5	Gain on sales of real estate properties for the years ended December 31, 2014, 2013 and 2012 included gains on the sale of three, 12 and seven properties, respectively.

Other_Assets_Tables

Other Assets (Tables)	12 Months Ended
	Dec. 31, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Items included in other assets	Other assets consist primarily of straight-line rent receivables, prepaids, intangible assets, deferred financing costs and receivables. Items included in "Other assets, net" on the Company’s Consolidated Balance Sheets as of December 31, 2014 and 2013 are detailed in the table below:
		December 31,
	(Dollars in millions)	2014			2013
	Prepaid assets	$	61.4		$	55.3
	Straight-line rent receivables	52.6			42.2
	Above-market intangible assets, net	17.3			14.4
	Additional long-lived assets, net	14.4			15.9
	Ground lease modification, net	11.7			—
	Deferred financing costs, net	9.9			11.7
	Accounts receivable	8.7			7
	Allowance for uncollectible accounts	(0.5		)	(0.5		)
	Goodwill	3.5			3.5
	Customer relationship intangible assets, net	1.9			2
	Other	4.4			2
		$	185.3		$	153.5

Intangible_Assets_and_Liabilit1

Intangible Assets and Liabilities (Tables)	12 Months Ended
	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of finite lived intangible assets and liabilities	The Company’s intangible assets and liabilities as of December 31, 2014 and 2013 consisted of the following:
		Gross Balance at December 31,						Accumulated Amortization at December 31,						Weighted	Balance Sheet
														Avg. Remaining Life	Classification
	(Dollars in millions)	2014			2013			2014			2013			(Years)
	Goodwill	$	3.5		$	3.5		$	—		$	—		N/A	Other assets
	Deferred financing costs	17.6			16.4			7.7			4.7			4.3	Other assets
	Above-market lease intangibles	21.1			17.3			3.8			2.9			52.7	Other assets
	Customer relationship intangibles	2.6			2.6			0.7			0.6			28.6	Other assets
	Below-market lease intangibles	(9.2		)	(8.9		)	(4.8		)	(4.1		)	14.3	Other liabilities
	At-market lease intangibles	130.7			118.6			86.9			76.2			7.2	Real estate properties
		$	166.3		$	149.5		$	94.3		$	80.3		17
Schedule of expected net future amortization expense	The following table represents expected amortization of the Company’s intangible assets and liabilities, in place as of December 31, 2014:
	(Dollars in millions)	Future Amortization of Intangibles, net
	2015	$	12.4
	2016	$	11.4
	2017	$	8.3
	2018	$	6.5
	2019	$	4.9

Notes_and_Bonds_Payable_Tables

Notes and Bonds Payable (Tables)	12 Months Ended
	Dec. 31, 2014
Debt Instrument [Line Items]
Schedule of debt	The table below details the Company’s notes and bonds payable.
		December 31,						Maturity		Contractual			Principal		Interest
	(Dollars in thousands)	2014			2013			Dates		Interest Rates			Payments		Payments
	Unsecured Credit Facility	$	85,000		$	238,000		17-Apr		LIBOR + 1.40%			At maturity		Quarterly
	Unsecured Term Loan Facility	200,000			—			19-Feb		LIBOR + 1.45%			At maturity		Quarterly
	Senior Notes due 2017, net of discount	299,308			299,008			17-Jan		6.5	%		At maturity		Semi-Annual
	Senior Notes due 2021, net of discount	397,864			397,578			21-Jan		5.75	%		At maturity		Semi-Annual
	Senior Notes due 2023, net of discount	248,253			248,077			23-Apr		3.75	%		At maturity		Semi-Annual
	Mortgage notes payable, net of discounts and including premiums	173,267			165,796			5/15-5/40		5.00%-7.63%			Monthly		Monthly
		$	1,403,692		$	1,348,459
Schedule of Mortgage Notes Payable	The following table details the Company’s mortgage notes payable, with related collateral.
		Original Balance			Effective			Maturity		Collateral		Principal and Interest			Investment in Collateral at December 31,		Balance at December 31,
					Interest			Date		-22		Payments (20)
					Rate
	(Dollars in millions)				-21										2014		2014		2013
	Life Insurance Co.	$	4.7		7.77	%		17-Jan		MOB		Monthly/20-yr amort.			$	12.1	$	0.9	$	1.2
	Commercial Bank	1.8			5.55	%		30-Oct		OTH		Monthly/27-yr amort.			7.9		1.5		1.5
	Life Insurance Co.	15.1			5.49	%		16-Jan		MOB		Monthly/10-yr amort.			36.1		11.9		12.3
	Commercial Bank (1)	17.4			6.48	%		15-May		MOB		Monthly/10-yr amort.			20.2		14.8		14.7
	Commercial Bank (2)	12			6.11	%		15-Jul		2 MOBs		Monthly/10-yr amort.			19.4		10.1		10
	Commercial Bank (3)	15.2			7.65	%		20-Jul		MOB		(19	)		20.2		12.7		12.7
	Commercial Bank (4)	12.9			6.43	%		21-Feb		MOB		Monthly/12-yr amort.			20.7		11		11.1
	Life Insurance Co.	7			5.53	%		18-Jan		MOB		Monthly/15-yr amort.			14.9		1.9		2.5
	Investment Co.	4.6			5.25	%		15-Sep		MOB		Monthly/10-yr amort.			6.5		4.1		4.2
	Life Insurance Co. (5)	13.9			4.7	%		16-Jan		MOB		Monthly/25-yr amort.			26.7		11		11.5
	Life Insurance Co. (6)	21.5			4.7	%		15-Aug		MOB		Monthly/25-yr amort.			41.5		16.6		17.4
	Insurance Co. (7)	7.3			5.1	%		18-Dec		MOB		Monthly/25-yr amort.			13.7		6.8		7
	Commercial Bank (8)	8.1			4.54	%		16-Aug		MOB		Monthly/10-yr amort.			15.7		7.5		7.6
	Life Insurance Co. (9)	5.3			4.06	%		14-Nov		MOB		Monthly/25-yr amort.			—		—		4.3
	Life Insurance Co. (10)	3.1			4.06	%		14-Nov		MOB		Monthly/25-yr amort.			—		—		2.5
	Life Insurance Co. (11)	7.9			4	%		20-Aug		MOB		Monthly/15-yr amort.			20.7		4		4.6
	Commercial Bank (12)	15			5.25	%		27-Apr		MOB		Monthly/20-yr amort			33.4		11.9		12.5
	Commercial Bank (13)	18.3			5	%		16-Dec		MOB		Monthly/30-yr amort			33.6		16.5		17
	Commercial Bank (14)	13.1			5	%		16-Apr		MOB		Monthly/25-yr amort			20.1		10.7		11.2
	Life Insurance Co. (15)	7.3			4.86	%		20-Aug		MOB		Monthly/27-yr amort			17.8		7.1		—
	Municipal Government (16) (17)	11.9			4.79	%		-18		MOB		Semi-Annual (18)			20.9		12.3		—
															$	402.1	$	173.3	$	165.8
	______
	-1	The unaccreted portion of a $2.7 million discount recorded on this note upon acquisition is included in the balance above.
	-2	The unaccreted portion of a $2.1 million discount recorded on this note upon acquisition is included in the balance above.
	-3	The unaccreted portion of a $2.4 million discount recorded on this note upon acquisition is included in the balance above.
	-4	The unaccreted portion of a $1.0 million discount recorded on this note upon acquisition is included in the balance above.
	-5	The unamortized portion of a $0.3 million premium recorded on this note upon acquisition is included in the balance above.
	-6	The unamortized portion of a $0.4 million premium recorded on this note upon acquisition is included in the balance above.
	-7	The unamortized portion of the $0.6 million premium recorded on this note upon acquisition is included in the balance above.
	-8	The unamortized portion of the $0.5 million premium recorded on this note upon acquisition is included in the balance above.
	-9	Balance consists of two notes secured by the same building. The company repaid these notes in October 2014.
	-10	The company repaid this mortgage note in October 2014.
	-11	The unamortized portion of the $0.3 million premium recorded on this note upon acquisition is included in the balance above.
	-12	The unamortized portion of the $0.7 million premium recorded on this note upon acquisition is included in the balance above.
	-13	The unamortized portion of the $0.5 million premium recorded on this note upon acquisition is included in the balance above.
	-14	The unamortized portion of the $0.2 million premium recorded on this note upon acquisition is included in the balance above.
	-15	The unamortized portion of the $0.4 million premium recorded on this note upon acquisition is included in the balance above.
	-16	Balance consists of four notes secured by the same building.
	-17	The unamortized portion of the $1.0 million premium recorded on the four notes upon acquisition is included in the balance above.
	-18	These four mortgage notes payable are series municipal bonds that have maturity dates ranging from from May 2017 to May 2040. The note payable with the earliest maturity date will require principal and interest payments while the remaining notes payable will require interest only payments. One of the notes payable matures in May 2017 and the remaining three have future maturity dates but allow repayment in May 2020 without penalty. The Company intends on repaying all three notes payable at that time.
	-19	Payable in monthly installments of interest only for 24 months and then installments of principal and interest based on an 11-year amortization with the final payment due at maturity.
	-20	Payable in monthly installments of principal and interest with the final payment due at maturity (unless otherwise noted).
	-21	The contractual interest rates for the 22 outstanding mortgage notes ranged from 5.0% to 7.6% as of December 31, 2014.
	-22	MOB-Medical office building; OTH-Other.
Future contractual maturities of the Company's notes and bonds payable	Future maturities of the Company’s notes and bonds payable as of December 31, 2014 were as follows:
	(Dollars in thousands)	Principal			Net Accretion/				Notes and Bonds Payable				%
		Maturities			Amortization (1)
	2015	$	50,826		$	(624	)		$	50,202			3.6	%
	2016	58,698			(473		)		58,225				4.1	%
	2017	388,181			(473		)		387,708				27.6	%
	2018	8,420			(496		)		7,924				0.6	%
	2019	202,633			(636		)		201,997				14.4	%
	2020 and thereafter	698,772			(1,136		)		697,636				49.7	%
		$	1,407,530		$	(3,838	)		$	1,403,692			100	%
	______
	-1	Includes discount accretion and premium amortization related to the Company’s Senior Notes due 2017, Senior Notes due 2021, Senior Notes due 2023, and 17 mortgage notes payable.
Senior Notes [Member] | 6.500% Senior Notes Due 2017 [Member]
Debt Instrument [Line Items]
Schedule of debt	The following table reconciles the balance of the Senior Notes due 2017 on the Company’s Consolidated Balance Sheets as of December 31, 2014 and 2013.
		December 31,
	(Dollars in thousands)	2014			2013
	Senior Notes due 2017 face value	$	300,000		$	300,000
	Unaccreted discount	(692		)	(992		)
	Senior Notes due 2017 carrying amount	$	299,308		$	299,008
Senior Notes [Member] | 5.750% Senior Notes Due 2021 [Member]
Debt Instrument [Line Items]
Schedule of debt	The following table reconciles the balance of the Senior Notes due 2021 on the Company’s Consolidated Balance Sheets as of December 31, 2014 and 2013.
		December 31,
	(Dollars in thousands)	2014			2013
	Senior Notes due 2021 face value	$	400,000		$	400,000
	Unaccreted discount	(2,136		)	(2,422		)
	Senior Notes due 2021 carrying amount	$	397,864		$	397,578
Senior Notes [Member] | 3.75% Senior Notes Due 2023 [Member]
Debt Instrument [Line Items]
Schedule of debt	The following table reconciles the balance of the Senior Notes due 2023 on the Company’s Consolidated Balance Sheets as of December 31, 2014.
		December 31,
	(Dollars in thousands)	2014			2013
	Senior Notes due 2023 face value	$	250,000		$	250,000
	Unaccreted discount	(1,747		)	(1,923		)
	Senior Notes due 2023 carrying amount	$	248,253		$	248,077
Mortgage notes payable [Member] | 5.000%-7.63% Mortgage Notes Payable [Member]
Debt Instrument [Line Items]
Schedule of debt	The following table reconciles the Company’s aggregate mortgage notes principal balance with the Company’s Consolidated Balance Sheets as of December 31, 2014 and 2013. For the years ended December 31, 2014, 2013 and 2012, the Company amortized approximately $1.1 million, $1.2 million and $1.0 million of the discount and $1.0 million, $0.7 million, and $0.7 million of the premium, respectively, on the mortgage notes payable which is included in interest expense on the Company’s Consolidated Statement of Operations.
		December 31,
	(Dollars in thousands)	2014			2013
	Mortgage notes payable principal balance	$	172,530		$	166,684
	Unamortized premium	3,205			2,708
	Unaccreted discount	(2,468		)	(3,596		)
	Mortgage notes payable carrying amount	$	173,267		$	165,796

Stockholders_Equity_Tables

Stockholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2014
Equity [Abstract]
Reconciliation of the beginning and ending common stock outstanding	The Company had no preferred shares outstanding and had common shares outstanding for the three years ended December 31, 2014 as follows:
		Year Ended December 31,
		2014			2013			2012
	Balance, beginning of year	95,924,339			87,514,336			77,843,883
	Issuance of common stock	3,073,445			8,293,369			9,275,895
	Non-vested stock-based awards, net of withheld shares and forfeitures	(169,686	)		116,634			394,558
	Balance, end of year	98,828,098			95,924,339			87,514,336
Schedule of sale of stock under market equity offering Program	The following table details the shares sold under this program.
				Shares Sold			Sales Price Per Share		Net Proceeds
									(in millions)
	2014	2,099,380		3,009,761			$24.35 - $27.53		$	75.7
	2013	5,207,871		5,207,871			$24.19 - $30.49		$	140.6
Change in ownership interest in less-than-wholly-owned subsidiary	The following schedule discloses the effects of changes in the Company's ownership interest in its less-than-wholly-owned subsidiary on the Company's stockholders' equity:
			Year Ended December 31,
	(Dollars in thousands)		2014				2013				2012
	Net income attributable to common stockholders		$	31,887			$	6,946			$	5,465
	Transfers to noncontrolling interest:
	Net decrease in the Company's additional paid-in capital for purchase of subsidiary partnership interest		(6,577		)		—				—
	Net transfers to the noncontrolling interest		(6,577		)		—				—
	Change to the Company's total stockholders' equity from net income attributable to common stockholders and transfers to noncontrolling interest		$	25,310			$	6,946			$	5,465
Reconciliation of beginning and ending balances of accumulated other comprehensive income	The following table represents the amounts reclassified out of Accumulated other comprehensive income (loss) related to the Company's pension plan during the years ended December 31, 2014 and 2013:
		Year Ended December 31,
	(Dollars in thousands)	2014				2013
	Beginning balance	$	51			$	(2,092	)
	Other comprehensive income (loss) before reclassifications	(1,850		)		1,952
	Amounts reclassified from accumulated other comprehensive income (loss)	(720		)		191
	Net current-period other comprehensive income (loss)	(2,570		)		2,143
	Ending balance	$	(2,519	)		$	51
Reclassifications out of accumulated other comprehensive income	The following table represents the details regarding the reclassifications from Accumulated other comprehensive income (loss) related to the Company's pension plan during the years ended December 31, 2014:
	Details about accumulated other comprehensive income (loss) components		Amount reclassified from accumulated other comprehensive income (loss)				Affected line item in the statement where net income is presented
	(Dollars in thousands)
	Prior service costs		$	(1,189	)		General and administrative expenses
	Actuarial loss		469				General and administrative expenses
			$	(720	)

Benefit_Plans_Tables

Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]
Net periodic benefit cost for both the Executive Retirement Plan and the Outside Director Plan	Net periodic benefit cost for the Executive Retirement Plan for the three years in the period ended December 31, 2014 is comprised of the following:
		Year Ended December 31,
	(Dollars in thousands)	2014				2013			2012
	Service cost	$	88			$	86		$	77
	Interest cost	687				597			725
	Amortization of prior service cost	(1,189		)		(1,189		)	(723		)
	Amortization of net gain	469				1,380			990
		55				874			1,069
	Net (gain) loss recognized in Accumulated other comprehensive income (loss)	2,570				(2,143		)	(1,240		)
	Total recognized in net periodic benefit gain and Accumulated other comprehensive income (loss)	$	2,625			$	(1,269	)	$	(171	)
Change in benefit obligation	The following table sets forth the benefit obligations as of December 31, 2014 and 2013.
		Year Ended December 31,
	(Dollars in thousands)	2014				2013
	Benefit obligation at beginning of year	$	13,890			$	15,201
	Service cost	88				86
	Interest cost	687				597
	Benefits paid	(42		)		(42		)
	Actuarial (gain) loss, net	1,850				(1,952		)
	Benefit obligation at end of year	$	16,473			$	13,890
Amounts recognized in the Consolidated Balance Sheets	Amounts recognized in the Consolidated Balance Sheets are as follows:
		Year Ended December 31,
	(Dollars in thousands)	2014				2013
	Net liabilities included in other liabilities	$	(13,954	)		$	(13,941	)
	Amounts recognized in accumulated other comprehensive income (loss)	(2,519		)		51
Schedule of assumptions used	The Company's assumed discount rates and compensation increases, which are used to measure the year-end benefit obligations and earnings for the subsequent year related to the Executive Retirement Plan are detailed in the following table for the three years ended December 31, 2014:
		2014		2013		2012
	Discount rates	4.08	%	4.92	%	3.91	%
	Compensation increases	2.7	%	2.7	%	2.7	%

Stock_and_Other_Incentive_Plan1

Stock and Other Incentive Plans (Tables)	12 Months Ended
	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Summary of the activity under the Incentive Plan the previous directors' plan	A summary of the activity under the Incentive Plan and related information for the three years in the period ended December 31, 2014 follows:
		Year Ended December 31,
		2014				2013				2012
	Stock-based awards, beginning of year	1,788,168				1,770,061				1,430,675
	Granted	269,129				134,752				397,917
	Vested	(931,767		)		(116,645		)		(58,531		)
	Forfeited	(67,798		)		—				—
	Stock-based awards, end of year	1,057,732				1,788,168				1,770,061
	Weighted-average grant date fair value of:
	Stock-based awards, beginning of year	$	23.81			$	23.97			$	24.42
	Stock-based awards granted during the year	$	25.27			$	23.9			$	22.35
	Stock-based awards vested during the year	$	24.13			$	26.35			$	23.99
	Stock-based awards forfeited during the year	$	22.01			$	—			$	—
	Stock-based awards, end of year	$	24.01			$	23.81			$	23.97
	Grant date fair value of shares granted during the year	$	6,800,122			$	3,220,623			$	8,894,424
Summary of the Employee Stock Purchase Plan activity	A summary of the Employee Stock Purchase Plan activity and related information for the three years in the period ended December 31, 2014 is as follows:
		Year Ended December 31,
		2014				2013				2012
	Options outstanding, beginning of year	391,108				433,452				425,196
	Granted	275,655				246,717				327,936
	Exercised	(51,078		)		(69,076		)		(59,163		)
	Forfeited	(63,908		)		(49,434		)		(78,202		)
	Expired	(157,875		)		(170,551		)		(182,315		)
	Options outstanding and exercisable, end of year	393,902				391,108				433,452
	Weighted-average exercise price of:
	Options outstanding, beginning of year	$	17.05			$	16.78			$	15.8
	Options granted during the year	$	18.11			$	20.41			$	15.8
	Options exercised during the year	$	17.76			$	17.09			$	16.18
	Options forfeited during the year	$	18.58			$	17.98			$	16.74
	Options expired during the year	$	15.8			$	17.99			$	18.24
	Options outstanding, end of year	$	19.17			$	17.05			$	16.78
	Weighted-average fair value of options granted during the year (calculated as of the grant date)	$	4.35			$	5.08			$	4.13
	Intrinsic value of options exercised during the year	$	436,547			$	375,335			$	439,645
	Intrinsic value of options outstanding and exercisable (calculated as of December 31)	$	3,209,456			$	1,665,331			$	3,132,506
	Exercise prices of options outstanding (calculated as of December 31)	$	19.17			$	17.05			$	16.78
	Weighted-average contractual life of outstanding options (calculated as of December 31, in years)	0.8				0.8				0.8
Fair value of options issued based on weighted-average assumptions
		2014			2013			2012
	Risk-free interest rates	0.38	%		0.25	%		0.25	%
	Expected dividend yields	4.94	%		5.17	%		6.17	%
	Expected life (in years)	1.39			1.35			1.46
	Expected volatility	23	%		25.6	%		30.3	%
	Expected forfeiture rates	75	%		85	%		70	%

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Earnings per share	The table below sets forth the computation of basic and diluted earnings per common share for the three years in the period ended December 31, 2014.
		Year Ended December 31,
	(Dollars in thousands, except per share data)	2014			2013			2012
	Weighted Average Common Shares
	Weighted average Common Shares outstanding	97,093,960			92,725,112			80,360,422
	Non-vested shares	(1,814,734		)	(1,784,485		)	(1,515,582		)
	Weighted average Common Shares - Basic	95,279,226			90,940,627			78,844,840
	Weighted average Common Shares - Basic	95,279,226			90,940,627			78,844,840
	Dilutive effect of non-vested shares	1,364,236			—			—
	Dilutive effect of employee stock purchase plan	115,948			—			—
	Weighted average Common Shares - Diluted	96,759,410			90,940,627			78,844,840
	Net Income (loss)
	Income (loss) from continuing operations	$	33,979		$	(13,092	)	$	(892	)
	Noncontrolling interests’ share in earnings	(313		)	(37		)	(70		)
	Income (loss) from continuing operations attributable to common stockholders	33,666			(13,129		)	(962		)
	Discontinued operations	(1,779		)	20,075			6,427
	Net income attributable to common stockholders	$	31,887		$	6,946		$	5,465
	Basic Earnings (loss) Per Common Share
	Income (loss) from continuing operations	$	0.35		$	(0.14	)	$	(0.01	)
	Discontinued operations	(0.02		)	0.22			0.08
	Net income attributable to common stockholders	$	0.33		0.08			0.07
	Diluted Earnings (loss) Per Common Share
	Income (loss) from continuing operations	$	0.35		$	(0.14	)	$	(0.01	)
	Discontinued operations	(0.02		)	0.22			0.08
	Net income attributable to common stockholders	$	0.33		$	0.08		$	0.07

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Minimum lease payments for its operating leases	The Company’s future minimum lease payments for its operating leases, excluding leases that the Company has prepaid and leases in which an operator pays or fully reimburses the Company, as of December 31, 2014 were as follows (in thousands):
	2015	$	5,001
	2016	5,070
	2017	5,129
	2018	5,154
	2019	5,250
	2020 and thereafter	286,699
		$	312,303

Other_Data_Tables

Other Data (Tables)	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Taxable Income	The following table reconciles the Company’s consolidated net income attributable to common stockholders to taxable income for the three years ended December 31, 2014:
		Year Ended December 31,
	(Dollars in thousands)	2014			2013				2012
	Net income attributable to common stockholders	$	31,887		$	6,946			$	5,465
	Reconciling items to taxable income:
	Depreciation and amortization	28,332			26,240				28,526
	Gain or loss on disposition of depreciable assets	(4,940		)	(3,656		)		922
	Impairments	—			6,222				3,807
	Straight-line rent	(12,203		)	(6,493		)		(6,075		)
	Receivable allowances	2,074			(716		)		(74		)
	Stock-based compensation	2,020			5,817				5,400
	Other	1,213			(1,866		)		8,917
		16,496			25,548				41,423
	Taxable income (1)	$	48,383		$	32,494			$	46,888
	Dividends paid	$	116,371		$	111,571			$	96,356
	______
	(1) Before REIT dividend paid deduction
Characterization of distributions on common stock	For the three years ended December 31, 2014, there were no preferred shares outstanding. As such, no dividends were distributed related to preferred shares for those periods.
		2014						2013						2012
		Per Share			%			Per Share				%		Per Share		%
	Common stock:
	Ordinary income	$	0.5		42	%		$	0.27			22.2	%	$	0.63	52.3	%
	Return of capital	0.7			58	%		0.8				66.3	%	0.56		47.1	%
	Unrecaptured section 1250 gain	—			—	%		0.13				11.5	%	0.01		0.6	%
	Common stock distributions	$	1.2		100	%		$	1.2			100	%	$	1.2	100	%
State Income Taxes	State income tax expense and state income tax payments for the three years ended December 31, 2014 are detailed in the table below:
		Year Ended December 31,
	(Dollars in thousands)	2014			2013				2012
	State income tax expense:
	Texas gross margins tax (1)	$	694		$	649			$	843
	Other	58			23				3
	Total state income tax expense	$	752		$	672			$	846
	State income tax payments, net of refunds and collections	$	593		$	768			$	627
	______
	-1	In the table above, income tax expense for 2014 and 2012 includes approximately $0.1 million that was recorded to the gain on sale of real estate properties sold, which is included in discontinued operations rather than general and administrative expenses on the Company’s Consolidated Statements of Operations.

Fair_Value_of_Financial_Instru1

Fair Value of Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Fair value and carrying values for notes and bonds payable, mortgage notes receivable and notes receivable	The table below details the fair value and carrying values for notes and bonds payable, mortgage notes receivable and notes receivable as of December 31, 2014 and 2013.
		December 31, 2014				December 31, 2013
	(Dollars in millions)	Carrying		Fair		Carrying		Fair
		Value		Value		Value		Value
	Notes and bonds payable (1)	$	1,403.70	$	1,438.80	$	1,348.50	$	1,380.60
	Mortgage notes receivable (2)	$	1.9	$	1.9	$	125.5	$	124.5
	______
	(1) Level 3 - Fair value derived from valuation techniques in which one of more significant inputs or significant value drivers are unobservable.
	(2) Level 2 - Fair value based on quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-driven valuations in which significant inputs and significant value drivers are observable in active markets.

Selected_Quarterly_Financial_D1

Selected Quarterly Financial Data (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2014
Selected Quarterly Financial Information [Abstract]
Summary of quarterly financial information	Quarterly financial information for the year ended December 31, 2014 is summarized below. The results of operations have been restated, as applicable, to show the effect of reclassifying properties sold or to be sold as discontinued operations.
		Quarter Ended
	(Dollars in thousands, except per share data)	March 31 (1)			June 30 (2)			September 30 (3)			December 31 (4)
	2014
	Revenues from continuing operations	$	90,571		$	91,671		$	93,612		$	95,001
	Income from continuing operations	7,477			9,005			8,437			9,060
	Discontinued operations	(3,514		)	(2,994		)	(4,284		)	9,013
	Net income	3,963			6,011			4,153			18,073
	Less: (Income) from noncontrolling interests	(111		)	(40		)	(162		)	—
	Net income attributable to common stockholders	$	3,852		$	5,971		$	3,991		$	18,073
	Net income attributable to common stockholders per share:
	Basic earnings per common share	$	0.04		$	0.06		$	0.04		$	0.19
	Diluted earnings per common share	$	0.04		$	0.06		$	0.04		$	0.18
	______
	(1) The decreases in net income and amounts per share for the first quarter of 2014 are primarily attributable to impairment charges of $3.4 million.
	(2) The increases in net income and amounts per share for the second quarter of 2014 are primarily attributable to a $1.9 million cash reimbursement received by the Company for certain operating expenses paid by the Company for years 2006 through 2013.
	(3) The decreases in net income and amounts per share for the third quarter of 2014 are primarily attributable to impairment charges of $4.5 million.
	(4) The increases in net income and amounts per share for the fourth quarter of 2014 are primarily attributable to gains on sales of real estate totaling $9.3 million, partially offset by impairment charges of $1.0 million.
	Quarterly financial information for the year ended December 31, 2013 is summarized below. The results of operations have been restated, as applicable, to show the effect of reclassifying properties sold or to be sold as discontinued operations.
		Quarter Ended
	(Dollars in thousands, except per share data)	March 31 (1)			June 30 (2)			September 30 (3)			December 31 (4)
	2013
	Revenues from continuing operations	$	78,970		$	80,552		$	82,805		$	88,622
	Income (loss) from continuing operations	602			(27,861		)	4,511			9,656
	Discontinued operations	(1,620		)	3,623			15,272			2,800
	Net income (loss)	(1,018		)	(24,238		)	19,783			12,456
	Less: (Income) loss from noncontrolling interests	19			33			(17		)	(72		)
	Net income (loss) attributable to common stockholders	$	(999	)	$	(24,205	)	$	19,766		$	12,384
	Net income attributable to common stockholders per share:
	Basic earnings (loss) per common share	$	(0.01	)	$	(0.27	)	$	0.21		$	0.13
	Diluted earnings (loss) per common share	$	(0.01	)	$	(0.27	)	$	0.21		$	0.13
	______
	(1) The decreases in net income and amounts per share for the first quarter of 2013 are primarily attributable to impairment charges of $3.6 million.
	(2) The decreases in net income and amounts per share for the second quarter of 2013 are primarily attributable to losses of extinguishment of debt of $29.9 million, of which $0.3 million is included in discontinued operations. This amount is partially offset by gains on sales of real estate totaling $1.8 million.
	(3) The increases in net income and amounts per share for the third quarter of 2013 are primarily attributable to gains on sales of real estate totaling $20.2 million, partially offset by impairment charges of $6.3 million.
	(4) The increases in net income and amounts per share for the fourth quarter of 2013 are primarily attributable to gains on sales of real estate totaling $2.7 million.

Summary_of_Significant_Account3

Summary of Significant Accounting Policies - Useful lives of real estate assets and liabilities (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Land improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Asset estimated useful life	15 years
Land improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Asset estimated useful life	38 years 1 month 6 days
Building and improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Asset estimated useful life	3 years 3 months 18 days
Building and improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Asset estimated useful life	39 years
Lease intangibles (including ground lease intangibles) [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Asset estimated useful life	1 year
Intangible asset useful life	1 year
Lease intangibles (including ground lease intangibles) [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Asset estimated useful life	93 years 1 month 6 days
Intangible asset useful life	93 years 1 month 6 days
Personal property [Member]
Property, Plant and Equipment [Line Items]
Asset estimated useful life		1 year 10 months 24 days
Personal property [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Asset estimated useful life	1 year 10 months 24 days
Personal property [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Asset estimated useful life	15 years 9 months 18 days

Summary_of_Significant_Account4

Summary of Significant Accounting Policies - Components of rental income (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounting Policies [Abstract]
Property operating income	$285,304	$251,403	$233,662
Single-tenant net lease	65,252	51,467	42,183
Straight-line rent	10,969	9,452	6,599
Rental income	$361,525	$312,322	$282,444

Summary_of_Significant_Account5

Summary of Significant Accounting Policies - Components of other operating income (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Other Operating Income [Abstract]
Property lease guaranty revenue	$4,430	$5,114	$4,898
Interest income	731	457	448
Management fee income	289	164	158
Other	215	191	548
Other operating	$5,665	$5,926	$6,052

Summary_of_Significant_Account6

Summary of Significant Accounting Policies - Narrative (Details) (USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011	Jan. 31, 2014
	employee
	property
	mortgage_note_receivable
	sqft
	state
Business Overview [Abstract]
Gross investment, amount, total	$3,300,000,000
Real estate properties and mortgages	199
Number of owned real estate properties	198
Number of states that the Company owns real estate in	30
Square footage of owned real estate properties	14,200,000
Approximate square feet for which Nationwide property management services provided by company	9,500,000
Principles of Consolidation [Abstract]
Aggregate amount of construction mortgage loans	1,900,000
Real Estate Properties [Abstract]
Total real estate properties	3,258,279,000		3,067,187,000
Maximum period up to which interest capitalize on properties in stabilization	1 year
Land Held for Development [Abstract]
Land held for development	17,100,000		17,100,000
Fair Value Measurements [Abstract]
Number of impaired properties sold	6
Other asset impairment charges	3,700,000
Impairment charges on Assets classified as held for sale	8,300,000
Number of Properties Reclassified to Held For Sale	2
Number of Held for Sale Properties Sold	4
Mortgage Notes and Notes Receivable [Abstract]
Mortgage notes receivable	1,900,000	[1]	125,547,000	[1]	162,191,000	97,381,000
Goodwill and Intangible Assets [Abstract]
Goodwill	3,487,000		3,487,000
Goodwill, Impairment Loss	0		0
Defined Benefit Pension Plans [Abstract]
Number of employees covered by the Company's pension plan	3
Defined Benefit Plan, Measurement Date	31-Dec
Maximum annual benefits payable under the executive retirement plan	896,000
Incentive Plans [Abstract]
Discount on market price on the date of grant	85.00%
Discount on market price on the date of exercise	85.00%
Expiration date	27 months
General and Administrative Expense	22,808,000		23,704,000		20,881,000
Revenue Recognition [Abstract]
Deferred revenue	35,400,000		36,300,000
Deferred revenue, tenant reimbursements	22,400,000		21,900,000
Rental Income [Abstract]
Operating expense recoveries included in income from continuing operations	53,900,000		40,900,000		31,900,000
Additional rental income, net of reserves included in income from continuing operations	700,000		700,000		700,000
Mortgage Interest income [Abstract]
Number of Mortgage notes receivable outstanding with fixed interest rate	1
Other Operating Income [Abstract]
Number of owned real estate properties to which property operating agreements between company and sponsoring health system is applicable	5
Federal Income Taxes [Abstract]
Percentage of distribution of taxable income for qualify as REIT	90.00%
Mortgage Notes Receivable [Member]
Business Overview [Abstract]
Real estate properties and mortgages	1
Principles of Consolidation [Abstract]
Aggregate amount of construction mortgage loans	1,900,000
Mortgage Notes and Notes Receivable [Abstract]
Number of mortgage notes receivable outstanding	1		4
Mortgage notes receivable outstanding	1,900,000		125,500,000
Weighted average maturity period for Mortgage notes receivable	2 years 9 months 0 days		0 years 4 months 16 days
Mortgage Notes Receivable [Member] | Maximum [Member]
Mortgage Notes and Notes Receivable [Abstract]
Weighted average interest rate for Mortgage notes receivable			7.72%
Mortgage Notes Receivable [Member] | Minimum [Member]
Mortgage Notes and Notes Receivable [Abstract]
Weighted average interest rate for Mortgage notes receivable	6.50%		5.00%
At Market Lease Intangibles [Member]
Real Estate Properties [Abstract]
Elimination of real estate lease intangibles against accumulated depreciation	9,500,000		4,300,000
Variable Interest Entity, Not Primary Beneficiary [Member]
Principles of Consolidation [Abstract]
Number of construction mortgages loans			1
Aggregate amount of construction mortgage loans			80,000,000
Texas [Member]
Principles of Consolidation [Abstract]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	40.00%
Mortgage Note Financing [Member] | Iowa [Member]
Mortgage Notes and Notes Receivable [Abstract]
Mortgage notes receivable							40,000,000
Texas [Member]
Principles of Consolidation [Abstract]
Capital Contribution Proceeds From Minority Shareholders	1,800,000
Real Estate [Member]
Principles of Consolidation [Abstract]
Assets of consolidated partnership	18,000,000
Partnership, Ownership Percentage	100.00%
Fair Value, Inputs, Level 3 [Member]
Fair Value Measurements [Abstract]
Number of real estate properties classified as held for sale	2
Employee Stock Purchase Plan [Member]
Incentive Plans [Abstract]
General and Administrative Expense	300,000		300,000		400,000
Tenant and Capital Improvements [Member]
Real Estate Properties [Abstract]
Fully depreciated tenant and capital improvements eliminated against accumulated depreciation	$400,000
[1]	Level 2 - Fair value based on quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-driven valuations in which significant inputs and significant value drivers are observable in active markets.

Property_Investments_Details

Property Investments (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	property
Summary of Company's investment
Number of real estate investments	199
Number of owned real estate properties	198
Land	$200,114
Buildings, Improvements, and Lease Intangibles	3,048,251	2,861,935
Personal Property	9,914	9,267
Total real estate properties	3,258,279	3,067,187
Mortgage notes receivable	1,900
Accumulated Depreciation	-700,671	-632,109
Total real estate investments	3,260,179
Mortgage Notes Receivable [Member]
Summary of Company's investment
Number of real estate investments	1
Land	0
Buildings, Improvements, and Lease Intangibles	0
Personal Property	0
Mortgage notes receivable	1,900
Accumulated Depreciation	0
Land Held for Development and Corporate Property [Member]
Summary of Company's investment
Number of owned real estate properties	0
Land	17,054
Buildings, Improvements, and Lease Intangibles	0
Personal Property	5,476
Total real estate properties	22,530
Accumulated Depreciation	-3,834
Land Held for Development [Member]
Summary of Company's investment
Number of owned real estate properties	0
Land	17,054
Buildings, Improvements, and Lease Intangibles	0
Personal Property	0
Total real estate properties	17,054
Accumulated Depreciation	-115
Corporate Property [Member]
Summary of Company's investment
Number of owned real estate properties	0
Land	0
Buildings, Improvements, and Lease Intangibles	0
Personal Property	5,476
Total real estate properties	5,476
Accumulated Depreciation	-3,719
Owned Property [Member]
Summary of Company's investment
Number of owned real estate properties	198
Land	200,114
Buildings, Improvements, and Lease Intangibles	3,048,251
Personal Property	9,914
Total real estate properties	3,258,279
Accumulated Depreciation	-700,671
Medical office/outpatient [Member]
Summary of Company's investment
Number of owned real estate properties	173
Land	157,773
Buildings, Improvements, and Lease Intangibles	2,544,160
Personal Property	3,494
Total real estate properties	2,705,427
Accumulated Depreciation	-585,222
Medical office/outpatient [Member] | California [Member]
Summary of Company's investment
Number of owned real estate properties	9
Land	17,430
Buildings, Improvements, and Lease Intangibles	104,983
Personal Property	195
Total real estate properties	122,608
Accumulated Depreciation	-53,254
Medical office/outpatient [Member] | Colorado [Member]
Summary of Company's investment
Number of owned real estate properties	9
Land	7,197
Buildings, Improvements, and Lease Intangibles	188,593
Personal Property	208
Total real estate properties	195,998
Accumulated Depreciation	-18,338
Medical office/outpatient [Member] | District of Columbia [Member]
Summary of Company's investment
Number of owned real estate properties	2
Land	0
Buildings, Improvements, and Lease Intangibles	30,729
Personal Property	0
Total real estate properties	30,729
Accumulated Depreciation	-8,992
Medical office/outpatient [Member] | Indiana [Member]
Summary of Company's investment
Number of owned real estate properties	5
Land	3,891
Buildings, Improvements, and Lease Intangibles	140,749
Personal Property	0
Total real estate properties	144,640
Accumulated Depreciation	-22,575
Medical office/outpatient [Member] | Missouri [Member]
Summary of Company's investment
Number of owned real estate properties	4
Land	4,668
Buildings, Improvements, and Lease Intangibles	32,574
Personal Property	7
Total real estate properties	37,249
Accumulated Depreciation	-16,998
Medical office/outpatient [Member] | Michigan [Member]
Summary of Company's investment
Number of owned real estate properties	3
Land	5
Buildings, Improvements, and Lease Intangibles	23,158
Personal Property	33
Total real estate properties	23,196
Accumulated Depreciation	-7,644
Medical office/outpatient [Member] | Iowa [Member]
Summary of Company's investment
Number of owned real estate properties	6
Land	12,665
Buildings, Improvements, and Lease Intangibles	81,424
Personal Property	94
Total real estate properties	94,183
Accumulated Depreciation	-13,346
Medical office/outpatient [Member] | Illinois [Member]
Summary of Company's investment
Number of owned real estate properties	3
Land	6,142
Buildings, Improvements, and Lease Intangibles	49,194
Personal Property	143
Total real estate properties	55,479
Accumulated Depreciation	-11,100
Medical office/outpatient [Member] | Florida [Member]
Summary of Company's investment
Number of owned real estate properties	8
Land	6,891
Buildings, Improvements, and Lease Intangibles	90,674
Personal Property	252
Total real estate properties	97,817
Accumulated Depreciation	-43,774
Medical office/outpatient [Member] | Hawaii [Member]
Summary of Company's investment
Number of owned real estate properties	3
Land	8,327
Buildings, Improvements, and Lease Intangibles	121,022
Personal Property	68
Total real estate properties	129,417
Accumulated Depreciation	-17,726
Medical office/outpatient [Member] | North Carolina [Member]
Summary of Company's investment
Number of owned real estate properties	16
Land	5,096
Buildings, Improvements, and Lease Intangibles	156,538
Personal Property	95
Total real estate properties	161,729
Accumulated Depreciation	-34,824
Medical office/outpatient [Member] | Oklahoma [Member]
Summary of Company's investment
Number of owned real estate properties	2
Land	7,673
Buildings, Improvements, and Lease Intangibles	100,543
Personal Property	0
Total real estate properties	108,216
Accumulated Depreciation	-1,486
Medical office/outpatient [Member] | Tennessee [Member]
Summary of Company's investment
Number of owned real estate properties	14
Land	10,353
Buildings, Improvements, and Lease Intangibles	183,414
Personal Property	255
Total real estate properties	194,022
Accumulated Depreciation	-58,932
Medical office/outpatient [Member] | Texas [Member]
Summary of Company's investment
Number of owned real estate properties	43
Land	45,036
Buildings, Improvements, and Lease Intangibles	621,608
Personal Property	1,290
Total real estate properties	667,934
Accumulated Depreciation	-145,509
Medical office/outpatient [Member] | Virginia [Member]
Summary of Company's investment
Number of owned real estate properties	13
Land	2,451
Buildings, Improvements, and Lease Intangibles	183,340
Personal Property	136
Total real estate properties	185,927
Accumulated Depreciation	-36,277
Medical office/outpatient [Member] | Washington [Member]
Summary of Company's investment
Number of owned real estate properties	8
Land	8,974
Buildings, Improvements, and Lease Intangibles	201,227
Personal Property	186
Total real estate properties	210,387
Accumulated Depreciation	-22,784
Medical office/outpatient [Member] | Arizona [Member]
Summary of Company's investment
Number of owned real estate properties	9
Land	3,726
Buildings, Improvements, and Lease Intangibles	78,398
Personal Property	441
Total real estate properties	82,565
Accumulated Depreciation	-22,521
Medical office/outpatient [Member] | Other (17 states) [Member]
Summary of Company's investment
Number of owned real estate properties	16
Land	7,248
Buildings, Improvements, and Lease Intangibles	155,992
Personal Property	91
Total real estate properties	163,331
Accumulated Depreciation	-49,142
Inpatient [Member]
Summary of Company's investment
Number of owned real estate properties	14
Land	23,386
Buildings, Improvements, and Lease Intangibles	420,269
Personal Property	265
Total real estate properties	443,920
Accumulated Depreciation	-84,285
Inpatient [Member] | California [Member]
Summary of Company's investment
Number of owned real estate properties	1
Land	0
Buildings, Improvements, and Lease Intangibles	12,688
Personal Property	0
Total real estate properties	12,688
Accumulated Depreciation	-6,630
Inpatient [Member] | Colorado [Member]
Summary of Company's investment
Number of owned real estate properties	1
Land	623
Buildings, Improvements, and Lease Intangibles	10,788
Personal Property	0
Total real estate properties	11,411
Accumulated Depreciation	-362
Inpatient [Member] | Indiana [Member]
Summary of Company's investment
Number of owned real estate properties	1
Land	1,071
Buildings, Improvements, and Lease Intangibles	42,335
Personal Property	0
Total real estate properties	43,406
Accumulated Depreciation	-9,227
Inpatient [Member] | Missouri [Member]
Summary of Company's investment
Number of owned real estate properties	1
Land	1,989
Buildings, Improvements, and Lease Intangibles	109,304
Personal Property	0
Total real estate properties	111,293
Accumulated Depreciation	-3,503
Inpatient [Member] | Texas [Member]
Summary of Company's investment
Number of owned real estate properties	5
Land	9,507
Buildings, Improvements, and Lease Intangibles	158,149
Personal Property	265
Total real estate properties	167,921
Accumulated Depreciation	-24,558
Inpatient [Member] | Pennsylvania [Member]
Summary of Company's investment
Number of owned real estate properties	4
Land	6,555
Buildings, Improvements, and Lease Intangibles	74,634
Personal Property	0
Total real estate properties	81,189
Accumulated Depreciation	-38,166
Inpatient [Member] | Arizona [Member]
Summary of Company's investment
Number of owned real estate properties	1
Land	3,641
Buildings, Improvements, and Lease Intangibles	12,371
Personal Property	0
Total real estate properties	16,012
Accumulated Depreciation	-1,839
Other [Member]
Summary of Company's investment
Number of owned real estate properties	11
Land	1,901
Buildings, Improvements, and Lease Intangibles	83,822
Personal Property	679
Total real estate properties	86,402
Accumulated Depreciation	-27,330
Other [Member] | Indiana [Member]
Summary of Company's investment
Number of owned real estate properties	1
Land	96
Buildings, Improvements, and Lease Intangibles	3,662
Personal Property	32
Total real estate properties	3,790
Accumulated Depreciation	-2,477
Other [Member] | Michigan [Member]
Summary of Company's investment
Number of owned real estate properties	5
Land	193
Buildings, Improvements, and Lease Intangibles	12,728
Personal Property	183
Total real estate properties	13,104
Accumulated Depreciation	-8,379
Other [Member] | Iowa [Member]
Summary of Company's investment
Number of owned real estate properties	1
Land	0
Buildings, Improvements, and Lease Intangibles	40,263
Personal Property	0
Total real estate properties	40,263
Accumulated Depreciation	-1,536
Other [Member] | Tennessee [Member]
Summary of Company's investment
Number of owned real estate properties	1
Land	253
Buildings, Improvements, and Lease Intangibles	7,213
Personal Property	408
Total real estate properties	7,874
Accumulated Depreciation	-2,279
Other [Member] | Virginia [Member]
Summary of Company's investment
Number of owned real estate properties	2
Land	1,178
Buildings, Improvements, and Lease Intangibles	10,031
Personal Property	48
Total real estate properties	11,257
Accumulated Depreciation	-6,054
Other [Member] | Alabama [Member]
Summary of Company's investment
Number of owned real estate properties	1
Land	181
Buildings, Improvements, and Lease Intangibles	9,925
Personal Property	8
Total real estate properties	10,114
Accumulated Depreciation	($6,605)

Property_Investments_Details_T

Property Investments (Details Textual) (USD $)	Dec. 31, 2014
In Billions, unless otherwise specified	property
Real Estate Investment Property, Net [Abstract]
Investment in real estate properties and mortgage notes	$3.30
Number of real estate investments	199

Real_Estate_Leases_Details

Real Estate Leases (Details) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Leases [Abstract]
2015	$290,283
2016	263,505
2017	235,690
2018	203,285
2019	166,003
2020 and thereafter	679,757
Total	$1,838,523

Real_Estate_Leases_Narrative_D

Real Estate Leases - Narrative (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Mar. 31, 2015
			Customers
Concentration Risk [Line Items]
Proceeds from sale of cost method investment in real estate	$37,200,000	$96,700,000
Approximate Investment in real estate properties subject to outstanding contractual option to purchase	162,200,000
Assets held for sale, net	2,557,608,000	2,435,078,000
Disposition Sales Price	34,900,000	101,900,000
Customer Concentration Risk [Member] | Sales Revenue, Net [Member]
Concentration Risk [Line Items]
Number of customer account for 10% or more of company's revenues including revenue from discontinued operations			0
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Baylor Health System [Member]
Concentration Risk [Line Items]
Number of customer account for 10% or more of company's revenues including revenue from discontinued operations	1	1
Concentration Risk, Percentage	10.00%	11.00%
Potential Disposition [Member] | PENNSYLVANIA
Concentration Risk [Line Items]
Assets held for sale, net	7,700,000
Scenario, Forecast [Member] | Potential Disposition [Member] | PENNSYLVANIA
Concentration Risk [Line Items]
Disposition Sales Price				$15,000,000

Acquisitions_Dispositions_and_2

Acquisitions, Dispositions and Mortgage Repayments - Acquisitions (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
					sqft
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Elimination of Construction Mortgage Note Receivable	$81.20		$97.20
Real estate acquisitions [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Purchase Price	168.5		315.2
Elimination of Construction Mortgage Note Receivable			97.2
Elimination of Mortgage Note Receivable	-121.2
Mortgage Notes Payable Assumed	-18.2	[1]	-39.6	[1]
Cash Consideration	69.1	[2]	178.4	[2]
Real Estate	206.5		314.1
Other	2.1	[3]	1.1	[3]
Square Footage	673,454		940,925
Business Combination Liabilities Assumed Fair Value Adjustment	1.4		1.4
Real estate acquisitions [Member] | Minnesota [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Date Acquired	28-Jul-14
Purchase Price	19.8	[4]
Mortgage Notes Payable Assumed	-11.4	[4]
Cash Consideration	8.4	[2],[4]
Real Estate	20.9	[4]
Other	-1	[3],[4]
Square Footage	60,476	[4]
Business Combination Liabilities Assumed Fair Value Adjustment	1
Real estate acquisitions [Member] | Florida [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Date Acquired	16-Sep-14
Purchase Price	7.9
Cash Consideration	7.9	[2]
Real Estate	7.9
Square Footage	47,962
Real estate acquisitions [Member] | North Carolina [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Date Acquired	6-Jun-14		30-Oct-13
Purchase Price	6.5		20.1
Mortgage Notes Payable Assumed			-11	[1]
Cash Consideration	6.5	[2]	9.1	[2]
Real Estate	6.5		20
Other			0.1	[3]
Square Footage	35,292		90,633
Business Combination Liabilities Assumed Fair Value Adjustment			0.2
Real estate acquisitions [Member] | Texas [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Date Acquired	4-Jun-14
Purchase Price	8.7
Cash Consideration	8.7	[2]
Real Estate	8.8
Other	-0.1	[3]
Square Footage	48,048
Real estate acquisitions [Member] | Tennessee [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Date Acquired			29-Jan-13
Purchase Price			16.2
Cash Consideration			16.2	[2]
Real Estate			15.7
Other			0.5	[3]
Square Footage			52,225		39,345
Real estate acquisitions [Member] | Washington [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Date Acquired	1-Dec-14		18-Oct-13
Purchase Price	22.7		34.9
Mortgage Notes Payable Assumed	-16.6		-16.6	[1]
Cash Consideration	22.7	[2]	18.3	[2]
Real Estate	18.9		35.4
Other	3.8	[3]	-0.5	[3]
Square Footage	60,161		81,956
Business Combination Liabilities Assumed Fair Value Adjustment			0.5
Real estate acquisitions [Member] | Iowa [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Date Acquired	28-Mar-14
Purchase Price	0
Elimination of Mortgage Note Receivable	-40
Real Estate	40.2
Other	-0.2	[3]
Square Footage	152,655
Real estate acquisitions [Member] | Indiana [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Date Acquired			8-Aug-13
Purchase Price			44.3
Cash Consideration			44.3	[2]
Real Estate			43.3
Other			1	[3]
Square Footage			205,573
Real estate acquisitions [Member] | Missouri [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Date Acquired			27-Sep-13
Purchase Price			102.6
Elimination of Construction Mortgage Note Receivable			97.2
Cash Consideration			5.4	[2]
Real Estate			102.6
Square Footage			186,000
Oklahoma One [Member] | Real estate acquisitions [Member] | Oklahoma [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Date Acquired	22-May-14
Purchase Price	85.4
Elimination of Mortgage Note Receivable	-81.2
Cash Consideration	4.2	[2]
Real Estate	85.4
Square Footage	200,000
Oklahoma Two [Member] | Real estate acquisitions [Member] | Oklahoma [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Date Acquired	29-Oct-14
Purchase Price	17.5	[4]
Mortgage Notes Payable Assumed	-6.8	[4]
Cash Consideration	10.7	[2],[4]
Real Estate	17.9	[4]
Other	-0.4	[3],[4]
Square Footage	68,860	[4]
Texas One [Member] | Real estate acquisitions [Member] | Texas [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Date Acquired			8-Apr-13
Purchase Price			16.3
Cash Consideration			16.3	[2]
Real Estate			16.3
Square Footage			42,627
Texas Two [Member] | Real estate acquisitions [Member] | Texas [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Date Acquired			16-Dec-13
Purchase Price			19
Cash Consideration			19	[2]
Real Estate			19.1
Other			-0.1	[3]
Square Footage			97,552
Colorado One [Member] | Real estate acquisitions [Member] | Colorado [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Date Acquired			27-Sep-13
Purchase Price			33.2
Mortgage Notes Payable Assumed			-12	[1]
Cash Consideration			21.2	[2]
Real Estate			32.9
Other			0.3	[3]
Square Footage			80,153
Business Combination Liabilities Assumed Fair Value Adjustment			0.7
Colorado Two [Member] | Real estate acquisitions [Member] | Colorado [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Date Acquired			24-Oct-13
Purchase Price			21.6
Cash Consideration			21.6	[2]
Real Estate			21.7
Other			-0.1	[3]
Square Footage			70,138
Colorado Three [Member] | Real estate acquisitions [Member] | Colorado [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Date Acquired			16-Dec-13
Purchase Price			7
Cash Consideration			7	[2]
Real Estate			7.1
Other			($0.10)	[3]
Square Footage			34,068
[1]	The mortgage notes payable assumed in the acquisitions do not reflect the fair value adjustments totaling $1.4 million recorded by the Company upon acquisition (included in Other).
[2]	Cash consideration excludes non-real estate assets acquired and liabilities assumed in the acquisitions.
[3]	Includes intangibles recognized at acquisition and fair value adjustments on debt assumed.
[4]	The mortgage notes payable assumed in the acquisitions do not reflect the fair value adjustment totaling $1.4 million recorded by the Company upon acquisition (included in Other).

Acquisitions_Dispositions_and_3

Acquisitions, Dispositions and Mortgage Repayments - Dispositions (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
	sqft		sqft
Real Estate Dispositions [Line Items]
Sales Price	$34.90		$101.90
Closing Adjustments	-0.7		-1.5
Mortgage Notes	3		-3.7
Net Proceeds	37.2		96.7
Net Real Estate Investment	28.2		76.7
Other (including receivables)	0.5		2.3
Gain/ (Impairment)	5.5		21.4
Square Footage	476,536		541,502
Real estate dispositions [Member]
Real Estate Dispositions [Line Items]
Sales Price	34.9		101.9
Closing Adjustments	-0.7		-1.5
Mortgage Notes	-1.9		-4.3
Net Proceeds	32.3		96.1
Net Real Estate Investment	28.2		76.7
Other (including receivables)	0.5		2.3
Gain/ (Impairment)	5.5		21.4
Square Footage	476,536		541,502
Mortgage note repayments [Member]
Real Estate Dispositions [Line Items]
Mortgage Notes	4.9		0.6
Net Proceeds	4.9		0.6
Pennsylvania [Member] | Pennsylvania One [Member] | Real estate dispositions [Member] | Inpatient Facility Disposed September 2013 [Member]
Real Estate Dispositions [Line Items]
Date Disposed			30-Sep-13
Sales Price			17.6
Closing Adjustments			-0.3
Net Proceeds			17.3
Net Real Estate Investment			12.2
Gain/ (Impairment)			5.1
Square Footage			76,324
Pennsylvania [Member] | Pennsylvania Two [Member] | Real estate dispositions [Member] | Inpatient Facility Disposed September 2013 [Member]
Real Estate Dispositions [Line Items]
Date Disposed			30-Sep-13
Sales Price			17.6
Closing Adjustments			-0.4
Net Proceeds			17.2
Net Real Estate Investment			12.6
Gain/ (Impairment)			4.6
Square Footage			79,560
North Carolina [Member] | Real estate dispositions [Member]
Real Estate Dispositions [Line Items]
Net Real Estate Investment			13.4
Square Footage			57,580
North Carolina [Member] | Real estate dispositions [Member] | Medical Building Disposed December 2013 [Member]
Real Estate Dispositions [Line Items]
Date Disposed			5-Dec-13
Sales Price			17.6
Net Proceeds			17.6
Net Real Estate Investment			13.4
Other (including receivables)			2.1
Gain/ (Impairment)			2.1
Square Footage			57,580
Alabama [Member] | Real estate dispositions [Member]
Real Estate Dispositions [Line Items]
Net Proceeds			1.9
Net Real Estate Investment			1.4
Gain/ (Impairment)			0.5
Square Footage			10,593
Alabama [Member] | Real estate dispositions [Member] | Inpatient Facility Disposed July 2013 [Member]
Real Estate Dispositions [Line Items]
Date Disposed			31-Jul-13
Sales Price			17.5	[1]
Closing Adjustments			-0.1	[1]
Net Proceeds			17.4	[1]
Net Real Estate Investment			11.2	[1]
Gain/ (Impairment)			6.2	[1]
Square Footage			82,000	[1]
Alabama [Member] | Real estate dispositions [Member] | Medical Building Disposed December 2013 [Member]
Real Estate Dispositions [Line Items]
Date Disposed			31-Dec-13
Sales Price			1.9	[1]
Net Proceeds			1.9	[1]
Net Real Estate Investment			1.4	[1]
Gain/ (Impairment)			0.5	[1]
Square Footage			10,593	[1]
Florida [Member] | Real estate dispositions [Member]
Real Estate Dispositions [Line Items]
Net Real Estate Investment			0.8
Square Footage			14,322
Florida [Member] | Real estate dispositions [Member] | Medical Building Disposed April 11 2014 [Member]
Real Estate Dispositions [Line Items]
Date Disposed	11-Apr-14
Sales Price	1.8	[1]
Closing Adjustments	-0.1	[1]
Net Proceeds	1.7	[1]
Net Real Estate Investment	1.7	[1]
Square Footage	52,608	[1]
Florida [Member] | Real estate dispositions [Member] | Inpatient Facility Disposed July 2013 [Member]
Real Estate Dispositions [Line Items]
Date Disposed			15-Jul-13
Sales Price			11.9	[1]
Closing Adjustments			-0.2	[1]
Net Proceeds			11.7	[1]
Net Real Estate Investment			7.4	[1]
Gain/ (Impairment)			4.3	[1]
Square Footage			62,782	[1]
Florida [Member] | Real estate dispositions [Member] | Inpatient Facility Disposed October 2013 [Member]
Real Estate Dispositions [Line Items]
Date Disposed			31-Oct-13
Sales Price			0.8	[1]
Net Proceeds			0.8	[1]
Net Real Estate Investment			0.8	[1]
Square Footage			14,322	[1]
Iowa [Member] | Medical Building Disposed June 2013 [Member]
Real Estate Dispositions [Line Items]
Real Estate Dispositions Mortgage Note Receivable			1.1
Payments of Debt Extinguishment Costs			0.3
Iowa [Member] | Real estate dispositions [Member] | Medical Building Disposed June 2013 [Member]
Real Estate Dispositions [Line Items]
Date Disposed			3-Jun-13
Sales Price			6.9	[2],[3]
Net Proceeds			6.9	[2],[3]
Net Real Estate Investment			5.3	[2],[3]
Other (including receivables)			0.2	[2],[3]
Gain/ (Impairment)			1.4	[2],[3]
Square Footage			31,725	[2],[3]
Number of properties sold			2
Real Estate Dispositions Mortgage Note Receivable			1.1
Payments of Debt Extinguishment Costs			0.3
Tennessee [Member] | Building Disposed April 2013 [Member]
Real Estate Dispositions [Line Items]
Sales Price			0.6
Net Real Estate Investment			0.4
Square Footage			17,696
Tennessee [Member] | Real estate dispositions [Member] | Medical Building Disposed November 2014 [Member]
Real Estate Dispositions [Line Items]
Date Disposed	14-Nov-14
Sales Price	3.1	[3]
Closing Adjustments	-0.2	[3]
Net Proceeds	2.9	[3]
Net Real Estate Investment	3.2	[3]
Other (including receivables)	0.1	[3]
Gain/ (Impairment)	-0.4	[3]
Square Footage	32,204	[3]
Tennessee [Member] | Real estate dispositions [Member] | Building Disposed April 2013 [Member]
Real Estate Dispositions [Line Items]
Date Disposed			30-Apr-13
Sales Price			0.6	[1],[4]
Mortgage Notes			-0.6	[1],[4]
Net Real Estate Investment			0.4	[1],[4]
Gain/ (Impairment)			0.2	[1],[4]
Square Footage			17,696	[1],[4]
Texas [Member] | Real estate dispositions [Member] | Medical Building Disposed April 23 2014 [Member]
Real Estate Dispositions [Line Items]
Date Disposed	23-Apr-14
Sales Price	4.4	[1]
Closing Adjustments	-0.2	[1]
Net Proceeds	4.2	[1]
Net Real Estate Investment	4.1	[1]
Other (including receivables)	0.1	[1]
Square Footage	58,365	[1]
Texas [Member] | Real estate dispositions [Member] | Medical Building Disposed November 2014 [Member]
Real Estate Dispositions [Line Items]
Date Disposed	25-Nov-14
Sales Price	21.5	[3]
Net Proceeds	21.5	[3]
Net Real Estate Investment	12.1	[3]
Other (including receivables)	0.2	[3]
Gain/ (Impairment)	9.2	[3]
Square Footage	166,167	[3]
Texas [Member] | Real estate dispositions [Member] | Land Disposed March 2013 [Member]
Real Estate Dispositions [Line Items]
Date Disposed			25-Mar-13
Sales Price			5
Closing Adjustments			-0.2
Mortgage Notes			-3.7
Net Proceeds			1.1
Net Real Estate Investment			8.1
Gain/ (Impairment)			-3.3
Square Footage			15.1
Texas [Member] | Real estate dispositions [Member] | Medical Building Disposed May 15 2013 [Member]
Real Estate Dispositions [Line Items]
Date Disposed			15-May-13
Sales Price			1.3
Closing Adjustments			-0.1
Net Proceeds			1.2
Net Real Estate Investment			0.9
Gain/ (Impairment)			0.3
Square Footage			8,000
Texas [Member] | Real estate dispositions [Member] | Medical Building Disposed May 24 2013 [Member]
Real Estate Dispositions [Line Items]
Date Disposed			24-May-13
Sales Price			3.2	[1]
Closing Adjustments			-0.2	[1]
Net Proceeds			3	[1]
Net Real Estate Investment			3	[1]
Square Footage			100,920	[1]
Nevada [Member] | Real estate dispositions [Member] | Medical Building Disposed September 2014 [Member]
Real Estate Dispositions [Line Items]
Date Disposed	12-Sep-14
Sales Price	2.3
Closing Adjustments	-0.2
Mortgage Notes	-1.9
Net Proceeds	0.2
Net Real Estate Investment	4.9
Gain/ (Impairment)	-2.8
Square Footage	31,026
Missouri [Member] | Real estate dispositions [Member] | Medical Building Disposed December 2014 [Member]
Real Estate Dispositions [Line Items]
Date Disposed	18-Dec-14
Sales Price	1.3	[1]
Net Proceeds	1.3	[1]
Net Real Estate Investment	1.4	[1]
Other (including receivables)	0.1	[1]
Gain/ (Impairment)	-0.2	[1]
Square Footage	26,166	[1]
Illinois [Member] | Real estate dispositions [Member] | Medical Building Disposed December 2014 [Member]
Real Estate Dispositions [Line Items]
Date Disposed	29-Dec-14
Sales Price	0.5	[1]
Net Proceeds	0.5	[1]
Net Real Estate Investment	0.8	[1]
Gain/ (Impairment)	($0.30)	[1]
Square Footage	110,000	[1]
[1]	Previously included in assets held for sale.
[2]	The Company repaid a mortgage note payable of $1.1 million upon sale and incurred debt extinguishment costs of $0.3 million.
[3]	Includes two properties.
[4]	The Company-financed mortgage note receivable was repaid in October 2013.

Acquisitions_Dispositions_and_4

Acquisitions, Dispositions and Mortgage Repayments - Additional information (Details) (USD $)	12 Months Ended				1 Months Ended	3 Months Ended			0 Months Ended	1 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Apr. 30, 2014	Jun. 30, 2014	Dec. 31, 2014		Jan. 10, 2014	Jan. 31, 2015	Dec. 31, 2012	Mar. 31, 2014
	sqft		sqft				sqft			building	sqft
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Seller Financed Mortgage Notes Receivable	($3,000,000)		$3,700,000				($3,000,000)
Area Covered Under Real Estate Investment Sold in Measurement Units	476,536		541,502				476,536
Elimination of Construction Mortgage Note Receivable	81,200,000		97,200,000
Total real estate properties	3,258,279,000		3,067,187,000				3,258,279,000
Noncontrolling interests	0		1,809,000				0
Real Estate Investment Net Disposed of During Period	28,200,000		76,700,000				28,200,000
Disposition Sales Price	34,900,000		101,900,000				34,900,000
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property	5,500,000		21,400,000
Proceeds from sale of cost method investment in real estate	37,200,000		96,700,000
Closing Adjustments Disposed Entity	700,000		1,500,000				700,000
Real estate dispositions [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Seller Financed Mortgage Notes Receivable	1,900,000		4,300,000				1,900,000
Area Covered Under Real Estate Investment Sold in Measurement Units	476,536		541,502				476,536
Real Estate Investment Net Disposed of During Period	28,200,000		76,700,000				28,200,000
Disposition Sales Price	34,900,000		101,900,000				34,900,000
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property	5,500,000		21,400,000
Proceeds from sale of cost method investment in real estate	32,300,000		96,100,000
Closing Adjustments Disposed Entity	700,000		1,500,000				700,000
Mortgage note repayments [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Seller Financed Mortgage Notes Receivable	-4,900,000		-600,000				-4,900,000
Proceeds from sale of cost method investment in real estate	4,900,000		600,000
Real estate acquisitions [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Business Acquisition Purchase Price Allocation Square Footage	673,454		940,925				673,454
Purchase Price	168,500,000		315,200,000
Payments to Acquire Businesses, Gross	69,100,000	[1]	178,400,000	[1]
Business Combination, Consideration Transferred, Liabilities Incurred	18,200,000	[2]	39,600,000	[2]
Elimination of Construction Mortgage Note Receivable			97,200,000
Notes Assumed, Unamortized Premium	1,400,000		1,400,000
Iowa [Member] | Real estate acquisitions [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Business Acquisition Purchase Price Allocation Square Footage	152,655						152,655
Purchase Price	0
Oklahoma One [Member] | Real estate acquisitions [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Business Acquisition Purchase Price Allocation Square Footage	200,000						200,000
Face Amount	81,200,000						81,200,000
Purchase Price	85,400,000
Percentage of Medical Office Building Leased	100.00%						100.00%
Payments to Acquire Businesses, Gross	4,200,000
Elimination of Construction Mortgage Note Receivable	5,000,000
Anticipated Amount of Investment	800,000						800,000
Total real estate properties	91,200,000						91,200,000
Tennessee [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Percentage of Medical Office Building Leased			100.00%
Tennessee [Member] | Real estate acquisitions [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Business Acquisition Purchase Price Allocation Square Footage			52,225								39,345
Purchase Price			16,200,000
Number of Tenants Occupying Building			4
Payments to Acquire Businesses, Gross			16,200,000	[1]
Florida [Member] | Real estate dispositions [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Area Covered Under Real Estate Investment Sold in Measurement Units			14,322
Real Estate Investment Net Disposed of During Period			800,000
Impairment of Real Estate			100,000
Florida [Member] | Real estate acquisitions [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Business Acquisition Purchase Price Allocation Square Footage	47,962						47,962
Purchase Price	7,900,000
Percentage of Medical Office Building Leased	89.00%						89.00%
Payments to Acquire Businesses, Gross	7,900,000	[1]
Texas [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Contractual interest rates	5.35%						5.35%
Capital Contribution Proceeds From Minority Shareholders	1,800,000
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	40.00%				40.00%		40.00%
Partnership, Ownership Percentage	60.00%						60.00%
Partnership, Permanent Mortgage Loan Upon Settlement of Equity Contributions	14,200,000						14,200,000
Partnership, Consolidated Mortgage Loan	13,700,000						13,700,000
Purchase of Noncontrolling Interests					8,200,000
Noncontrolling interests	1,600,000						1,600,000
Decrease to additional paid-in capital	-6,600,000
Texas [Member] | Real estate acquisitions [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Business Acquisition Purchase Price Allocation Square Footage	48,048						48,048
Purchase Price	8,700,000
Payments to Acquire Businesses, Gross	8,700,000	[1]
Oklahoma Two [Member] | Real estate acquisitions [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Business Acquisition Purchase Price Allocation Square Footage	68,860						68,860
Interest Rate	6.10%
Purchase Price	17,500,000
Percentage of Medical Office Building Leased	97.00%						97.00%
Significant Acquisitions and Disposals, Acquisition Related Costs	10,700,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt	6,800,000						6,800,000
Notes Assumed, Unamortized Premium	400,000
Washington [Member] | Real estate acquisitions [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Business Acquisition Purchase Price Allocation Square Footage	60,161		81,956				60,161
Contractual interest rates			6.01%
Percentage of Property Leased			100.00%
Purchase Price	22,700,000		34,900,000
Payments to Acquire Businesses, Gross	22,700,000	[1]	18,300,000	[1]
Business Combination, Consideration Transferred, Liabilities Incurred	16,600,000		16,600,000	[2]
Notes Assumed, Unamortized Premium			500,000
Percentage of Medical Office Building Occupied	98.00%						98.00%
North Carolina [Member] | Real estate dispositions [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Area Covered Under Real Estate Investment Sold in Measurement Units			57,580
Real Estate Investment Net Disposed of During Period			13,400,000
North Carolina [Member] | Real estate acquisitions [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Business Acquisition Purchase Price Allocation Square Footage	35,292		90,633				35,292
Contractual interest rates			5.86%
Percentage of Property Leased			100.00%
Purchase Price	6,500,000		20,100,000
Percentage of Medical Office Building Leased	100.00%						100.00%
Payments to Acquire Businesses, Gross	6,500,000	[1]	9,100,000	[1]
Business Combination, Consideration Transferred, Liabilities Incurred			11,000,000	[2]
Notes Assumed, Unamortized Premium			200,000
Minnesota [Member] | Real estate acquisitions [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Business Acquisition Purchase Price Allocation Square Footage	60,476	[3]					60,476	[3]
Purchase Price	19,800,000	[3]
Percentage of Medical Office Building Leased	100.00%						100.00%
Payments to Acquire Businesses, Gross	8,400,000	[1],[3]
Business Combination, Consideration Transferred, Liabilities Incurred	11,400,000	[3]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt	11,400,000						11,400,000
Notes Assumed, Unamortized Premium	1,000,000
Long-term Debt, Weighted Average Interest Rate	6.67%						6.67%
Indiana [Member] | Real estate acquisitions [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Business Acquisition Purchase Price Allocation Square Footage			205,573
Percentage of Property Leased			87.00%
Purchase Price			44,300,000
Payments to Acquire Businesses, Gross			44,300,000	[1]
Missouri [Member] | Real estate acquisitions [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Business Acquisition Purchase Price Allocation Square Footage			186,000
Purchase Price			102,600,000
Payments to Acquire Businesses, Gross			5,400,000	[1]
Elimination of Construction Mortgage Note Receivable			97,200,000
Missouri [Member] | Additional Funding [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Elimination of Construction Mortgage Note Receivable	2,300,000		6,500,000
Texas One [Member] | Texas [Member] | Real estate acquisitions [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Business Acquisition Purchase Price Allocation Square Footage			42,627
Percentage of Property Leased			100.00%
Purchase Price			16,300,000
Number of Tenants Occupying Building			1
Payments to Acquire Businesses, Gross			16,300,000	[1]
Texas Two [Member] | Texas [Member] | Real estate acquisitions [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Business Acquisition Purchase Price Allocation Square Footage			97,552
Percentage of Property Leased			88.00%
Purchase Price			19,000,000
Payments to Acquire Businesses, Gross			19,000,000	[1]
Colorado One [Member] | Colorado [Member] | Real estate acquisitions [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Business Acquisition Purchase Price Allocation Square Footage			80,153
Contractual interest rates			6.17%
Percentage of Property Leased			100.00%
Purchase Price			33,200,000
Payments to Acquire Businesses, Gross			21,200,000	[1]
Business Combination, Consideration Transferred, Liabilities Incurred			12,000,000	[2]
Notes Assumed, Unamortized Premium			700,000
Colorado Two [Member] | Colorado [Member] | Real estate acquisitions [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Business Acquisition Purchase Price Allocation Square Footage			70,138
Percentage of Property Leased			83.00%
Purchase Price			21,600,000
Payments to Acquire Businesses, Gross			21,600,000	[1]
Colorado Three [Member] | Colorado [Member] | Real estate acquisitions [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Business Acquisition Purchase Price Allocation Square Footage			34,068
Percentage of Property Leased			100.00%
Purchase Price			7,000,000
Payments to Acquire Businesses, Gross			7,000,000	[1]
Medical Building Disposed May 24 2013 [Member] | Texas [Member] | Real estate dispositions [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Area Covered Under Real Estate Investment Sold in Measurement Units			100,920	[4]
Real Estate Investment Net Disposed of During Period			3,000,000	[4]
Impairment of Real Estate			6,800,000
Disposition Sales Price			3,200,000	[4]
Proceeds from sale of cost method investment in real estate			3,000,000	[4]
Closing Adjustments Disposed Entity			200,000	[4]
Medical Building Disposed June 2013 [Member] | Iowa [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Real Estate Dispositions Mortgage Note Receivable			1,100,000
Medical Building Disposed June 2013 [Member] | Iowa [Member] | Real estate dispositions [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Area Covered Under Real Estate Investment Sold in Measurement Units			31,725	[5],[6]
Real Estate Investment Net Disposed of During Period			5,300,000	[5],[6]
Number of properties sold			2
Disposition Sales Price			6,900,000	[5],[6]
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property			1,400,000	[5],[6]
Proceeds from sale of cost method investment in real estate			6,900,000	[5],[6]
Real Estate Dispositions Mortgage Note Receivable			1,100,000
Medical Building Disposed June 2013 [Member] | Iowa Two [Member] | Iowa [Member] | Real estate dispositions [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Area Covered Under Real Estate Investment Sold in Measurement Units			22,572
Medical Building Disposed June 2013 [Member] | Iowa One [Member] | Iowa [Member] | Real estate dispositions [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Area Covered Under Real Estate Investment Sold in Measurement Units			9,153
Medical Building Disposed April 11 2014 [Member] | Florida [Member] | Real estate dispositions [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Area Covered Under Real Estate Investment Sold in Measurement Units	52,608	[4]					52,608	[4]
Real Estate Investment Net Disposed of During Period	1,700,000	[4]					1,700,000	[4]
Impairment of Long-Lived Assets to be Disposed of	3,300,000
Disposition Sales Price	1,800,000	[4]					1,800,000	[4]
Proceeds from sale of cost method investment in real estate	1,700,000	[4]
Closing Adjustments Disposed Entity	100,000	[4]					100,000	[4]
Medical Building Disposed April 23 2014 [Member] | Texas [Member] | Real estate dispositions [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Area Covered Under Real Estate Investment Sold in Measurement Units	58,365	[4]					58,365	[4]
Real Estate Investment Net Disposed of During Period	4,100,000	[4]					4,100,000	[4]
Impairment of Long-Lived Assets to be Disposed of	2,600,000
Disposition Sales Price	4,400,000	[4]					4,400,000	[4]
Proceeds from sale of cost method investment in real estate	4,200,000	[4]
Closing Adjustments Disposed Entity	200,000	[4]					200,000	[4]
Medical Building Disposed September 2014 [Member] | Nevada [Member] | Real estate dispositions [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Seller Financed Mortgage Notes Receivable	1,900,000						1,900,000
Area Covered Under Real Estate Investment Sold in Measurement Units	31,026						31,026
Real Estate Investment Net Disposed of During Period	4,900,000						4,900,000
Impairment of Long-Lived Assets to be Disposed of	2,800,000
Disposition Sales Price	2,300,000						2,300,000
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property	-2,800,000
Proceeds from sale of cost method investment in real estate	200,000
Closing Adjustments Disposed Entity	200,000						200,000
Medical Building Disposed November 2014 [Member] | Tennessee [Member] | Real estate dispositions [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Area Covered Under Real Estate Investment Sold in Measurement Units	32,204	[6]					32,204	[6]
Real Estate Investment Net Disposed of During Period	3,200,000	[6]					3,200,000	[6]
Impairment of Long-Lived Assets to be Disposed of	400,000
Number of Medical Office Disposed Off Campus	2						2
Disposition Sales Price	3,100,000	[6]					3,100,000	[6]
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property	-400,000	[6]
Proceeds from sale of cost method investment in real estate	2,900,000	[6]
Closing Adjustments Disposed Entity	200,000	[6]					200,000	[6]
Medical Building Disposed November 2014 [Member] | Texas [Member] | Real estate dispositions [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Area Covered Under Real Estate Investment Sold in Measurement Units	166,167	[6]					166,167	[6]
Real Estate Investment Net Disposed of During Period	12,100,000	[6]					12,100,000	[6]
Number of Medical Office Disposed Off Campus	2						2
Disposition Sales Price	21,500,000	[6]					21,500,000	[6]
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property	9,200,000	[6]
Proceeds from sale of cost method investment in real estate	21,500,000	[6]
Medical Building Disposed December 2014 [Member] | Missouri [Member] | Real estate dispositions [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Area Covered Under Real Estate Investment Sold in Measurement Units	26,166	[4]					26,166	[4]
Real Estate Investment Net Disposed of During Period	1,400,000	[4]					1,400,000	[4]
Impairment of Long-Lived Assets to be Disposed of	200,000					3,100,000
Disposition Sales Price	1,300,000	[4]					1,300,000	[4]
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property	-200,000	[4]
Proceeds from sale of cost method investment in real estate	1,300,000	[4]
Medical Building Disposed December 2014 [Member] | Illinois [Member] | Real estate dispositions [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Area Covered Under Real Estate Investment Sold in Measurement Units	110,000	[4]					110,000	[4]
Real Estate Investment Net Disposed of During Period	800,000	[4]					800,000	[4]
Impairment of Long-Lived Assets to be Disposed of	300,000						5,600,000
Disposition Sales Price	500,000	[4]					500,000	[4]
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property	-300,000	[4]
Proceeds from sale of cost method investment in real estate	500,000	[4]
Land Disposed March 2013 [Member] | Texas [Member] | Real estate dispositions [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Seller Financed Mortgage Notes Receivable			3,700,000
Area Covered Under Real Estate Investment Sold in Measurement Units			15.1
Real Estate Investment Net Disposed of During Period			8,100,000
Disposition Sales Price			5,000,000
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property			-3,300,000
Proceeds from sale of cost method investment in real estate			1,100,000
Closing Adjustments Disposed Entity			200,000
Land Disposed March 2013 [Member] | Texas [Member] | Real estate dispositions [Member] | Minimum [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Contractual interest rates			5.00%
Land Disposed March 2013 [Member] | Texas [Member] | Real estate dispositions [Member] | Maximum [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Contractual interest rates			6.00%
Building Disposed April 2013 [Member] | Tennessee [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Area Covered Under Real Estate Investment Sold in Measurement Units			17,696
Real Estate Investment Net Disposed of During Period			400,000
Impairment of Real Estate			1,300,000
Disposition Sales Price			600,000
Deferred Gain on Disposition of Assets			200,000
Building Disposed April 2013 [Member] | Tennessee [Member] | Real estate dispositions [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Seller Financed Mortgage Notes Receivable			600,000	[4],[7]
Area Covered Under Real Estate Investment Sold in Measurement Units			17,696	[4],[7]
Contractual interest rates			7.50%
Real Estate Investment Net Disposed of During Period			400,000	[4],[7]
Disposition Sales Price			600,000	[4],[7]
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property			200,000	[4],[7]
Other Mortgage Loans [Member] | Other Property [Member] | Iowa [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Business Acquisition Purchase Price Allocation Square Footage	152,655						152,655
Face Amount	40,000,000						40,000,000					40,000,000
Interest Rate	7.70%								7.70%
Incremental Interest Rate for Default	3.00%
Percentage of Property Leased	93.00%
Medical Office Building [Member] | Texas [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Purchase Price	8,700,000
Limited Liability Company, Ownership Percentage	56.90%						56.90%
Real Estate [Member] | Medical Office Building [Member] | Texas [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Percentage of Medical Office Building Leased	95.00%						95.00%
St Josephs Medical Center [Member] | Indiana [Member] | Real estate acquisitions [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Percentage of Property Leased			48.00%
Poudre Valley Health System [Member] | Colorado One [Member] | Colorado [Member] | Real estate acquisitions [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Percentage of Property Leased			71.00%
Mercy Health [Member] | Missouri [Member] | Real estate acquisitions [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Percentage of Property Leased			100.00%
Seton Healthcare [Member] | Texas Two [Member] | Texas [Member] | Real estate acquisitions [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Percentage of Property Leased			24.00%
Subsequent Event [Member] | California [Member] | Real estate acquisitions [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Percentage of Property Leased										97.00%
Purchase Price										$39,300,000
Number of Medical Office Buildings in Health System										2
Subsequent Event [Member] | Kaiser Permanente and Washington Hospital Healthcare System [Member] | California [Member] | Real estate acquisitions [Member]
Real Estate Acquisitions and Mortgage Note Financing [Line Items]
Business Acquisition Purchase Price Allocation Square Footage										110,679
Percentage of Property Leased										59.00%
[1]	Cash consideration excludes non-real estate assets acquired and liabilities assumed in the acquisitions.
[2]	The mortgage notes payable assumed in the acquisitions do not reflect the fair value adjustments totaling $1.4 million recorded by the Company upon acquisition (included in Other).
[3]	The mortgage notes payable assumed in the acquisitions do not reflect the fair value adjustment totaling $1.4 million recorded by the Company upon acquisition (included in Other).
[4]	Previously included in assets held for sale.
[5]	The Company repaid a mortgage note payable of $1.1 million upon sale and incurred debt extinguishment costs of $0.3 million.
[6]	Includes two properties.
[7]	The Company-financed mortgage note receivable was repaid in October 2013.

Acquisitions_Dispositions_and_5

Acquisitions, Dispositions and Mortgage Repayments - Assets Acquired and Liabilities Assumed (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Business Acquisition [Line Items]
Building	$181.70		$280.20
Land	12.7		21.6
Personal property			0.3
Intangibles	15.4		14.5
Mortgage notes payable assumed, including fair value adjustments	-19.6		-41
Foreclosed mortgage note receivable	-40
Elimination of mortgage note receivable upon acquisition	-81.2		-97.2
Other assets acquired	3		1.2
Accounts payable, accrued liabilities and other liabilities assumed	-2.3		-1.9
Cash acquired	0.2
Total cash paid	69.9	[1]	177.7	[2]
Acquisition related costs	0.8		0.7
At Market Lease Intangibles [Member]
Business Acquisition [Line Items]
Intangibles	12.1		12
Above-market lease intangibles [Member]
Business Acquisition [Line Items]
Intangibles			2.9
Below-market ground lease intangibles [Member]
Business Acquisition [Line Items]
Intangibles	3.8
Intangible asset useful life	63 years 8 months 12 days
Above-market ground lease intangibles [Member]
Business Acquisition [Line Items]
Intangibles	-0.1
Intangible asset useful life	91 years 3 months 18 days
Below-market lease intangibles [Member]
Business Acquisition [Line Items]
Intangibles	($0.40)		($0.40)
Personal Property [Member]
Business Acquisition [Line Items]
Asset estimated useful life			1 year 10 months 24 days
Minimum [Member] | At Market Lease Intangibles [Member]
Business Acquisition [Line Items]
Intangible asset useful life	4 years 9 months 18 days		3 years 8 months 12 days
Minimum [Member] | Above-market lease intangibles [Member]
Business Acquisition [Line Items]
Intangible asset useful life			2 years 3 months 18 days
Minimum [Member] | Below-market lease intangibles [Member]
Business Acquisition [Line Items]
Intangible asset useful life	3 years 9 months 18 days		6 months
Minimum [Member] | Building [Member]
Business Acquisition [Line Items]
Asset estimated useful life	11 years 6 months		7 years
Minimum [Member] | Personal Property [Member]
Business Acquisition [Line Items]
Asset estimated useful life	1 year 10 months 24 days
Maximum [Member] | At Market Lease Intangibles [Member]
Business Acquisition [Line Items]
Intangible asset useful life	13 years 10 months 24 days		20 years
Maximum [Member] | Above-market lease intangibles [Member]
Business Acquisition [Line Items]
Intangible asset useful life			16 years 3 months 18 days
Maximum [Member] | Below-market lease intangibles [Member]
Business Acquisition [Line Items]
Intangible asset useful life	6 years 6 months		7 years 4 months 24 days
Maximum [Member] | Building [Member]
Business Acquisition [Line Items]
Asset estimated useful life	39 years		39 years
Maximum [Member] | Personal Property [Member]
Business Acquisition [Line Items]
Asset estimated useful life	15 years 9 months 18 days
[1]	Total cash paid includes receivables acquired net of liabilities assumed in the acquisitions of approximately $0.8 million
[2]	Total cash paid includes liabilities assumed net of receivables acquired in the acquisitions of $0.7 million.

Mortgage_Notes_Receivable_Deta

Mortgage Notes Receivable (Details) (USD $)	12 Months Ended		0 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Jan. 10, 2014	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011	Mar. 31, 2014
Mortgage Loans on Real Estate [Line Items]
Mortgage notes receivable	$1,900	[1]		$125,547	[1]	$162,191	$97,381
Construction Loans [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage notes receivable	0			79,969
Construction Loans [Member] | Oklahoma [Member] | Medical Office Building [Member]
Mortgage Loans on Real Estate [Line Items]
Face Amount	94,889
Interest Rate	7.72%
Mortgage notes receivable	0			79,969
Other Mortgage Loans [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage notes receivable	1,900			45,578
Other Mortgage Loans [Member] | Iowa [Member] | Other Property [Member]
Mortgage Loans on Real Estate [Line Items]
Face Amount	40,000							40,000
Interest Rate	7.70%		7.70%
Mortgage notes receivable	0			39,973
Other Mortgage Loans [Member] | Florida [Member] | Medical Office Building [Member]
Mortgage Loans on Real Estate [Line Items]
Face Amount	3,750
Interest Rate	7.50%
Mortgage notes receivable	0			3,750
Other Mortgage Loans [Member] | Texas [Member] | Land [Member]
Mortgage Loans on Real Estate [Line Items]
Face Amount	3,666
Mortgage notes receivable	0			1,855
Other Mortgage Loans [Member] | Texas [Member] | Land [Member] | Minimum [Member]
Mortgage Loans on Real Estate [Line Items]
Interest Rate	5.00%
Other Mortgage Loans [Member] | Texas [Member] | Land [Member] | Maximum [Member]
Mortgage Loans on Real Estate [Line Items]
Interest Rate	6.00%
Other Mortgage Loans [Member] | Nevada [Member] | Medical Office Building [Member]
Mortgage Loans on Real Estate [Line Items]
Face Amount	1,900
Interest Rate	6.50%
Mortgage notes receivable	$1,900			$0
[1]	Level 2 - Fair value based on quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-driven valuations in which significant inputs and significant value drivers are observable in active markets.

Mortgage_Notes_Receivable_Narr

Mortgage Notes Receivable - Narrative (Details) (USD $)	12 Months Ended				0 Months Ended	1 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Jan. 10, 2014	31-May-14	Mar. 31, 2014
Mortgage Loans on Real Estate [Line Items]
Existing Construction Mortgage Loans Funded	$1,200,000		$58,700,000
Construction mortgage note receivable prepayment	81,200,000		97,200,000
Other Mortgage Loans [Member] | Other Property [Member] | Iowa [Member]
Mortgage Loans on Real Estate [Line Items]
Interest Rate	7.70%				7.70%
Percentage of Property Leased	93.00%
Face Amount	40,000,000						40,000,000
Real Estate Acquisitions [Member]
Mortgage Loans on Real Estate [Line Items]
Purchase Price	168,500,000		315,200,000
Cash Consideration	69,100,000	[1]	178,400,000	[1]
Construction mortgage note receivable prepayment			97,200,000
Real Estate Acquisitions [Member] | Iowa [Member]
Mortgage Loans on Real Estate [Line Items]
Purchase Price	0
Real Estate Acquisitions [Member] | Construction Loans [Member] | Oklahoma [Member]
Mortgage Loans on Real Estate [Line Items]
Purchase Price						85,400,000
Cash Consideration						4,200,000
Percentage of Medical Office Building Leased						100.00%
Construction mortgage note receivable prepayment	1,200,000
Face Amount						$81,200,000
[1]	Cash consideration excludes non-real estate assets acquired and liabilities assumed in the acquisitions.

Discontinued_Operations_Detail

Discontinued Operations (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Balance Sheet data (as of the period ended):
Land	$183,060	$178,931
Buildings, improvements and lease intangibles	3,048,251	2,861,935
Personal property	9,914	9,267
Total real estate properties	3,258,279	3,067,187
Less accumulated depreciation	-700,671	-632,109
Assets held for sale, net	2,557,608	2,435,078
Other assets, net (including receivables)	185,337	153,514
Assets held for sale and discontinued operations, net	9,146	6,852
Accounts payable and accrued liabilities	70,240	73,741
Other liabilities	62,152	61,064
Liabilities of discontinued operations	372	1,112
Discontinued Operations [Member]
Balance Sheet data (as of the period ended):
Land	422	1,578
Buildings, improvements and lease intangibles	12,822	15,400
Personal property	13	0
Total real estate properties	13,257	16,978
Less accumulated depreciation	-4,464	-10,211
Assets held for sale, net	8,793	6,767
Other assets, net (including receivables)	353	85
Assets of discontinued operations, net	353	85
Assets held for sale and discontinued operations, net	9,146	6,852
Accounts payable and accrued liabilities	86	1,091
Other liabilities	286	21
Liabilities of discontinued operations	$372	$1,112

Discontinued_Operations_Detail1

Discontinued Operations (Details 1) (USD $)	3 Months Ended																12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Revenues
Rental income																	$361,525		$312,322		$282,444
Other operating																	5,665		5,926		6,052
Total Revenue	95,001	[1]	93,612	[2]	91,671	[3]	90,571	[4]	88,622	[5]	82,805	[6]	80,552	[7]	78,970	[8]	370,855		330,949		297,682
Expenses
Property operating																	134,057		122,571		113,287
General and administrative																	22,808		23,704		20,881
Depreciation																	99,384		86,239		79,776
Amortization																	10,820		10,645		10,418
Bad debt, net of recoveries																	31		172		230
Total Expenses																	267,100		243,331		224,592
Other Income (Expense)
Loss on extinguishment of debt													29,900						-29,638
Interest expense																	-72,413		-73,511		-74,955
Interest and other income, net																	2,637		947		973
Total other income (expense)																	-69,776		-100,710		-73,982
Income from discontinued operations																	967		5,246		10,461
Impairments																	-12,029		-9,889		-14,908
Gain on sales of real estate properties	9,300								2,700		20,200		1,800				9,283		24,718		10,874
Discontinued operations	9,013	[1]	-4,284	[2]	-2,994	[3]	-3,514	[4]	2,800	[5]	15,272	[6]	3,623	[7]	-1,620	[8]	-1,779		20,075		6,427
Income (Loss) from Discontinued Operations per Common Share - Basic (in dollars per share)																	($0.02)		$0.22		$0.08
Income (Loss) from Discontinued Operations per Common Share - Diluted (in dollars per share)																	($0.02)		$0.22		$0.08
Discontinued Operations [Member]
Revenues
Rental income																	5,660	[9]	14,202	[9]	24,290	[9]
Other operating																	4	[9]	9	[9]	69	[9]
Total Revenue																	5,664	[9]	14,211	[9]	24,359	[9]
Expenses
Property operating																	3,126	[10]	4,830	[10]	6,894	[10]
General and administrative																	19	[10]	26	[10]	33	[10]
Depreciation																	1,551	[10]	3,794	[10]	6,888	[10]
Amortization																	0	[10]	63	[10]	147	[10]
Bad debt, net of recoveries																	3	[10]	13	[10]	10	[10]
Total Expenses																	4,699	[10]	8,726	[10]	13,972	[10]
Other Income (Expense)
Loss on extinguishment of debt																	0	[11]	-270	[11]	0	[11]
Interest expense																	0	[11]	-40	[11]	-97	[11]
Interest and other income, net																	2	[11]	71	[11]	171	[11]
Total other income (expense)																	2	[11]	-239	[11]	74	[11]
Income from discontinued operations																	967		5,246		10,461
Impairments																	-12,029	[12]	-9,889	[12]	-14,908	[12]
Gain on sales of real estate properties																	9,283	[13]	24,718	[13]	10,874	[13]
Discontinued operations																	($1,779)		$20,075		$6,427
Income (Loss) from Discontinued Operations per Common Share - Basic (in dollars per share)																	($0.02)		$0.22		$0.08
Income (Loss) from Discontinued Operations per Common Share - Diluted (in dollars per share)																	($0.02)		$0.22		$0.08
[1]	The increases in net income and amounts per share for the fourth quarter of 2014 are primarily attributable to gains on sales of real estate totaling $9.3 million, partially offset by impairment charges of $1.0 million.
[2]	The decreases in net income and amounts per share for the third quarter of 2014 are primarily attributable to impairment charges of
[3]	The increases in net income and amounts per share for the second quarter of 2014 are primarily attributable to a $1.9 million cash reimbursement received by the Company for certain operating expenses paid by the Company for years 2006 through 2013
[4]	The decreases in net income and amounts per share for the first quarter of 2014 are primarily attributable to impairment charges of $3.4 million.
[5]	The increases in net income and amounts per share for the fourth quarter of 2013 are primarily attributable to gains on sales of real estate totaling $2.7 million.
[6]	The increases in net income and amounts per share for the third quarter of 2013 are primarily attributable to gains on sales of real estate totaling $20.2 million, partially offset by impairment charges of $6.3 million.
[7]	The decreases in net income and amounts per share for the second quarter of 2013 are primarily attributable to losses of extinguishment of debt of $29.9 million, of which $0.3 million is included in discontinued operations. This amount is partially offset by gains on sales of real estate totaling $1.8 million.
[8]	The decreases in net income and amounts per share for the first quarter of 2013 are primarily attributable to impairment charges of $3.6 million.
[9]	Total revenues for the years ended December 31, 2014, 2013 and 2012 included $4.3 million, $12.6 million and $22.2 million, respectively, related to properties sold; and $1.4 million, $1.6 million and $2.2 million, respectively, related to two properties held for sale as of December 31, 2014.
[10]	Total expenses for the years ended December 31, 2014, 2013 and 2012 included $4.7 million, $8.7 million and $13.5 million, respectively, related to properties sold; and for the year ended December 31, 2012 included $0.5 million related to two properties held for sale as of December 31, 2014.
[11]	Other income (expense) for the years ended December 31, 2014, 2013, and 2012 included income (expense) related to properties sold.
[12]	Impairments for the year ended December 31, 2014 included $3.7 million in connection with the sale of three properties and $8.3 million on two properties in held for sale and two properties there were reclassified to held for sale during 2014. All four properties of these were subsequently sold; December 31, 2013 included the following: $3.3 million related to the sale of a land parcel; $0.4 million related to two properties classified as held for sale and subsequently sold for a gain; and $6.2 million related to three properties held for sale; and December 31, 2012 included $11.1 million related to 12 properties sold and $3.8 million related to one properties held for sale.
[13]	Gain on sales of real estate properties for the years ended December 31, 2014, 2013 and 2012 included gains on the sale of three, 12 and seven properties, respectively.

Discontinued_Operations_Detail2

Discontinued Operations (Details Textual) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
	property	property	property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of impaired properties sold	6
Number of Properties Reclassified to Held For Sale	2
Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue related to properties sold	$4.30	$12.60	$22.20
Revenue related to properties held for sale	1.4	1.6	2.2
Number of properties held for sale	2	3
Expenses related to sale of real estate	4.7	8.7	13.5
Expense related to properties held for sale			0.5
Impairments related to sold property	3.7	0.4	11.1
Impairments related to property held for sale	8.3	6.2	3.8
Number of impaired properties sold	3	2	12
Number of impaired properties held for sale	2	3	1
Number of Properties Reclassified to Held For Sale	2
Number of properties related to gain on sales	3	12	7
Land Parcel [Member] | Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairments related to sold property		$3.30

Impairment_Charges_Details_Tex

Impairment Charges (Details Textual) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Abstract]
Impairments	$12,029	$9,889	$14,908

Other_Assets_Details

Other Assets (Details) (USD $)	Dec. 31, 2014	31-May-14	Dec. 31, 2013
		sqft
		building
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Prepaid assets	$61,405,000		$55,317,000
Straight-line rent receivables	52,628,000		42,215,000
Additional long-lived assets, net	17,258,000		14,380,000
Additional long-lived assets, net	14,371,000		15,871,000
Ground lease modification, net	11,697,000
Ground lease modification, net	9,856,000		11,730,000
Deferred financing costs, net	8,746,000		7,046,000
Accounts receivable	-465,000		-541,000
Allowance for uncollectible accounts	3,487,000		3,487,000
Goodwill	1,934,000		2,001,000
Other	4,420,000		2,008,000
Other Assets	185,337,000		153,514,000
Other Assets (Textual) [Abstract]
Number of properties subject to ground lease modification		5
Ground lease modifications, square footage		424,000
Ground lease modification payments		$12,000,000

Intangible_Assets_and_Liabilit2

Intangible Assets and Liabilities - Components of intangible assets and liabilities (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Schedule of finite lived intangible assets and liabilities
Intangible assets and liabilities, gross	$166.30	$149.50
Intangible assets and liabilities, accumulated amortization	94.3	80.3
Assets and liabilities, weighted avg. life (years)	17 years
Below-market lease intangibles [Member] | Other liabilities [Member]
Schedule of finite lived intangible assets and liabilities
Liabilities gross balance	-9.2	-8.9
Liabilities accumulated amortization	-4.8	-4.1
Liabilities, weighted avg. life (years)	14 years 3 months 18 days
Goodwill [Member] | Other assets [Member]
Schedule of finite lived intangible assets and liabilities
Assets gross balance	3.5	3.5
Assets accumulated amortization	0	0
Deferred financing costs [Member] | Other assets [Member]
Schedule of finite lived intangible assets and liabilities
Assets gross balance	17.6	16.4
Assets accumulated amortization	7.7	4.7
Assets, weighted avg. life (years)	4 years 3 months 18 days
Above-market lease intangibles [Member] | Other assets [Member]
Schedule of finite lived intangible assets and liabilities
Assets gross balance	21.1	17.3
Assets accumulated amortization	3.8	2.9
Assets, weighted avg. life (years)	52 years 8 months 12 days
Customer relationship intangibles [Member] | Other assets [Member]
Schedule of finite lived intangible assets and liabilities
Assets gross balance	2.6	2.6
Assets accumulated amortization	0.7	0.6
Assets, weighted avg. life (years)	28 years 7 months 6 days
At Market Lease Intangibles [Member] | Real estate properties [Member]
Schedule of finite lived intangible assets and liabilities
Assets gross balance	130.7	118.6
Assets accumulated amortization	$86.90	$76.20
Assets, weighted avg. life (years)	7 years 2 months 12 days

Intangible_Assets_and_Liabilit3

Intangible Assets and Liabilities - Expected future amortization expense (Details) (USD $)	Dec. 31, 2014
In Millions, unless otherwise specified
Future Amortization of Intangibles, Net [Abstract]
2015	$12.40
2016	11.4
2017	8.3
2018	6.5
2019	$4.90

Notes_and_Bonds_Payable_Detail

Notes and Bonds Payable (Details) (USD $)	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2014		Dec. 31, 2013
Debt Instrument [Line Items]
Notes and bonds payable		1,403,692,000	[1]	$1,348,459,000	[1]
Line of Credit [Member] | Unsecured Credit Facility due 2017 [Member]
Debt Instrument [Line Items]
Notes and bonds payable		85,000,000		238,000,000
Medium-term Notes [Member] | Unsecured Term Loan Due 2019 [Member]
Debt Instrument [Line Items]
Notes and bonds payable		200,000,000		0
Contractual interest rates, basis spread on variable rate	1.45%
Mortgage notes payable [Member]
Debt Instrument [Line Items]
Contractual interest rates, minimum		5.00%
Contractual interest rates, maximum		7.60%
Mortgage notes payable [Member] | 5.000%-7.63% Mortgage Notes Payable [Member]
Debt Instrument [Line Items]
Notes and bonds payable		173,267,000		$165,796,000
Contractual interest rates, minimum		5.00%
Contractual interest rates, maximum		7.63%
LIBOR [Member] | Line of Credit [Member] | Unsecured Credit Facility due 2017 [Member]
Debt Instrument [Line Items]
Contractual interest rates, basis spread on variable rate		1.40%
LIBOR [Member] | Medium-term Notes [Member] | Unsecured Term Loan Due 2019 [Member]
Debt Instrument [Line Items]
Contractual interest rates, basis spread on variable rate		1.45%
[1]	Level 3 - Fair value derived from valuation techniques in which one of more significant inputs or significant value drivers are unobservable.

Notes_and_Bonds_Payable_Senior

Notes and Bonds Payable - Senior Notes (Details) (USD $)	Dec. 31, 2014		Dec. 31, 2013		Dec. 04, 2009	Dec. 13, 2010	Mar. 26, 2013
Debt Instrument [Line Items]
Notes and bonds payable	$1,403,692,000	[1]	$1,348,459,000	[1]
Senior Notes [Member] | 6.500% Senior Notes Due 2017 [Member]
Debt Instrument [Line Items]
Senior notes face value	300,000,000		300,000,000		300,000,000
Unaccreted discount	-692,000		-992,000
Notes and bonds payable	299,308,000		299,008,000
Senior Notes [Member] | 5.750% Senior Notes Due 2021 [Member]
Debt Instrument [Line Items]
Senior notes face value	400,000,000		400,000,000			400,000,000
Unaccreted discount	-2,136,000		-2,422,000
Notes and bonds payable	397,864,000		397,578,000
Senior Notes [Member] | 3.75% Senior Notes Due 2023 [Member]
Debt Instrument [Line Items]
Senior notes face value	250,000,000		250,000,000				250,000,000
Unaccreted discount	-1,747,000		-1,923,000				-2,100,000
Notes and bonds payable	$248,253,000		$248,077,000
[1]	Level 3 - Fair value derived from valuation techniques in which one of more significant inputs or significant value drivers are unobservable.

Notes_and_Bonds_Payable_Mortga

Notes and Bonds Payable - Mortgage Notes (Details) (USD $)	Dec. 31, 2014		Dec. 31, 2013
Debt Instrument [Line Items]
Notes and bonds payable	$1,403,692,000	[1]	$1,348,459,000	[1]
Mortgage notes payable [Member] | 5.000%-7.63% Mortgage Notes Payable [Member]
Debt Instrument [Line Items]
Mortgage notes	172,530,000		166,684,000
Unamortized premium	3,205,000		2,708,000
Unaccreted discount	-2,468,000		-3,596,000
Notes and bonds payable	$173,267,000		$165,796,000
[1]	Level 3 - Fair value derived from valuation techniques in which one of more significant inputs or significant value drivers are unobservable.

Notes_and_Bonds_Payable_Detail1

Notes and Bonds Payable - Details of Mortgage Notes (Details) (USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013
	mortgage_note_payable
Debt Instrument [Line Items]
Number of outstanding mortgage notes	17
Mortgage notes payable [Member]
Debt Instrument [Line Items]
Investment in Collateral	$402,100,000	[1]
Mortgage notes payable carrying amount	173,300,000		165,800,000
Number of outstanding mortgage notes	22
Contractual interest rates, minimum	5.00%
Contractual interest rates, maximum	7.60%
Mortgage notes payable [Member] | Mortgage Notes 7.765% [Member] | Life Insurance Co. [Member]
Debt Instrument [Line Items]
Mortgage notes	4,700,000
Effective Interest rate	7.77%	[2]
Maturity Date	2017-01
Collateral	MOB	[3]
Principal and interest payments	Monthly/20-yr amort.	[4]
Principal and interest amortization period	20 years
Investment in Collateral	12,100,000
Mortgage notes payable carrying amount	900,000		1,200,000
Mortgage notes payable [Member] | Mortgage Notes 5.550% [Member] | Commercial Bank [Member]
Debt Instrument [Line Items]
Mortgage notes	1,800,000
Effective Interest rate	5.55%	[2]
Maturity Date	2030-10
Collateral	OTH	[3]
Principal and interest payments	Monthly/27-yr amort.	[4]
Principal and interest amortization period	27 years
Investment in Collateral	7,900,000
Mortgage notes payable carrying amount	1,500,000		1,500,000
Mortgage notes payable [Member] | Mortgage Notes 5.490% [Member] | Life Insurance Co. [Member]
Debt Instrument [Line Items]
Mortgage notes	15,100,000
Effective Interest rate	5.49%	[2]
Maturity Date	2016-01
Collateral	MOB	[3]
Principal and interest payments	Monthly/10-yr amort.	[4]
Principal and interest amortization period	10 years
Investment in Collateral	36,100,000
Mortgage notes payable carrying amount	11,900,000		12,300,000
Mortgage notes payable [Member] | Mortgage Notes 6.480% [Member] | Commercial Bank [Member]
Debt Instrument [Line Items]
Mortgage notes	17,400,000	[5]
Effective Interest rate	6.48%	[2],[5]
Maturity Date	2015-05	[5]
Collateral	MOB	[3],[5]
Principal and interest payments	Monthly/10-yr amort.	[4],[5]
Principal and interest amortization period	10 years	[5]
Investment in Collateral	20,200,000	[5]
Mortgage notes payable carrying amount	14,800,000	[5]	14,700,000	[5]
Unaccreted discount	2,700,000
Mortgage notes payable [Member] | Mortgage Notes 6.110% [Member] | Commercial Bank [Member]
Debt Instrument [Line Items]
Mortgage notes	12,000,000	[6]
Effective Interest rate	6.11%	[2],[6]
Maturity Date	2015-07	[6]
Collateral	2 MOBs	[3],[6]
Principal and interest payments	Monthly/10-yr amort.	[4],[6]
Principal and interest amortization period	10 years	[6]
Investment in Collateral	19,400,000	[6]
Mortgage notes payable carrying amount	10,100,000	[6]	10,000,000	[6]
Unaccreted discount	2,100,000
Mortgage notes payable [Member] | Mortgage Notes 7.650% [Member] | Commercial Bank [Member]
Debt Instrument [Line Items]
Mortgage notes	15,200,000	[7],[8]
Effective Interest rate	7.65%	[2],[7],[8]
Maturity Date	2020-07	[8]
Collateral	MOB	[3],[7],[8]
Principal and interest amortization period	11 years
Investment in Collateral	20,200,000	[7],[8]
Mortgage notes payable carrying amount	12,700,000	[7],[8]	12,700,000	[7],[8]
Unaccreted discount	2,400,000	[7],[8]
Period for monthly installments of interest	24 months
Mortgage notes payable [Member] | Mortgage Notes 6.430% [Member] | Commercial Bank [Member]
Debt Instrument [Line Items]
Mortgage notes	12,900,000	[9]
Effective Interest rate	6.43%	[2],[9]
Maturity Date	2021-02	[9]
Collateral	MOB	[3],[9]
Principal and interest payments	Monthly/12-yr amort.	[4],[9]
Principal and interest amortization period	12 years	[9]
Investment in Collateral	20,700,000	[9]
Mortgage notes payable carrying amount	11,000,000	[9]	11,100,000	[9]
Unaccreted discount	1,000,000	[9]
Mortgage notes payable [Member] | Mortgage Notes 5.530% [Member] | Life Insurance Co. [Member]
Debt Instrument [Line Items]
Mortgage notes	7,000,000
Effective Interest rate	5.53%	[2]
Maturity Date	2018-01
Collateral	MOB	[3]
Principal and interest payments	Monthly/15-yr amort.	[4]
Principal and interest amortization period	15 years
Investment in Collateral	14,900,000
Mortgage notes payable carrying amount	1,900,000		2,500,000
Mortgage notes payable [Member] | Mortgage Notes 5.250% [Member] | Investment Co. [Member]
Debt Instrument [Line Items]
Mortgage notes	4,600,000
Effective Interest rate	5.25%	[2]
Maturity Date	2015-09
Collateral	MOB	[3]
Principal and interest payments	Monthly/10-yr amort.	[4]
Principal and interest amortization period	10 years
Investment in Collateral	6,500,000
Mortgage notes payable carrying amount	4,100,000		4,200,000
Mortgage notes payable [Member] | Mortgage Notes 4.700% [Member] | Life Insurance Co. [Member]
Debt Instrument [Line Items]
Mortgage notes	13,900,000	[10]
Effective Interest rate	4.70%	[10],[2]
Maturity Date	2016-01	[10]
Collateral	MOB	[10],[3]
Principal and interest payments	Monthly/25-yr amort.	[10],[4]
Principal and interest amortization period	25 years	[10]
Investment in Collateral	26,700,000	[10]
Mortgage notes payable carrying amount	11,000,000	[10]	11,500,000	[10]
Unamortized premium	300,000	[10]
Mortgage notes payable [Member] | Mortgage Notes 4.700% [Member] | Life Insurance Company - I [Member]
Debt Instrument [Line Items]
Mortgage notes	21,500,000	[11]
Effective Interest rate	4.70%	[11],[2]
Maturity Date	2015-08	[11]
Collateral	MOB	[11],[3]
Principal and interest payments	Monthly/25-yr amort.	[11],[4]
Principal and interest amortization period	25 years	[11]
Investment in Collateral	41,500,000	[11]
Mortgage notes payable carrying amount	16,600,000	[11]	17,400,000	[11]
Unamortized premium	400,000	[11]
Mortgage notes payable [Member] | Mortgage Notes 5.100% [Member] | Insurance Co. [Member]
Debt Instrument [Line Items]
Mortgage notes	7,300,000	[12]
Effective Interest rate	5.10%	[12],[2]
Maturity Date	2018-12	[12]
Collateral	MOB	[12],[3]
Principal and interest payments	Monthly/25-yr amort.	[12],[4]
Principal and interest amortization period	25 years	[12]
Investment in Collateral	13,700,000	[12]
Mortgage notes payable carrying amount	6,800,000	[12]	7,000,000	[12]
Unamortized premium	600,000	[12]
Mortgage notes payable [Member] | Mortgage Notes 4.540% [Member] | Commercial Bank [Member]
Debt Instrument [Line Items]
Mortgage notes	8,100,000	[13]
Effective Interest rate	4.54%	[13],[2]
Maturity Date	2016-08	[13]
Collateral	MOB	[13],[3]
Principal and interest payments	Monthly/10-yr amort.	[13],[4]
Principal and interest amortization period	10 years	[13]
Investment in Collateral	15,700,000	[13]
Mortgage notes payable carrying amount	7,500,000	[13]	7,600,000	[13]
Unamortized premium	500,000	[13]
Mortgage notes payable [Member] | Mortgage Notes 4.060% [Member] | Life Insurance Co. [Member]
Debt Instrument [Line Items]
Mortgage notes	5,300,000	[14]
Effective Interest rate	4.06%	[14],[2]
Maturity Date	2014-11	[14]
Collateral	MOB	[14],[3]
Principal and interest payments	Monthly/25-yr amort.	[14],[4]
Principal and interest amortization period	25 years	[14]
Investment in Collateral	0	[14]
Mortgage notes payable carrying amount	0	[14]	4,300,000	[14]
Number of buildings secured for mortgage note payable	2	[14]
Mortgage notes payable [Member] | Mortgage Notes 4.060% [Member] | Life Insurance Company - I [Member]
Debt Instrument [Line Items]
Mortgage notes	3,100,000	[15]
Effective Interest rate	4.06%	[15],[2]
Maturity Date	2014-11	[15]
Collateral	MOB	[15],[3]
Principal and interest payments	Monthly/25-yr amort.	[15],[4]
Principal and interest amortization period	25 years	[15]
Investment in Collateral	0	[15]
Mortgage notes payable carrying amount	0	[15]	2,500,000	[15]
Mortgage notes payable [Member] | Mortgage Notes 4.000% [Member] | Life Insurance Co. [Member]
Debt Instrument [Line Items]
Mortgage notes	7,900,000	[16]
Effective Interest rate	4.00%	[16],[2]
Maturity Date	2020-08	[16]
Collateral	MOB	[16],[3]
Principal and interest payments	Monthly/15-yr amort.	[16],[4]
Principal and interest amortization period	15 years	[16]
Investment in Collateral	20,700,000	[16]
Mortgage notes payable carrying amount	4,000,000	[16]	4,600,000	[16]
Unamortized premium	300,000	[16]
Mortgage notes payable [Member] | Mortgage Notes 5.25% 20 Year [Member] | Commercial Bank [Member]
Debt Instrument [Line Items]
Mortgage notes	15,000,000	[17]
Effective Interest rate	5.25%	[17],[2]
Maturity Date	2027-04	[17]
Collateral	MOB	[17],[3]
Principal and interest payments	Monthly/20-yr amort	[17],[4]
Principal and interest amortization period	20 years	[17]
Investment in Collateral	33,400,000	[17]
Mortgage notes payable carrying amount	11,900,000	[17]	12,500,000	[17]
Unamortized premium	700,000	[17]
Mortgage notes payable [Member] | Mortgage Notes 5% Thirty Year [Member] | Commercial Bank [Member]
Debt Instrument [Line Items]
Mortgage notes	18,300,000	[13]
Effective Interest rate	5.00%	[13],[2]
Maturity Date	2016-12	[13]
Collateral	MOB	[13],[3]
Principal and interest payments	Monthly/30-yr amort	[13],[4]
Principal and interest amortization period	30 years	[13]
Investment in Collateral	33,600,000	[13]
Mortgage notes payable carrying amount	16,500,000	[13]	17,000,000	[13]
Unamortized premium	500,000	[13]
Mortgage notes payable [Member] | Mortgage Notes 5% 25 Year [Member] | Commercial Bank [Member]
Debt Instrument [Line Items]
Mortgage notes	13,100,000	[1]
Effective Interest rate	5.00%	[1],[2]
Maturity Date	2016-04	[1]
Collateral	MOB	[1],[3]
Principal and interest payments	Monthly/25-yr amort	[1],[4]
Principal and interest amortization period	25 years	[1]
Investment in Collateral	20,100,000	[1]
Mortgage notes payable carrying amount	10,700,000	[1]	11,200,000	[1]
Unamortized premium	200,000	[1]
Mortgage notes payable [Member] | Mortgage Notes 4.860% [Member] | Life Insurance Co. [Member]
Debt Instrument [Line Items]
Mortgage notes	7,300,000	[18]
Effective Interest rate	4.86%	[18],[2]
Maturity Date	2020-08	[18]
Collateral	MOB	[18],[3]
Principal and interest payments	Monthly/27-yr amort	[18],[4]
Principal and interest amortization period	27 years	[18]
Investment in Collateral	17,800,000	[18]
Mortgage notes payable carrying amount	7,100,000	[18]	0	[18]
Unamortized premium	400,000	[18]
Mortgage notes payable [Member] | Mortgage Notes 4.790% [Member] | Municipal Government [Member]
Debt Instrument [Line Items]
Mortgage notes	11,900,000	[19],[20]
Effective Interest rate	4.79%	[19],[2],[20]
Collateral	MOB	[19],[20],[3]
Principal and interest payments	Semi-Annual (18)	[19],[20],[4]
Investment in Collateral	20,900,000	[19],[20]
Mortgage notes payable carrying amount	12,300,000	[19],[20]	0	[19],[20]
Unamortized premium	$1,000,000	[19],[20]
Number of buildings secured for mortgage note payable	4	[19],[20]
Number of outstanding mortgage notes	4
[1]	The unamortized portion of the $0.2 million premium recorded on this note upon acquisition is included in the balance above.
[2]	The contractual interest rates for the 22 outstanding mortgage notes ranged from 5.0% to 7.6% as of December 31, 2014.
[3]	MOB-Medical office building; OTH-Other.
[4]	Payable in monthly installments of principal and interest with the final payment due at maturity (unless otherwise noted).
[5]	The unaccreted portion of a $2.7 million discount recorded on this note upon acquisition is included in the balance above.
[6]	The unaccreted portion of a $2.1 million discount recorded on this note upon acquisition is included in the balance above.
[7]	Payable in monthly installments of interest only for 24 months and then installments of principal and interest based on an 11-year amortization with the final payment due at maturity.
[8]	The unaccreted portion of a $2.4 million discount recorded on this note upon acquisition is included in the balance above.
[9]	The unaccreted portion of a $1.0 million discount recorded on this note upon acquisition is included in the balance above.
[10]	The unamortized portion of a $0.3 million premium recorded on this note upon acquisition is included in the balance above.
[11]	The unamortized portion of a $0.4 million premium recorded on this note upon acquisition is included in the balance above.
[12]	The unamortized portion of the $0.6 million premium recorded on this note upon acquisition is included in the balance above.
[13]	The unamortized portion of the $0.5 million premium recorded on this note upon acquisition is included in the balance above.
[14]	Balance consists of two notes secured by the same building. The company repaid these notes in October 2014.
[15]	The company repaid this mortgage note in October 2014.
[16]	The unamortized portion of the $0.3 million premium recorded on this note upon acquisition is included in the balance above.
[17]	The unamortized portion of the $0.7 million premium recorded on this note upon acquisition is included in the balance above.
[18]	The unamortized portion of the $0.4 million premium recorded on this note upon acquisition is included in the balance above.
[19]	The unamortized portion of the $1.0 million premium recorded on the four notes upon acquisition is included in the balance above.
[20]	Balance consists of four notes secured by the same building.

Notes_and_Bonds_Payable_Future

Notes and Bonds Payable - Future Maturities (Details) (USD $)	Dec. 31, 2014		Dec. 31, 2013
	mortgage_note_payable
Long Term Debt Maturities [Line Items]
Number of outstanding mortgage notes	17
Future contractual maturities of the Company's notes and bonds payable
Principal Maturities	$1,407,530,000
Net Accretion/Amortization	-3,838,000	[1]
Notes and bonds payable	1,403,692,000	[2]	1,348,459,000	[2]
%	100.00%
2015 [Member]
Future contractual maturities of the Company's notes and bonds payable
Principal Maturities	50,826,000
Net Accretion/Amortization	-624,000	[1]
Notes and bonds payable	50,202,000
%	3.60%
2016 [Member]
Future contractual maturities of the Company's notes and bonds payable
Principal Maturities	58,698,000
Net Accretion/Amortization	-473,000	[1]
Notes and bonds payable	58,225,000
%	4.10%
2017 [Member]
Future contractual maturities of the Company's notes and bonds payable
Principal Maturities	388,181,000
Net Accretion/Amortization	-473,000	[1]
Notes and bonds payable	387,708,000
%	27.60%
2018 [Member]
Future contractual maturities of the Company's notes and bonds payable
Principal Maturities	8,420,000
Net Accretion/Amortization	-496,000	[1]
Notes and bonds payable	7,924,000
%	0.60%
2019 [Member]
Future contractual maturities of the Company's notes and bonds payable
Principal Maturities	202,633,000
Net Accretion/Amortization	-636,000	[1]
Notes and bonds payable	201,997,000
%	14.40%
2020 and thereafter [Member]
Future contractual maturities of the Company's notes and bonds payable
Principal Maturities	698,772,000
Net Accretion/Amortization	-1,136,000	[1]
Notes and bonds payable	$697,636,000
%	49.70%
[1]	Includes discount accretion and premium amortization related to the Company’s Senior Notes due 2017, Senior Notes due 2021, Senior Notes due 2023, and 17 mortgage notes payable.
[2]	Level 3 - Fair value derived from valuation techniques in which one of more significant inputs or significant value drivers are unobservable.

Notes_and_Bonds_Payable_Narrat

Notes and Bonds Payable - Narrative (Details) (USD $)	1 Months Ended	9 Months Ended	1 Months Ended	0 Months Ended	12 Months Ended					1 Months Ended
	Feb. 15, 2013	Sep. 30, 2014	Feb. 28, 2014	Feb. 15, 2013	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012	Feb. 17, 2015	Oct. 14, 2011	Dec. 13, 2010	Mar. 26, 2013	Dec. 04, 2009
				extension_option							Lender
Debt Instrument [Line Items]
Notes and bonds payable					$1,403,692,000	[1]	$1,348,459,000	[1]
Unamortized discount (premium)					3,838,000	[2]
Unsecured Credit Facility due 2017 [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Anticipated write off of unamortized deferred financing costs	300,000
Medium-term Notes [Member] | Unsecured Term Loan Due 2019 [Member]
Debt Instrument [Line Items]
Notes and bonds payable					200,000,000		0
Long-term Debt, Weighted Average Interest Rate					1.60%
Senior notes face value			200,000,000
Number of Lenders Term Loan			9
Contractual interest rates, basis spread on variable rate		1.45%
Medium-term Notes [Member] | Unsecured Term Loan Due 2019 [Member] | Minimum [Member]
Debt Instrument [Line Items]
Contractual interest rates, basis spread on variable rate			1.00%
Medium-term Notes [Member] | Unsecured Term Loan Due 2019 [Member] | Maximum [Member]
Debt Instrument [Line Items]
Contractual interest rates, basis spread on variable rate			1.95%
Line of Credit [Member] | Unsecured Credit Facility due 2017 [Member]
Debt Instrument [Line Items]
Notes and bonds payable					85,000,000		238,000,000
Unsecured credit facility											700,000,000
Number of Lenders of unsecured credit facility											17
Number of extension options				2
Period of extension option				6 months
Extension fees as percentage of aggregate commitments				0.08%
Facility fee on the aggregate amount of commitments				0.30%
Amount outstanding under Unsecured Credit Facility					85,000,000
Weighted average interest rate (LOC)					1.60%
Remaining borrowing capacity					615,000,000
Line of Credit [Member] | Unsecured Credit Facility due 2017 [Member] | Minimum [Member]
Debt Instrument [Line Items]
Facility fee on the aggregate amount of commitments				0.15%
Line of Credit [Member] | Unsecured Credit Facility due 2017 [Member] | Maximum [Member]
Debt Instrument [Line Items]
Facility fee on the aggregate amount of commitments				0.35%
Deferred finance costs, gross	2,700,000			2,700,000
Senior Notes [Member] | 5.750% Senior Notes Due 2021 [Member]
Debt Instrument [Line Items]
Notes and bonds payable					397,864,000		397,578,000
Senior notes face value					400,000,000		400,000,000					400,000,000
Interest rate on senior notes					5.75%							5.75%
Unaccreted discount					2,136,000		2,422,000
Unamortized discount (premium)												3,200,000
Interest rate yielded per annum upon issuance												5.86%
Amount of amortization included in interest expense on the Company's consolidated Statements of operations					300,000
Senior Notes [Member] | 3.75% Senior Notes Due 2023 [Member]
Debt Instrument [Line Items]
Notes and bonds payable					248,253,000		248,077,000
Senior notes face value					250,000,000		250,000,000						250,000,000
Interest rate on senior notes					3.75%								3.75%
Unaccreted discount					1,747,000		1,923,000						2,100,000
Interest rate yielded per annum upon issuance													3.85%
Amount of amortization included in interest expense on the Company's consolidated Statements of operations					200,000		100,000
Senior Notes [Member] | 6.500% Senior Notes Due 2017 [Member]
Debt Instrument [Line Items]
Notes and bonds payable					299,308,000		299,008,000
Senior notes face value					300,000,000		300,000,000							300,000,000
Interest rate on senior notes					6.50%									6.50%
Unaccreted discount					692,000		992,000
Unamortized discount (premium)														2,000,000
Authorized Repurchase Of Debt Amount					50,000,000
Interest rate yielded per annum upon issuance														6.62%
Amount of amortization included in interest expense on the Company's consolidated Statements of operations					300,000
Mortgage notes payable [Member] | 5.000%-7.63% Mortgage Notes Payable [Member]
Debt Instrument [Line Items]
Notes and bonds payable					173,267,000		165,796,000
Senior notes face value					172,530,000		166,684,000
Unaccreted discount					2,468,000		3,596,000
Amortization of debt discount					1,100,000		1,200,000		1,000,000
Amortization of debt premium					1,000,000		700,000		700,000
LIBOR [Member] | Medium-term Notes [Member] | Unsecured Term Loan Due 2019 [Member]
Debt Instrument [Line Items]
Contractual interest rates, basis spread on variable rate					1.45%
LIBOR [Member] | Line of Credit [Member] | Unsecured Credit Facility due 2017 [Member]
Debt Instrument [Line Items]
Percentage of interest in addition to LIBOR				1.40%
Contractual interest rates, basis spread on variable rate					1.40%
LIBOR [Member] | Line of Credit [Member] | Unsecured Credit Facility due 2017 [Member] | Minimum [Member]
Debt Instrument [Line Items]
Percentage of interest in addition to LIBOR				0.95%
LIBOR [Member] | Line of Credit [Member] | Unsecured Credit Facility due 2017 [Member] | Maximum [Member]
Debt Instrument [Line Items]
Percentage of interest in addition to LIBOR				1.75%
Subsequent Event [Member] | Senior Notes [Member] | 5.45% Secured Note [Member]
Debt Instrument [Line Items]
Extinguishment of Debt, Amount										15,000,000
Interest rate on senior notes										5.45%
Accrued interest as of redemption date										$100,000
[1]	Level 3 - Fair value derived from valuation techniques in which one of more significant inputs or significant value drivers are unobservable.
[2]	Includes discount accretion and premium amortization related to the Company’s Senior Notes due 2017, Senior Notes due 2021, Senior Notes due 2023, and 17 mortgage notes payable.

Stockholders_Equity_Common_sha

Stockholders' Equity - Common shares (Details)	0 Months Ended		12 Months Ended
	Jul. 19, 2013	Sep. 28, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reconciliation of the beginning and ending common stock outstanding
Issuance of common stock	3,000,000	9,200,000
Balance, end of year			98,828,000	95,924,000
Common Stock [Member]
Reconciliation of the beginning and ending common stock outstanding
Balance, beginning of year			95,924,339	87,514,336	77,843,883
Issuance of common stock			3,073,445	8,293,369	9,275,895
Non-vested stock-based awards, net of withheld shares and forfeitures			-169,686	116,634	394,558
Balance, end of year			98,828,098	95,924,339	87,514,336

Stockholders_Equity_At_the_Mar

Stockholders' Equity - At the Market Equity Offering Program (Details) (USD $)	0 Months Ended		12 Months Ended			1 Months Ended
In Thousands, except Share data, unless otherwise specified	Jul. 19, 2013	Sep. 28, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jan. 31, 2015
Class of Stock [Line Items]
Issuance of common stock	3,000,000	9,200,000
Net proceeds from issuance of common stock	$78,300	$201,100	$76,856	$220,252	$202,352
At The Market Equity Offering Program [Member]
Class of Stock [Line Items]
Issuance of common stock			3,009,761	5,207,871
Net proceeds from issuance of common stock			75,700	140,600
Number of authorized shares remaining under offering program			2,381,639
Minimum [Member] | At The Market Equity Offering Program [Member]
Class of Stock [Line Items]
Issuance of common stock (price per share)			$24.35	$24.19
Maximum [Member] | At The Market Equity Offering Program [Member]
Class of Stock [Line Items]
Issuance of common stock (price per share)			$27.53	$30.49
Subsequent Event [Member] | At The Market Equity Offering Program [Member]
Class of Stock [Line Items]
Issuance of common stock						531,153
Net proceeds from issuance of common stock						$14,900

Stockholders_Equity_Change_in_

Stockholders' Equity - Change in Ownership of Less-than-wholly-owned Subsidiary (Details) (USD $)

3 Months Ended

12 Months Ended

In Thousands, unless otherwise specified

Dec. 31, 2014

Sep. 30, 2014

Jun. 30, 2014

Mar. 31, 2014

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Noncontrolling Interest [Line Items]

Net income attributable to common stockholders

$18,073

[1]

$4,153

[2]

$6,011

[3]

$3,963

[4]

$12,456

[5]

$19,783

[6]

($24,238)

[7]

($1,018)

[8]

$32,200

$6,983

$5,535

Net transfers to the noncontrolling interest

-8,189

Change to the Company's total stockholders' equity from net income attributable to common stockholders and transfers to noncontrolling interest

25,310

6,946

5,465

Cumulative net income attributable to common stockholders [Member]

Noncontrolling Interest [Line Items]

Net income attributable to common stockholders

31,887

6,946

5,465

Additional Paid-in Capital [Member]

Noncontrolling Interest [Line Items]

Net decrease in the Company's additional paid-in capital for purchase of subsidiary partnership interest

6,577

Net transfers to the noncontrolling interest

($6,577)

[1]

The increases in net income and amounts per share for the fourth quarter of 2014 are primarily attributable to gains on sales of real estate totaling $9.3 million, partially offset by impairment charges of $1.0 million.

[2]

The decreases in net income and amounts per share for the third quarter of 2014 are primarily attributable to impairment charges of

[3]

The increases in net income and amounts per share for the second quarter of 2014 are primarily attributable to a $1.9 million cash reimbursement received by the Company for certain operating expenses paid by the Company for years 2006 through 2013

[4]

The decreases in net income and amounts per share for the first quarter of 2014 are primarily attributable to impairment charges of $3.4 million.

[5]

The increases in net income and amounts per share for the fourth quarter of 2013 are primarily attributable to gains on sales of real estate totaling $2.7 million.

[6]

The increases in net income and amounts per share for the third quarter of 2013 are primarily attributable to gains on sales of real estate totaling $20.2 million, partially offset by impairment charges of $6.3 million.

[7]

The decreases in net income and amounts per share for the second quarter of 2013 are primarily attributable to losses of extinguishment of debt of $29.9 million, of which $0.3 million is included in discontinued operations. This amount is partially offset by gains on sales of real estate totaling $1.8 million.

[8]

The decreases in net income and amounts per share for the first quarter of 2013 are primarily attributable to impairment charges of $3.6 million.

Stockholders_Equity_Accumulate

Stockholders' Equity - Accumulated Other Comprehensive Income (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Equity [Abstract]
Balance, beginning of period	$51	($2,092)
Other comprehensive income (loss) before reclassifications	-1,850	1,952
Amounts reclassified from accumulated other comprehensive income (loss)	-720	191
Other comprehensive income (loss)	-2,570	2,143	1,240
Balance, end of period	($2,519)	$51	($2,092)

Stockholders_Equity_Reclassifi

Stockholders' Equity - Reclassifications out of Accumulated Other Comprehensive Income (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
General and Administrative Expense	($22,808)	($23,704)	($20,881)
Amounts reclassified from accumulated other comprehensive income (loss)	-720	191
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amounts reclassified from accumulated other comprehensive income (loss)	-720
Prior service costs | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
General and Administrative Expense	-1,189
Actuarial loss | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
General and Administrative Expense	$469

Stockholders_Equity_Narrative_

Stockholders' Equity - Narrative (Details) (USD $)	0 Months Ended		3 Months Ended				12 Months Ended			0 Months Ended
	Jul. 19, 2013	Sep. 28, 2012	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Feb. 03, 2015	Dec. 31, 2006
Stockholders Equity (Textual) [Abstract]
Common stock, outstanding shares			98,828,000				98,828,000	95,924,000
Issuance of common stock	3,000,000	9,200,000
Common stock, par value (in dollars per share)			$0.01				$0.01	$0.01
Gross price per share		$23.87
Net price per share	$26.13	$22.85
Proceeds from issuance of common stock, net	$78,300,000	$201,100,000					$76,856,000	$220,252,000	$202,352,000
Dividend per share to common stockholders, paid (in dollars per share)			$0.30	$0.30	$0.30		$1.20	$1.20	$1.20
Dividends per share to common stockholders, declared (in dollars per share)						$0.30
Number of common shares authorized to be repurchased											3,000,000
Other comprehensive income loss reduction in future benefit obligations related to pension plan							$2,600,000	$2,100,000
Subsequent Event [Member] | Dividend Declared [Member]
Stockholders Equity (Textual) [Abstract]
Dividends per share to common stockholders, declared (in dollars per share)										$0.30
Chief Executive Officer [Member]
Stockholders Equity (Textual) [Abstract]
Common stock, outstanding shares			784,669				784,669
Chief Executive Officer [Member] | Restricted Stock [Member]
Stockholders Equity (Textual) [Abstract]
Shares vested in period (shares)							838,886
Shares forfeited by CEO and then redeemed by the Company to satisfy minimum tax withholding requirements							351,913
Common stock, outstanding shares			87,779				87,779

Benefit_Plans_Details

Benefit Plans (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net periodic benefit cost for both the Executive Retirement Plan and the Outside Director Plan
Service cost	$88	$86	$77
Interest cost	687	597	725
Amortization of prior service cost	-1,189	-1,189	-723
Amortization of net gain	469	1,380	990
Total	55	874	1,069
Net (gain) loss recognized in Accumulated other comprehensive income (loss)	2,570	-2,143	-1,240
Total recognized in net periodic benefit gain and Accumulated other comprehensive income (loss)	$2,625	($1,269)	($171)

Benefit_Plans_Details_1

Benefit Plans (Details 1) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Change in benefit obligation
Benefit obligation at beginning of year	$13,890	$15,201
Service cost	88	86	77
Interest cost	687	597	725
Benefits paid	-42	-42
Actuarial (gain) loss, net	1,850	-1,952
Benefit obligation at end of year	16,473	13,890	15,201
Amounts recognized in the Consolidated Balance Sheets
Net liabilities included in other liabilities	-13,954	-13,941
Amounts recognized in accumulated other comprehensive income (loss)	($2,519)	$51

Benefit_Plans_Details_2

Benefit Plans (Details 2)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Compensation and Retirement Disclosure [Abstract]
Discount rates	4.08%	4.92%	3.91%
Compensation increases	2.70%	2.70%	2.70%

Benefit_Plans_Details_Textual

Benefit Plans (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2008
	officer	officer
Defined Benefit Plan Disclosure [Line Items]
Number of employees covered by the Company's pension plan	3
Amount included in accumulated other comprehensive loss will be amortized to expense in 2012	$400,000
Executive Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of employees covered by the Company's pension plan	3
Minimum age to receive pension benefits	65 years
Minimum years of service to receive pension benefits	5 years
Defined benefit plans, general information	equal to 60% of the officer’s final average earnings (defined as the average of the executive’s highest three years’ earnings) plus 6% of final average earnings multiplied by the years of service after age 60 (but not more than five years), less 100% of certain other retirement benefits
Percentage of average earnings of officer as pension benefits amount	60.00%
Years of highest earnings to calculate the average earnings	3 years
Additional amount to be given as pension benefits is percentage of final average	6.00%
Minimum year of service used to calculate average earnings for final average earnings	60 years
Years of earning to calculate average final earnings maximum	5 years
Percentage of certain other benefits to be deducted from final amount of pension	100.00%
Maximum annual benefits payable under the Executive Retirement Plan, frozen subject to cost-of-living adjustments		896,000
Number of officers eligible for pension benefits excluding chief executive officer		2
Number of officers which elected to receive benefits monthly upon retirement		1
Number of officers which elected to receive benefits in one lump sum upon retirement		1
Annual Installment to be Paid to CEO as pension benefits upon retirement	$900,000

Stock_and_Other_Incentive_Plan2

Stock and Other Incentive Plans (Details) (Restricted Stock and Performance Based Awards [Member], USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Restricted Stock and Performance Based Awards [Member]
Summary of the activity under the incentive plans
Stock-based awards, beginning of year	1,788,168	1,770,061	1,430,675
Granted	269,129	134,752	397,917
Vested	-931,767	-116,645	-58,531
Forfeited	-67,798	0	0
Stock-based awards, end of year	1,057,732	1,788,168	1,770,061
Weighted-average grant date fair value of:
Stock-based awards, beginning of year	$23.81	$23.97	$24.42
Stock-based awards granted during the year	$25.27	$23.90	$22.35
Stock-based awards vested during the year	$24.13	$26.35	$23.99
Stock-based awards forfeited during the year	$22.01	$0	$0
Stock-based awards, end of year	$24.01	$23.81	$23.97
Grant date fair value of shares granted during the year	$6,800,122	$3,220,623	$8,894,424

Stock_and_Other_Incentive_Plan3

Stock and Other Incentive Plans (Details 1) (Employees Stock Purchase Plan [Member], USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Employees Stock Purchase Plan [Member]
Stock Options Outstanding (in shares):
Options outstanding, beginning of year	391,108	433,452	425,196
Granted	275,655	246,717	327,936
Exercised	-51,078	-69,076	-59,163
Forfeited	-63,908	-49,434	-78,202
Expired	-157,875	-170,551	-182,315
Outstanding, end of period	393,902	391,108	433,452
Exercisable, end of year	391,108	433,452	425,196
Weighted-average exercise price of (in dollars per share):
Options outstanding, beginning of year	$17.05	$16.78	$15.80
Options granted during the year	$18.11	$20.41	$15.80
Options exercised during the year	$17.76	$17.09	$16.18
Options forfeited during the year	$18.58	$17.98	$16.74
Options expired during the year	$15.80	$17.99	$18.24
Options outstanding, end of year	$19.17	$17.05	$16.78
Weighted-average fair value of options granted during the year (calculated as of the grant date)	$4.35	$5.08	$4.13
Intrinsic value of options exercised during the year	$436,547	$375,335	$439,645
Intrinsic value of options outstanding (calculated as of December 31)	3,209,456	1,665,331	3,132,506
Intrinsic value of options exercisable (calculated as of December 31)	$1,665,331	$3,132,506	$1,186,297
Exercise prices of options outstanding (calculated as of December 31)	$19.17	$17.05	$16.78
Weighted-average contractual life of outstanding options (calculated as of December 31, in years)	9 months 18 days	9 months 18 days	9 months 18 days

Stock_and_Other_Incentive_Plan4

Stock and Other Incentive Plans (Details 2)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Fair value of options issued based on weighted-average assumptions
Risk-free interest rates	0.38%	0.25%	0.25%
Expected dividend yields	4.94%	5.17%	6.17%
Expected life (in years)	1 year 4 months 21 days	1 year 4 months 6 days	1 year 5 months 16 days
Expected volatility	23.00%	25.60%	30.30%
Expected forfeiture rates	75.00%	85.00%	70.00%

Stock_and_Other_Incentive_Plan5

Stock and Other Incentive Plans (Details Textual) (USD $)	12 Months Ended			3 Months Ended			0 Months Ended	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2012	Jul. 31, 2012	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
401(k) Plan [Abstract]
Percentage of matching contribution	3.00%
Value of matching contribution	$400,000	$400,000	$400,000
Discount on market price on the date of grant	85.00%
Discount on market price on the date of exercise	85.00%
Restricted Stock and Performance Based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted in period (in shares)	269,129	134,752	397,917
Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorization of common shares to issue	2,390,272
Common shares issued, net of forfeitures	1,816,580	1,693,266	1,576,632
Number of shares authorized	573,692	697,006	813,640			813,640
Stock Incentive Plan [Member] | Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Share-based compensation expense	500,000	600,000	600,000
Shares issued under the plan	26,677	20,256	27,864
Stock Incentive Plan [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	3,600,000	4,300,000	2,500,000
Withheld of common stock	371,017	18,118	3,359
Stock Incentive Plan [Member] | Restricted Stock [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Stock Incentive Plan [Member] | Restricted Stock [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	8 years
Stock Incentive Plan [Member] | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Value of performance based awards released				600,000		3,600,000
Shares issued under the plan				27,094	0	154,696
Stock Incentive Plan [Member] | Performance Shares [Member] | Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period				8 years
Number of executive officers granted awards				3
Shares issued under the plan				2,968
Stock Incentive Plan [Member] | Performance Shares [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period						3 years
Stock Incentive Plan [Member] | Performance Shares [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period						8 years
Stock Incentive Plan [Member] | Performance Shares [Member] | Weighted Average [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period						6 years
Stock Incentive Plan [Member] | Restricted Stock and Performance Based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average amortization period remaining	3 years 8 months 12 days
Stock Incentive Plan [Member] | Restricted Stock and Performance Based Awards [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Stock Incentive Plan [Member] | Restricted Stock and Performance Based Awards [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	8 years
Executive Incentive Program [Member] | Performance Shares [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shareholder return performance period used to measure award							1 year
Executive Incentive Program [Member] | Performance Shares [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shareholder return performance period used to measure award							3 years
Executive Incentive Program [Member] | 2014 Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Granted in period	3,900,000
Granted in period (in shares)	140,930
Executive Incentive Program [Member] | 2014 Performance Shares [Member] | Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of executive officers granted awards	5
Executive Incentive Program [Member] | 2014 Performance Shares [Member] | Senior Vice President [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of executive officers granted awards	5
Executive Incentive Program [Member] | 2013 Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		3 years
Share-based compensation expense	300,000
Granted in period		1,000,000
Granted in period (in shares)		47,709
Executive Incentive Program [Member] | 2013 Performance Shares [Member] | Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of executive officers granted awards		5
Executive Incentive Program [Member] | 2013 Performance Shares [Member] | Senior Vice President [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of executive officers granted awards		6
Executive Incentive Program [Member] | 2012 Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			3 years
Share-based compensation expense	900,000	900,000
Granted in period			2,700,000
Granted in period (in shares)			112,132
Executive Incentive Program [Member] | 2012 Performance Shares [Member] | Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of executive officers granted awards			5			5
Salary Deferral Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued under the plan	71,460	66,787	89,421
Maximum salary deferral for officers under the plan, percent	50.00%
Dividend Reinvestment Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorization of common shares to issue	1,000,000
401(k) Plan [Abstract]
Total DRIP shares issued under the Plan	532,071
Total shares issued under the Dividend Reinvestment Plan	12,606	16,422	16,732
Employees Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized	88,495	142,367	169,099			169,099
401(k) Plan [Abstract]
Value of shares available for grant each year	25,000
Discount on market price on the date of grant	85.00%
Discount on market price on the date of exercise	85.00%
Option expiration period	27 months
Cash received from employees upon exercising options	1,200,000	1,300,000	1,000,000
Deferral Option One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Salary Deferral Plan employer matching contribution, percent	30.00%
Deferral Option One [Member] | Salary Deferral Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Deferral Option Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Salary Deferral Plan employer matching contribution, percent	50.00%
Deferral Option Two [Member] | Salary Deferral Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	5 years
Deferral Option Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Salary Deferral Plan employer matching contribution, percent	100.00%
Deferral Option Three [Member] | Salary Deferral Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	8 years
Scenario, Forecast [Member] | Executive Incentive Program [Member] | 2014 Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense								1,300,000	1,300,000	1,300,000
Scenario, Forecast [Member] | Executive Incentive Program [Member] | 2013 Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense									300,000	300,000
Scenario, Forecast [Member] | Executive Incentive Program [Member] | 2012 Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense										$900,000

Earnings_Per_Share_Details

Earnings Per Share (Details) (USD $)	3 Months Ended																12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Weighted Average Common Shares
Weighted average Common Shares outstanding																	97,093,960	92,725,112	80,360,422
Non-vested shares																	-1,814,734	-1,784,485	-1,515,582
Weighted average Common Shares - Basic																	95,279,226	90,940,627	78,844,840
Dilutive effect of non-vested shares																	1,364,236
Dilutive effect of employee stock purchase plan																	115,948
Weighted average Common Shares - Diluted																	96,759,410	90,940,627	78,844,840
Net Income (loss)
Income from continuing operations	$9,060	[1]	$8,437	[2]	$9,005	[3]	$7,477	[4]	$9,656	[5]	$4,511	[6]	($27,861)	[7]	$602	[8]	$33,979	($13,092)	($892)
Less: Net income attributable to noncontrolling interests	0	[1]	-162	[2]	-40	[3]	-111	[4]	-72	[5]	-17	[6]	33	[7]	19	[8]	-313	-37	-70
Income (loss) from continuing operations attributable to common stockholders																	33,666	-13,129	-962
Discontinued operations	9,013	[1]	-4,284	[2]	-2,994	[3]	-3,514	[4]	2,800	[5]	15,272	[6]	3,623	[7]	-1,620	[8]	-1,779	20,075	6,427
NET INCOME ATTRIBUTABLE TO COMMON STOCKHOLDERS	$18,073	[1]	$3,991	[2]	$5,971	[3]	$3,852	[4]	$12,384	[5]	$19,766	[6]	($24,205)	[7]	($999)	[8]	$31,887	$6,946	$5,465
Basic Earnings (Loss) Per Common Share
Income (loss) from continuing operations (in dollars per share)																	$0.35	($0.14)	($0.01)
Discontinued operations (in dollars per share)																	($0.02)	$0.22	$0.08
Net income (loss) attributable to common stockholders (in dollars per share)	$0.19	[1]	$0.04	[2]	$0.06	[3]	$0.04	[4]	$0.13	[5]	$0.21	[6]	($0.27)	[7]	($0.01)	[8]	$0.33	$0.08	$0.07
Diluted Earnings (Loss) Per Common Share
Income (loss) from continuing operations (in dollars per share)																	$0.35	($0.14)	($0.01)
Discontinued operations (in dollars per share)																	($0.02)	$0.22	$0.08
Net income (loss) attributable to common stockholders (in dollars per share)	$0.18	[1]	$0.04	[2]	$0.06	[3]	$0.04	[4]	$0.13	[5]	$0.21	[6]	($0.27)	[7]	($0.01)	[8]	$0.33	$0.08	$0.07
[1]	The increases in net income and amounts per share for the fourth quarter of 2014 are primarily attributable to gains on sales of real estate totaling $9.3 million, partially offset by impairment charges of $1.0 million.
[2]	The decreases in net income and amounts per share for the third quarter of 2014 are primarily attributable to impairment charges of
[3]	The increases in net income and amounts per share for the second quarter of 2014 are primarily attributable to a $1.9 million cash reimbursement received by the Company for certain operating expenses paid by the Company for years 2006 through 2013
[4]	The decreases in net income and amounts per share for the first quarter of 2014 are primarily attributable to impairment charges of $3.4 million.
[5]	The increases in net income and amounts per share for the fourth quarter of 2013 are primarily attributable to gains on sales of real estate totaling $2.7 million.
[6]	The increases in net income and amounts per share for the third quarter of 2013 are primarily attributable to gains on sales of real estate totaling $20.2 million, partially offset by impairment charges of $6.3 million.
[7]	The decreases in net income and amounts per share for the second quarter of 2013 are primarily attributable to losses of extinguishment of debt of $29.9 million, of which $0.3 million is included in discontinued operations. This amount is partially offset by gains on sales of real estate totaling $1.8 million.
[8]	The decreases in net income and amounts per share for the first quarter of 2013 are primarily attributable to impairment charges of $3.6 million.

Earnings_Per_Share_Details_Tex

Earnings Per Share (Details Textual)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Employee Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock excluded from the calculation of diluted loss per common share	157,733	138,578
Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock excluded from the calculation of diluted loss per common share	1,288,166	1,144,465

Commitments_and_Contingencies_1

Commitments and Contingencies - Minimum lease payments (Details) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Future minimum lease payments due to the Company under property operating agreements
2015	$5,001
2016	5,070
2017	5,129
2018	5,154
2019	5,250
2020 and thereafter	286,699
Total	$312,303

Commitments_and_Contingencies_2

Commitments and Contingencies - Narrative (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
	sqft
	litigation_settlement
	property
Property, Plant and Equipment [Line Items]
Number of ground leases related to real estate investments under operating lease agreements	45
Operating lease expiration period maximum expiration date	2105
Approximately corporate office lease covers of rented space	36,653
Percentage on increases of annual base rent on the corporate office lease	3.25%
Rental expense relating to the operating leases	$4,900,000	$4,400,000	$4,300,000
Prepaid ground leases which represented rental expense	500,000
Number of claims settled	1
General and Administrative Expense [Member]
Property, Plant and Equipment [Line Items]
Litigation expense	950,000
Second Generation Leases [Member] | Tenant Improvement Allowances [Member]
Property, Plant and Equipment [Line Items]
Anticipated amount of investment	13,400,000
Corporate Office Lease [Member]
Property, Plant and Equipment [Line Items]
Corporate lease expiration date	31-Oct-20
Minimum [Member] | First Generation Leases [Member] | Tenant Improvement Allowances [Member]
Property, Plant and Equipment [Line Items]
Anticipated amount of investment	11,900,000
Maximum [Member] | First Generation Leases [Member] | Tenant Improvement Allowances [Member]
Property, Plant and Equipment [Line Items]
Anticipated amount of investment	$15,600,000

Other_Data_Details

Other Data (Details) (USD $)	3 Months Ended																12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Income Tax Disclosure [Abstract]
NET INCOME ATTRIBUTABLE TO COMMON STOCKHOLDERS	$18,073	[1]	$3,991	[2]	$5,971	[3]	$3,852	[4]	$12,384	[5]	$19,766	[6]	($24,205)	[7]	($999)	[8]	$31,887		$6,946		$5,465
Reconciling items to taxable income:
Depreciation and amortization																	28,332		26,240		28,526
Gain or loss on disposition of depreciable assets																	-4,940		-3,656		922
Impairments																	0		6,222		3,807
Straight-line rent																	-12,203		-6,493		-6,075
Receivable allowances																	2,074		-716		-74
Stock-based compensation																	2,020		5,817		5,400
Other																	1,213		-1,866		8,917
Reconciling items to taxable income, total																	16,496		25,548		41,423
Taxable income																	48,383	[9]	32,494	[9]	46,888	[9]
Dividends paid																	$116,371		$111,571		$96,356
[1]	The increases in net income and amounts per share for the fourth quarter of 2014 are primarily attributable to gains on sales of real estate totaling $9.3 million, partially offset by impairment charges of $1.0 million.
[2]	The decreases in net income and amounts per share for the third quarter of 2014 are primarily attributable to impairment charges of
[3]	The increases in net income and amounts per share for the second quarter of 2014 are primarily attributable to a $1.9 million cash reimbursement received by the Company for certain operating expenses paid by the Company for years 2006 through 2013
[4]	The decreases in net income and amounts per share for the first quarter of 2014 are primarily attributable to impairment charges of $3.4 million.
[5]	The increases in net income and amounts per share for the fourth quarter of 2013 are primarily attributable to gains on sales of real estate totaling $2.7 million.
[6]	The increases in net income and amounts per share for the third quarter of 2013 are primarily attributable to gains on sales of real estate totaling $20.2 million, partially offset by impairment charges of $6.3 million.
[7]	The decreases in net income and amounts per share for the second quarter of 2013 are primarily attributable to losses of extinguishment of debt of $29.9 million, of which $0.3 million is included in discontinued operations. This amount is partially offset by gains on sales of real estate totaling $1.8 million.
[8]	The decreases in net income and amounts per share for the first quarter of 2013 are primarily attributable to impairment charges of $3.6 million.
[9]	Before REIT dividend paid deduction.

Other_Data_Details_1

Other Data (Details 1) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Characterization of distributions on common stock
Ordinary income per share	$0.50	$0.27	$0.63
Return of capital per share	$0.70	$0.80	$0.56
Unrecaptured section 1250 gain per share	$0	$0.13	$0.01
Common stock distributions per share	$1.20	$1.20	$1.20
Ordinary income in percent of common stock distribution	42.00%	22.20%	52.30%
Return of capital in percent of common stock distribution	58.00%	66.30%	47.10%
Unrecaptured section 1250 gain in percent of common stock distribution	0.00%	11.50%	0.60%
Common stock distribution in percentage	100.00%	100.00%	100.00%

Other_Data_Details_2

Other Data (Details 2) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
State income tax expense:
Texas gross margin tax	$694	[1]	$649	[1]	$843	[1]
Other	58		23		3
Total state income tax expense	752		672		846
State income tax payments, net of refunds and collections	$593		$768		$627
[1]	In the table above, income tax expense for 2014 and 2012 includes approximately $0.1 million that was recorded to the gain on sale of real estate properties sold, which is included in discontinued operations rather than general and administrative expenses on the Company’s Consolidated Statements of Operations.

Other_Data_Details_Textual

Other Data (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2012	Dec. 31, 2013
Other Data (Textual) [Abstract]
Condition to qualify as a REIT as defined under the Internal Revenue Code	Company must meet a number of organizational and operational requirements, including a requirement that it currently distribute at least 90% of its taxable income to its stockholders.
Estimated aggregate total cost of total assets for federal income tax purposes	$3,300,000,000	$2,800,000,000	$3,100,000,000
Number of preferred shares outstanding	0	0	0
Dividends distributed to preferred shares	0
Income tax expense	$100,000	$100,000

Fair_Value_of_Financial_Instru2

Fair Value of Financial Instruments (Details) (USD $)	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
Fair value and carrying values for notes and bonds payable, mortgage notes receivable and notes receivable
Notes and bonds payable	$1,403,692,000	[1]	$1,348,459,000	[1]
Mortgage notes receivable	1,900,000	[2]	125,547,000	[2]	162,191,000	97,381,000
Notes and bonds payable, Fair Value	1,438,800,000	[1]	1,380,600,000	[1]
Mortgage notes receivable, Fair Value	$1,900,000	[2]	$124,500,000	[2]
[1]	Level 3 - Fair value derived from valuation techniques in which one of more significant inputs or significant value drivers are unobservable.
[2]	Level 2 - Fair value based on quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-driven valuations in which significant inputs and significant value drivers are observable in active markets.

Selected_Quarterly_Financial_D2

Selected Quarterly Financial Data (Unaudited) (Details) (USD $)	3 Months Ended																12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Summary of quarterly financial information
Revenues from continuing operations	$95,001	[1]	$93,612	[2]	$91,671	[3]	$90,571	[4]	$88,622	[5]	$82,805	[6]	$80,552	[7]	$78,970	[8]	$370,855	$330,949	$297,682
Income from continuing operations	9,060	[1]	8,437	[2]	9,005	[3]	7,477	[4]	9,656	[5]	4,511	[6]	-27,861	[7]	602	[8]	33,979	-13,092	-892
Discontinued operations	9,013	[1]	-4,284	[2]	-2,994	[3]	-3,514	[4]	2,800	[5]	15,272	[6]	3,623	[7]	-1,620	[8]	-1,779	20,075	6,427
NET INCOME	18,073	[1]	4,153	[2]	6,011	[3]	3,963	[4]	12,456	[5]	19,783	[6]	-24,238	[7]	-1,018	[8]	32,200	6,983	5,535
Less: Net income attributable to noncontrolling interests	0	[1]	-162	[2]	-40	[3]	-111	[4]	-72	[5]	-17	[6]	33	[7]	19	[8]	-313	-37	-70
NET INCOME (LOSS) ATTRIBUTABLE TO COMMON STOCKHOLDERS	$18,073	[1]	$3,991	[2]	$5,971	[3]	$3,852	[4]	$12,384	[5]	$19,766	[6]	($24,205)	[7]	($999)	[8]	$31,887	$6,946	$5,465
Net income attributable to common stockholders per share:
Basic earnings (loss) per common share (dollars per share)	$0.19	[1]	$0.04	[2]	$0.06	[3]	$0.04	[4]	$0.13	[5]	$0.21	[6]	($0.27)	[7]	($0.01)	[8]	$0.33	$0.08	$0.07
Diluted earnings (loss) per common share (dollars per share)	$0.18	[1]	$0.04	[2]	$0.06	[3]	$0.04	[4]	$0.13	[5]	$0.21	[6]	($0.27)	[7]	($0.01)	[8]	$0.33	$0.08	$0.07
[1]	The increases in net income and amounts per share for the fourth quarter of 2014 are primarily attributable to gains on sales of real estate totaling $9.3 million, partially offset by impairment charges of $1.0 million.
[2]	The decreases in net income and amounts per share for the third quarter of 2014 are primarily attributable to impairment charges of
[3]	The increases in net income and amounts per share for the second quarter of 2014 are primarily attributable to a $1.9 million cash reimbursement received by the Company for certain operating expenses paid by the Company for years 2006 through 2013
[4]	The decreases in net income and amounts per share for the first quarter of 2014 are primarily attributable to impairment charges of $3.4 million.
[5]	The increases in net income and amounts per share for the fourth quarter of 2013 are primarily attributable to gains on sales of real estate totaling $2.7 million.
[6]	The increases in net income and amounts per share for the third quarter of 2013 are primarily attributable to gains on sales of real estate totaling $20.2 million, partially offset by impairment charges of $6.3 million.
[7]	The decreases in net income and amounts per share for the second quarter of 2013 are primarily attributable to losses of extinguishment of debt of $29.9 million, of which $0.3 million is included in discontinued operations. This amount is partially offset by gains on sales of real estate totaling $1.8 million.
[8]	The decreases in net income and amounts per share for the first quarter of 2013 are primarily attributable to impairment charges of $3.6 million.

Selected_Quarterly_Financial_D3

Selected Quarterly Financial Data - Additional information (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]
Impairment charges	$1,000,000	$4,500,000		$3,400,000		$6,300,000		$3,600,000
Cash reimbursement received by the Company for operating expenses			1,900,000
Loss on extinguishment of debt							-29,900,000			29,638,000
Loss on extinguishment of debt, discontinued operations							300,000
Gains on sale of real estate	$9,300,000				$2,700,000	$20,200,000	$1,800,000		$9,283,000	$24,718,000	$10,874,000

Schedule_II_Valuation_and_Qual1

Schedule II - Valuation and Qualifying Accounts (Details) (Accounts receivable allowance [Member], USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounts receivable allowance [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$541	$740	$583
Charged to Costs and Expenses, Additions	34	185	240
Charged to Other Accounts, Additions	0	0	0
Uncollectible Accounts Written-off	110	384	83
Balance at End of Period	$465	$541	$740

Schedule_III_Real_Estate_and_A1

Schedule III - Real Estate and Accumulated Depreciation (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
	Property
Summary of real estate properties
Number of Properties	198
Buildings, Improvements, Lease Intangibles and CIP
Gross real estate asset, Total	$3,271,536		$3,084,166	$2,830,931	$2,831,732
Accumulated depreciation	705,135		642,320	586,920	536,682
Medical office/outpatient [Member]
Summary of real estate properties
Number of Properties	175
State	AL, AZ, CA, CO, DC, FL, GA,  HI, IA, IL, IN,  KS, LA, MD, MI, MN, MO, MS, NC, NV, OH, OK, OR, SC, SD, TN, TX, VA, WA
Land
Initial Investment	155,470
Cost Capitalized Subsequent to Acquisition	2,725
Total	158,195
Buildings, Improvements, Lease Intangibles and CIP
Initial Investment	2,200,146
Cost Capitalized Subsequent to Acquisition	356,836
Total	2,556,982
Personal Property	3,507
Gross real estate asset, Total	2,718,684	[1],[2]
Accumulated depreciation	589,686	[2],[3]
Encumbrances	171,796	[4]
Medical office/outpatient [Member] | Minimum [Member]
Buildings, Improvements, Lease Intangibles and CIP
Date Acquired	1-Jan-93
Date Constructed	1-Jan-05
Medical office/outpatient [Member] | Maximum [Member]
Buildings, Improvements, Lease Intangibles and CIP
Date Acquired	31-Dec-12
Date Constructed	31-Dec-12
Inpatient [Member]
Summary of real estate properties
Number of Properties	14
State	AZ, CA, CO, IN, MO, PA, TX
Land
Initial Investment	23,236
Cost Capitalized Subsequent to Acquisition	150
Total	23,386
Buildings, Improvements, Lease Intangibles and CIP
Initial Investment	406,108
Cost Capitalized Subsequent to Acquisition	14,161
Total	420,269
Personal Property	265
Gross real estate asset, Total	443,920	[1],[2]
Accumulated depreciation	84,285	[2],[3]
Encumbrances	0	[4]
Inpatient [Member] | Minimum [Member]
Buildings, Improvements, Lease Intangibles and CIP
Date Acquired	1-Jan-94
Date Constructed	1-Jan-83
Inpatient [Member] | Maximum [Member]
Buildings, Improvements, Lease Intangibles and CIP
Date Acquired	31-Dec-12
Date Constructed	31-Dec-12
Other [Member]
Summary of real estate properties
Number of Properties	11
State	AL, IA, IN, MI TN, VA
Land
Initial Investment	1,828
Cost Capitalized Subsequent to Acquisition	73
Total	1,901
Buildings, Improvements, Lease Intangibles and CIP
Initial Investment	76,014
Cost Capitalized Subsequent to Acquisition	7,808
Total	83,822
Personal Property	679
Gross real estate asset, Total	86,402	[1],[2]
Accumulated depreciation	27,330	[2],[3]
Encumbrances	1,471	[4]
Other [Member] | Minimum [Member]
Buildings, Improvements, Lease Intangibles and CIP
Date Acquired	1-Jan-93
Date Constructed	1-Jan-06
Other [Member] | Maximum [Member]
Buildings, Improvements, Lease Intangibles and CIP
Date Acquired	31-Dec-11
Date Constructed	31-Dec-95
Real Estate [Member]
Summary of real estate properties
Number of Properties	200
Land
Initial Investment	180,534
Cost Capitalized Subsequent to Acquisition	2,948
Total	183,482
Buildings, Improvements, Lease Intangibles and CIP
Initial Investment	2,682,268
Cost Capitalized Subsequent to Acquisition	378,805
Total	3,061,073
Personal Property	4,451
Gross real estate asset, Total	3,249,006	[1],[2]
Accumulated depreciation	701,301	[2],[3]
Encumbrances	173,267	[4]
Land Held for Development [Member]
Summary of real estate properties
Number of Properties	0
Land
Initial Investment	17,054
Cost Capitalized Subsequent to Acquisition	0
Total	17,054
Buildings, Improvements, Lease Intangibles and CIP
Initial Investment	0
Cost Capitalized Subsequent to Acquisition	0
Total	0
Personal Property	0
Gross real estate asset, Total	17,054	[1],[2]
Accumulated depreciation	115	[2],[3]
Encumbrances	0	[4]
Corporate Property [Member]
Summary of real estate properties
Number of Properties	0
Land
Initial Investment	0
Cost Capitalized Subsequent to Acquisition	0
Total	0
Buildings, Improvements, Lease Intangibles and CIP
Initial Investment	0
Cost Capitalized Subsequent to Acquisition	0
Total	0
Personal Property	5,476
Gross real estate asset, Total	5,476	[1],[2]
Accumulated depreciation	3,719	[2],[3]
Encumbrances	0	[4]
Owned Property [Member]
Summary of real estate properties
Number of Properties	200
Land
Initial Investment	197,588
Cost Capitalized Subsequent to Acquisition	2,948
Total	200,536
Buildings, Improvements, Lease Intangibles and CIP
Initial Investment	2,682,268
Cost Capitalized Subsequent to Acquisition	378,805
Total	3,061,073
Personal Property	9,927
Gross real estate asset, Total	3,271,536	[1],[2]
Accumulated depreciation	705,135	[2],[3]
Encumbrances	$173,267	[4]
[1]	Total assets as of December 31, 2014 have an estimated aggregate total cost of $3.3 billion for federal income tax purposes.
[2]	Depreciation is provided for on a straight-line basis on buildings and improvements over 3.3 to 39.0 years, lease intangibles over 1.0 to 93.1 years, personal property over 1.9 to 15.8 years, and land improvements over 15.0 to 38.1 years.
[3]	Includes two assets held for sale as of December 31, 2014 of approximately $13.3 million (gross) and accumulated depreciation of $4.5 million, three asset held for sale as of December 31, 2013 of approximately $17.0 million (gross) and accumulated depreciation of $10.2 million; and one assets held for sale as of December 31, 2012 of $9.6 million (gross) and accumulated depreciation of $6.3 million.
[4]	Includes unamortized premium of $3.2 million and unaccreted discount of $2.5 million as of December 31, 2014.

Schedule_III_Real_Estate_and_A2

Schedule III - Real Estate and Accumulated Depreciation (Details 1) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Beginning Balance, Total Property					$2,831,732
Retirement/dispositions:
Ending Balance, Total Property	3,271,536		3,084,166	2,830,931	2,831,732
Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Beginning Balance, Accumulated Depreciation					536,682
Retirement/dispositions:
Ending Balance, Accumulated Depreciation	705,135		642,320	586,920	536,682
Real Estate [Member]
Additions during the period:
Total Property	166,290		314,159	104,810
Retirement/dispositions:
Total Property	-74,507		-111,656	-128,325
Ending Balance, Total Property	3,249,006	[1],[2]
Additions during the period:
Accumulated Depreciation	2,272		1,046	1,079
Retirement/dispositions:
Accumulated Depreciation	-46,276		-42,927	-45,117
Ending Balance, Accumulated Depreciation	701,301	[2],[3]
Other improvements [Member]
Additions during the period:
Total Property	55,340		58,849	55,299
Additions during the period:
Accumulated Depreciation	105,257		97,255	94,250
Corporate Property [Member]
Additions during the period:
Total Property	40,247		0	0
Retirement/dispositions:
Ending Balance, Total Property	5,476	[1],[2]
Additions during the period:
Accumulated Depreciation	1,536		0	0
Retirement/dispositions:
Ending Balance, Accumulated Depreciation	3,719	[2],[3]
Land held for development [Member]
Additions during the period:
Total Property	0		0	0
Retirement/dispositions:
Total Property	0		-8,117	0
Additions during the period:
Accumulated Depreciation	26		26	26
Retirement/dispositions:
Accumulated Depreciation	0		0	0
Construction in Progress [Member]
Additions during the period:
Total Property	0		0	5,608
Additions during the period:
Accumulated Depreciation	0		0	0
Disposal of previously consolidated VIE [Member]
Retirement/dispositions:
Total Property	0		0	-38,193
Retirement/dispositions:
Accumulated Depreciation	$0		$0	$0
[1]	Total assets as of December 31, 2014 have an estimated aggregate total cost of $3.3 billion for federal income tax purposes.
[2]	Depreciation is provided for on a straight-line basis on buildings and improvements over 3.3 to 39.0 years, lease intangibles over 1.0 to 93.1 years, personal property over 1.9 to 15.8 years, and land improvements over 15.0 to 38.1 years.
[3]	Includes two assets held for sale as of December 31, 2014 of approximately $13.3 million (gross) and accumulated depreciation of $4.5 million, three asset held for sale as of December 31, 2013 of approximately $17.0 million (gross) and accumulated depreciation of $10.2 million; and one assets held for sale as of December 31, 2012 of $9.6 million (gross) and accumulated depreciation of $6.3 million.

Schedule_III_Real_Estate_and_A3

Schedule III - Real Estate and Accumulated Depreciation (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
			property
Real Estate and Accumulated Depreciation (Textual) [Abstract]
Number of real estate assets held for sale	2	3	1
Gross value of assets held for sale	13,300,000	17,000,000	$9,600,000
Accumulated depreciation on real estate assets held for sale	4,500,000	10,200,000	6,300,000
Estimated aggregate total cost of total assets for federal income tax purposes	3,300,000,000	3,100,000,000	2,800,000,000
Mortgage notes payable [Member] | 5.000%-7.63% Mortgage Notes Payable [Member]
Real Estate and Accumulated Depreciation (Textual) [Abstract]
Unamortized premium	3,205,000	2,708,000
Unaccreted discount	2,468,000	3,596,000
Building and improvements [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation (Textual) [Abstract]
Asset estimated useful life	3 years 3 months 18 days
Building and improvements [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation (Textual) [Abstract]
Asset estimated useful life	39 years
Lease intangibles [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation (Textual) [Abstract]
Asset estimated useful life	1 year
Lease intangibles [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation (Textual) [Abstract]
Asset estimated useful life	93 years 1 month 6 days
Personal property [Member]
Real Estate and Accumulated Depreciation (Textual) [Abstract]
Asset estimated useful life		1 year 10 months 24 days
Personal property [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation (Textual) [Abstract]
Asset estimated useful life	1 year 10 months 24 days
Personal property [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation (Textual) [Abstract]
Asset estimated useful life	15 years 9 months 18 days
Land improvements [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation (Textual) [Abstract]
Asset estimated useful life	15 years
Land improvements [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation (Textual) [Abstract]
Asset estimated useful life	38 years 1 month 6 days

Schedule_IV_Mortgage_Loans_on_1

Schedule IV - Mortgage Loans on Real Estate (Details) (USD $)	12 Months Ended
	Dec. 31, 2014
Mortgage Loans on Real Estate [Line Items]
Carrying Amount	$1,900,000
Medical Office [Member] | Permanent Mortgage Loans [Member] | Nevada [Member]
Mortgage Loans on Real Estate [Line Items]
Interest Rate	6.50%
Maturity Date	30-Sep-17
Original Face Amount	1,900,000
Carrying Amount	1,900,000
Balloon	1,650,000
Principal reduction in 2015	$300,000

Schedule_IV_Mortgage_Loans_on_2

Schedule IV - Mortgage Loans on Real Estate (Details 1) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Rollforward of Mortgage loans on real estate
Balance at beginning of period	$125,547	[1]	$162,191		$97,381
Additions during period:
New or acquired mortgages	1,900		4,241		11,200
Increased funding on existing mortgages	1,244		58,731		78,297
Additions during period, total	3,144		62,972		89,497
Deductions during period:
Scheduled principal payments	0		0		-16
Principal repayments and reductions	-5,605	[2]	-2,413	[2]	-14,812	[2]
Principal reductions due to acquisitions	-81,213	[3]	-97,203	[3]	-9,859	[3]
Mortgage eliminated in consolidation	-39,973		0		0
Deductions during period, total	-126,791		-99,616		-24,687
Balance at end of period	$1,900	[1]	$125,547	[1]	$162,191
[1]	Level 2 - Fair value based on quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-driven valuations in which significant inputs and significant value drivers are observable in active markets.
[2]	In May 2014, the Company acquired a medical office building in Oklahoma for $85.4 million, including the elimination of the construction mortgage note receivable totaling $81.2 million and cash consideration of approximately $4.2 million.
[3]	In March 2014, the Company acquired a medical office building in Iowa in satisfaction of a $40.0 million mortgage note receivable that matured on January 10, 2014. The cash flows from the operations of the property were sufficient to pay the Company interest from the maturity date through the date of the transfer of ownership to the Company at the 7.7% fixed interest rate plus an additional 3% of interest for the default interest rate. The Company did not recognize any of the $1.5 million exit fee receivable that was due upon maturity of the mortgage note receivable.

Schedule_IV_Mortgage_Loans_on_3

Schedule IV - Mortgage Loans on Real Estate (Details Textual) (USD $)	12 Months Ended					1 Months Ended	0 Months Ended	1 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012	Sep. 30, 2013	Jan. 10, 2014	31-May-14	31-May-12	Mar. 31, 2014
Mortgage Loans on Real Estate [Line Items]
Unscheduled principal reductions on mortgage notes	$5,600,000		$2,400,000		$14,800,000
Construction mortgage note receivable prepayment	81,200,000		97,200,000
Aggregate total cost of mortgages for federal income tax purposes	1,900,000
Texas [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage note financing									9,900,000
Orthopedic Surgical Facility [Member] | Missouri [Member]
Mortgage Loans on Real Estate [Line Items]
Facility acquired						102,600,000
Construction mortgage note receivable prepayment						97,200,000
Other Mortgage Loans [Member] | Other Property [Member] | Iowa [Member]
Mortgage Loans on Real Estate [Line Items]
Face Amount	40,000,000									40,000,000
Interest Rate	7.70%						7.70%
Incremental Interest Rate for Default	3.00%
Mortgage Loan on Real Estate Exit Fee	1,500,000
Real Estate Acquisitions [Member]
Mortgage Loans on Real Estate [Line Items]
Facility acquired	206,500,000		314,100,000
Construction mortgage note receivable prepayment			97,200,000
Purchase Price	168,500,000		315,200,000
Payments to Acquire Businesses, Gross	69,100,000	[1]	178,400,000	[1]
Real Estate Acquisitions [Member] | Missouri [Member]
Mortgage Loans on Real Estate [Line Items]
Facility acquired			102,600,000
Construction mortgage note receivable prepayment			97,200,000
Purchase Price			102,600,000
Payments to Acquire Businesses, Gross			5,400,000	[1]
Real Estate Acquisitions [Member] | Texas [Member]
Mortgage Loans on Real Estate [Line Items]
Facility acquired	8,800,000
Purchase Price	8,700,000
Payments to Acquire Businesses, Gross	8,700,000	[1]
Real Estate Acquisitions [Member] | Iowa [Member]
Mortgage Loans on Real Estate [Line Items]
Facility acquired	40,200,000
Purchase Price	0
Real Estate Acquisitions [Member] | Construction Loans [Member] | OKLAHOMA
Mortgage Loans on Real Estate [Line Items]
Construction mortgage note receivable prepayment	1,200,000
Purchase Price								85,400,000
Face Amount								81,200,000
Payments to Acquire Businesses, Gross								$4,200,000
[1]	Cash consideration excludes non-real estate assets acquired and liabilities assumed in the acquisitions.