Dupont Fabros Technology 10-Q 24 Oct 13 2013 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information Document	9 Months Ended
	Sep. 30, 2013	Oct. 18, 2013
Entity Information [Line Items]
Document Period End Date	30-Sep-13
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q3
Amendment Flag	FALSE
Entity Registrant Name	DUPONT FABROS TECHNOLOGY, INC.
Entity Central Index Key	1407739
Current Fiscal Year End Date	-19
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Entity Common Stock, Shares Outstanding		64,725,907
DuPont Fabros Technology, L.P. [Member]
Entity Information [Line Items]
Document Period End Date	30-Sep-13
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q3
Amendment Flag	FALSE
Entity Registrant Name	DUPONT FABROS TECHNOLOGY, L.P.
Entity Central Index Key	1418175
Current Fiscal Year End Date	-19
Entity Filer Category	Non-accelerated Filer
Document Type	10-Q

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Sep. 30, 2013		Dec. 31, 2012
In Thousands, unless otherwise specified
ASSETS
Land	$75,956		$73,197
Buildings and improvements	2,420,123		2,315,499
Income producing property	2,496,079		2,388,696
Less: accumulated depreciation	-391,404		-325,740
Net income producing property	2,104,675		2,062,956
Construction in progress and land held for development	197,400	[1]	218,934
Net real estate	2,302,075		2,281,890
Cash and cash equivalents	198,196		23,578
Rents and other receivables	7,965		3,840
Deferred rent	148,440		144,829
Lease contracts above market value, net	9,429		10,255
Deferred costs, net	43,308		35,670
Prepaid expenses and other assets	42,137		30,797
Total assets	2,751,550		2,530,859
Liabilities:
Line of credit	0		18,000
Mortgage notes payable	115,000		139,600
Unsecured Term Loan	120,000		0
Unsecured notes payable	731,889		550,000
Accounts payable and accrued liabilities	26,677		22,280
Construction costs payable	22,243		6,334
Accrued interest payable	4,651		2,601
Dividend and distribution payable	25,902		22,177
Lease contracts below market value, net	11,403		14,022
Prepaid rents and other liabilities	51,060		35,524
Total liabilities	1,108,825		810,538
Redeemable noncontrolling interests - operating partnership	409,280		453,889
Commitments and contingencies	0		0
Stockholders’ equity:
Common stock, $.001 par value, 250,000,000 shares authorized, 64,645,117 shares issued and outstanding at March 31, 2013 and 63,340,929 shares issued and outstanding at December 31, 2012	65		63
Additional paid in capital	892,358		915,119
Retained earnings (accumulated deficit)	-10,228		0
Total stockholders’ equity	1,233,445		1,266,432
Total liabilities and stockholders’ equity	2,751,550		2,530,859
Series A cumulative redeemable perpetual preferred stock [Member]
Stockholders’ equity:
Preferred stock, $.001 par value, 50,000,000 shares authorized	185,000		185,000
Series B cumulative redeemable perpetual preferred stock [Member]
Stockholders’ equity:
Preferred stock, $.001 par value, 50,000,000 shares authorized	166,250		166,250
DuPont Fabros Technology, L.P. [Member]
ASSETS
Land	75,956		73,197
Buildings and improvements	2,420,123		2,315,499
Income producing property	2,496,079		2,388,696
Less: accumulated depreciation	-391,404		-325,740
Net income producing property	2,104,675		2,062,956
Construction in progress and land held for development	197,400		218,934
Net real estate	2,302,075		2,281,890
Cash and cash equivalents	193,900		19,282
Rents and other receivables	7,965		3,840
Deferred rent	148,440		144,829
Lease contracts above market value, net	9,429		10,255
Deferred costs, net	43,308		35,670
Prepaid expenses and other assets	42,137		30,797
Total assets	2,747,254		2,526,563
Liabilities:
Line of credit	0		18,000
Mortgage notes payable	115,000		139,600
Unsecured Term Loan	120,000		0
Unsecured notes payable	731,889		550,000
Accounts payable and accrued liabilities	26,677		22,280
Construction costs payable	22,243		6,334
Accrued interest payable	4,651		2,601
Dividend and distribution payable	25,902		22,177
Lease contracts below market value, net	11,403		14,022
Prepaid rents and other liabilities	51,060		35,524
Total liabilities	1,108,825		810,538
Redeemable noncontrolling interests - operating partnership	409,280		453,889
Redeemable partnership units	409,280		453,889
Commitments and contingencies	0		0
Stockholders’ equity:
Total liabilities and stockholders’ equity	2,747,254		2,526,563
Partners’ capital:
General partner’s capital, common units, 662,373 issued and outstanding at March 31, 2013 and December 31, 2012	8,985		9,525
Total partners’ capital	1,229,149		1,262,136
DuPont Fabros Technology, L.P. [Member] | Series A cumulative redeemable perpetual preferred units [Member]
Partners’ capital:
Limited partners' capital	185,000		185,000
DuPont Fabros Technology, L.P. [Member] | Series B cumulative redeemable perpetual preferred units [Member]
Partners’ capital:
Limited partners' capital	166,250		166,250
DuPont Fabros Technology, L.P. [Member] | Limited partners' common units [Member]
Partners’ capital:
Limited partners' capital	868,914		901,361
DuPont Fabros Technology, L.P. [Member] | Series A cumulative redeemable perpetual preferred stock [Member]
Partners’ capital:
Limited partners' capital	185,000		185,000
DuPont Fabros Technology, L.P. [Member] | Series B cumulative redeemable perpetual preferred stock [Member]
Partners’ capital:
Limited partners' capital	$166,250		$166,250
[1]	(1)Properties located in Ashburn, VA (ACC7 and ACC8); Piscataway, NJ (NJ1 Phase II), Elk Grove Village, IL (CH2) and Santa Clara, CA (SC1 Phase II and SC2).

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2013	Dec. 31, 2012
Preferred stock, par value	$0.00	$0.00
Preferred stock, shares authorized	50,000,000	50,000,000
Common stock, par value	$0.00	$0.00
Common stock, shares authorized	250,000,000	250,000,000
Common stock, shares issued	64,722,005	63,340,929
Common stock, shares outstanding	64,722,005	63,340,929
General Partners' Capital Account, Units Issued	662,373	662,373
General partners' capital, units outstanding	662,373	662,373
Series A cumulative redeemable perpetual preferred units [Member]
Limited partners' capital, common units issued	7,400,000	7,400,000
Limited partners' capital, common units outstanding	7,400,000	7,400,000
Series B cumulative redeemable perpetual preferred units [Member]
Limited partners' capital, common units issued	6,650,000	6,650,000
Limited partners' capital, common units outstanding	6,650,000	6,650,000
Limited partners' common units [Member]
Limited partners' capital, common units issued	64,059,632	62,678,556
Limited partners' capital, common units outstanding	64,059,632	62,678,556
Series A cumulative redeemable perpetual preferred stock [Member]
Preferred stock, shares issued	7,400,000	7,400,000
Preferred stock, shares outstanding	7,400,000	7,400,000
Series B cumulative redeemable perpetual preferred stock [Member]
Preferred stock, shares issued	6,650,000	6,650,000
Preferred stock, shares outstanding	6,650,000	6,650,000

Consolidated_Statements_of_Ope

Consolidated Statements of Operations (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenues:
Base rent	$63,281	$56,641	$185,474	$165,584
Recoveries from tenants	31,687	27,759	87,073	77,573
Other revenues	1,374	1,046	3,118	3,329
Total revenues	96,342	85,446	275,665	246,486
Expenses:
Property operating costs	27,119	24,524	75,398	70,360
Real estate taxes and insurance	3,630	4,631	10,944	9,215
Depreciation and amortization	23,538	22,531	69,773	66,885
General and administrative	3,664	3,973	12,546	13,714
Other expenses	874	734	2,231	2,146
Total expenses	58,825	56,393	170,892	162,320
Operating income	37,517	29,053	104,773	84,166
Interest income	32	33	85	112
Interest:
Expense incurred	-12,048	-11,934	-37,490	-36,471
Amortization of deferred financing costs	-849	-874	-2,542	-2,677
Loss on early extinguishment of debt	-30,610	0	-32,310	0
Net (loss) income	-5,958	16,278	32,516	45,130
Net loss (income) attributable to redeemable noncontrolling interests – operating partnership	2,541	-2,181	-2,397	-5,757
Net (loss) income attributable to controlling interests	-3,417	14,097	30,119	39,373
Preferred stock dividends	-6,811	-6,811	-20,433	-20,241
Net (loss) income attributable to common shares	-10,228	7,286	9,686	19,132
Earnings per share – basic:
Net income attributable to common shares	($0.16)	$0.11	$0.15	$0.30
Weighted average common shares outstanding	64,432,010	62,994,500	64,631,772	62,820,979
Earnings per share – diluted:
Net income attributable to common shares	($0.16)	$0.11	$0.15	$0.30
Weighted average common shares outstanding	64,432,010	63,881,663	65,485,430	63,727,131
Dividends declared per common share	$0.25	$0.15	$0.70	$0.42
Earnings per unit – diluted:
Weighted average common units outstanding	80,321,840	81,826,688	80,626,882	81,724,511
DuPont Fabros Technology, L.P. [Member]
Revenues:
Base rent	63,281	56,641	185,474	165,584
Recoveries from tenants	31,687	27,759	87,073	77,573
Other revenues	1,374	1,046	3,118	3,329
Total revenues	96,342	85,446	275,665	246,486
Expenses:
Property operating costs	27,119	24,524	75,398	70,360
Real estate taxes and insurance	3,630	4,631	10,944	9,215
Depreciation and amortization	23,538	22,531	69,773	66,885
General and administrative	3,664	3,973	12,546	13,714
Other expenses	874	734	2,231	2,146
Total expenses	58,825	56,393	170,892	162,320
Operating income	37,517	29,053	104,773	84,166
Interest income	32	33	85	112
Interest:
Expense incurred	-12,048	-11,934	-37,490	-36,471
Amortization of deferred financing costs	-849	-874	-2,542	-2,677
Loss on early extinguishment of debt	-30,610	0	-32,310	0
Net (loss) income	-5,958	16,278	32,516	45,130
Preferred stock dividends	-6,811	-6,811	-20,433	-20,241
Net income attributable to common units	($12,769)	$9,467	$12,083	$24,889
Earnings per unit – basic:
Net income attributable to common units	($0.16)	$0.11	$0.15	$0.30
Weighted average common units outstanding	80,321,840	81,826,688	80,626,882	81,724,511
Earnings per unit – diluted:
Net income attributable to common units	($0.16)	$0.11	$0.15	$0.30
Weighted average common units outstanding	80,321,840	82,713,851	81,480,540	82,630,663
Distributions declared per unit	$0.25	$0.15	$0.70	$0.42

Consolidated_Statements_of_Sto

Consolidated Statements of Stockholders' Equity (USD $)	Total	PreferredStock/Units [Member]	Common Class A [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]
In Thousands, except Share data
Balance at Dec. 31, 2012	$1,266,432	$351,250	$63	$915,119	$0
Balance, shares at Dec. 31, 2012	63,340,929
Net income attributable to controlling interests	30,119				30,119
Dividends declared on common stock	-45,284			-25,370	-19,914
Dividends earned on preferred stock	-20,433				-20,433
Redemption of operating partnership units	70,200		3	70,197
Redemption of operating partnership units, shares	2,904,769
Common stock repurchases	-37,792		-1	-37,791
Common stock repurchase, shares	1,632,673
Issuance of stock awards	320		0	320
Issuance of stock awards, shares	152,931
Stock Issued During Period, Value, Stock Options Exercised	61		0	61
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	12,000
Retirement and forfeiture of stock awards	-1,138		0	-1,138
Retirement and forfeiture of stock awards, shares	-55,951
Amortization of deferred compensation costs	5,286			5,286
Adjustments to redeemable noncontrolling interests – operating partnership	-34,326			-34,326
Balance at Sep. 30, 2013	$1,233,445	$351,250	$65	$892,358	($10,228)
Balance, shares at Sep. 30, 2013	64,722,005

Consolidated_Statement_of_Part

Consolidated Statement of Partners' Capital (USD $)	Total	DuPont Fabros Technology, L.P. [Member]	DuPont Fabros Technology, L.P. [Member]	DuPont Fabros Technology, L.P. [Member]	DuPont Fabros Technology, L.P. [Member]
In Thousands, except Share data			Limited Partners' Capital - Preferred [Member]	Limited Partners' Capital - Common [Member]	General Partner's Capital [Member]
Balance at Dec. 31, 2012		$1,262,136	$351,250	$901,361	$9,525
Balance, units at Dec. 31, 2012				62,678,556	662,373
Net income	32,516	32,516		32,183	333
Common unit distributions		-56,416		-55,952	-464
Preferred unit distributions		-20,433		-20,224	-209
Redemption of operating partnership units, shares	2,904,769	2,904,769		2,904,769
Redemption of operating partnership units	70,200	70,200		70,200
Retirement of OP units for common stock repurchase, units				-1,632,673
Retirement of OP units for common stock repurchases		-37,792		-37,792
Issuance of OP units for stock awards, units				152,931
Issuance of OP units for stock awards		320		320
Issuance of OP units due to option exercises				12,000
Partners' Capital Account, Option Exercise		61		61
Retirement and forfeiture of OP units, units				-55,951
Retirement and forfeiture of OP units		-1,138		-1,138
Amortization of deferred compensation costs	5,286	5,286		5,286
Adjustmenst to redeemable partnership units		-25,591		-25,391	-200
Balance at Sep. 30, 2013		1,229,149	351,250	868,914	8,985
Balance, units at Sep. 30, 2013				64,059,632	662,373
Balance at Jun. 30, 2013
Net income	-5,958	-5,958
Balance at Sep. 30, 2013		$1,229,149	$351,250

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Cash flow from operating activities
Net income	$32,516	$45,130
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	69,773	66,885
Straight line rent	-5,323	-16,824
Amortization of deferred financing costs	-2,542	-2,677
Write off of Deferred Debt Issuance Cost	32,310	0
Amortization of lease contracts above and below market value	-1,793	-2,595
Compensation paid with Company common shares	5,076	5,333
Changes in operating assets and liabilities
Rents and other receivables	-2,376	-1,668
Deferred costs	-2,132	-898
Prepaid expenses and other assets	-10,951	-6,128
Accounts payable and accrued liabilities	4,593	739
Accrued interest payable	2,050	11,742
Prepaid rents and other liabilities	14,365	-1,653
Net cash provided by operating activities	140,650	102,740
Cash flow from investing activities
Investments in real estate – development	-50,164	-82,754
Payments to Acquire Land	-14,186	0
Interest capitalized for real estate under development	-1,522	-2,654
Improvements to real estate	-5,035	-3,333
Additions to non-real estate property	-24	-55
Net cash used in investing activities	-70,931	-88,796
Line of credit:
Proceeds	102,000	15,000
Repayments	-120,000	-35,000
Mortgage notes payable:
Proceeds from Issuance of Secured Debt	115,000	0
Repayments of Notes Payable	-138,300	0
Repayments	-1,300	-3,900
Proceeds from Issuance of Unsecured Debt	120,000	0
Proceeds from Unsecured Notes Payable	600,000	0
Repayments of Unsecured Debt	-418,111	0
Payments of financing costs	-18,073	-2,084
Payments of Debt Extinguishment Costs	-25,462	0
Issuance of preferred stock, net of offering costs	0	62,685
Exercises of stock options	61	868
Payments for Repurchase of Common Stock	-37,792	0
Dividends and distributions:
Common shares	-41,772	-24,616
Preferred shares	-20,434	-19,195
Redeemable noncontrolling interests – operating partnership	-10,918	-7,388
Net cash provided by financing activities	104,899	-13,630
Net increase (decrease) in cash and cash equivalents	174,618	314
Cash and cash equivalents, beginning	23,578	14,402
Cash and cash equivalents, ending	198,196	14,716
Supplemental information:
Cash paid for interest	36,961	27,384
Deferred financing costs capitalized for real estate under development	95	161
Construction costs payable capitalized for real estate under development	22,243	10,549
Redemption of operating partnership units	70,200	5,700
Adjustments to redeemable noncontrolling interests – operating partnership	34,326	21,643
DuPont Fabros Technology, L.P. [Member]
Cash flow from operating activities
Net income	32,516	45,130
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	69,773	66,885
Straight line rent	-5,323	-16,824
Amortization of deferred financing costs	-2,542	-2,677
Write off of Deferred Debt Issuance Cost	32,310	0
Amortization of lease contracts above and below market value	-1,793	-2,595
Compensation paid with Company common shares	5,076	5,333
Changes in operating assets and liabilities
Rents and other receivables	-2,376	-1,668
Deferred costs	-2,132	-898
Prepaid expenses and other assets	-10,951	-6,128
Accounts payable and accrued liabilities	4,593	739
Accrued interest payable	2,050	11,742
Prepaid rents and other liabilities	14,365	-1,653
Net cash provided by operating activities	140,650	102,740
Cash flow from investing activities
Investments in real estate – development	-50,164	-82,754
Payments to Acquire Land	-14,186	0
Interest capitalized for real estate under development	-1,522	-2,654
Improvements to real estate	-5,035	-3,333
Additions to non-real estate property	-24	-55
Net cash used in investing activities	-70,931	-88,796
Line of credit:
Proceeds	102,000	15,000
Repayments	-120,000	-35,000
Mortgage notes payable:
Proceeds from Issuance of Secured Debt	115,000	0
Repayments of Notes Payable	-138,300	0
Repayments	-1,300	-3,900
Proceeds from Issuance of Unsecured Debt	120,000	0
Proceeds from Unsecured Notes Payable	600,000	0
Repayments of Unsecured Debt	-418,111	0
Payments of financing costs	-18,073	-2,084
Payments of Debt Extinguishment Costs	-25,462	0
Issuance of preferred stock, net of offering costs	0	62,694
Exercises of stock options	61	868
Payments for Repurchase of Common Stock	-37,792	0
Proceeds from Related Party Debt	0	4,000
Distributions	-73,124	-51,199
Dividends and distributions:
Net cash provided by financing activities	104,899	-9,621
Net increase (decrease) in cash and cash equivalents	174,618	4,323
Cash and cash equivalents, beginning	19,282	10,097
Cash and cash equivalents, ending	193,900	14,420
Supplemental information:
Cash paid for interest	36,961	27,384
Deferred financing costs capitalized for real estate under development	95	161
Construction costs payable capitalized for real estate under development	22,243	10,549
Redemption of operating partnership units	70,200	5,700
Adjustments to redeemable noncontrolling interests – operating partnership	($25,591)	($19,474)

1_Description_of_Business

1. Description of Business	9 Months Ended
	Sep. 30, 2013
Description of Business [Abstract]
Nature of Operations [Text Block]	Description of Business
	DuPont Fabros Technology, Inc. (the “REIT” or “DFT”), through its controlling interest in DuPont Fabros Technology, L.P. (the “Operating Partnership” or “OP” and collectively with DFT and their operating subsidiaries, the “Company”), is a fully integrated, self-administered and self-managed company that owns, acquires, develops and operates wholesale data centers. DFT is a real estate investment trust, or REIT, for federal income tax purposes and is the sole general partner of the Operating Partnership, and as of September 30, 2013, owned 80.3% of the common economic interest in the Operating Partnership, of which 1.0% is held as general partnership units. As of September 30, 2013, the Company holds a fee simple interest in the following properties:
	•	ten operating data centers – referred to as ACC2, ACC3, ACC4, ACC5, ACC6, VA3, VA4, CH1, NJ1 Phase I and SC1 Phase I;
	•	two data centers currently under development - ACC7 Phase I and SC1 Phase IIA
	•	data center projects available for future development – NJ1 Phase II, SC1 Phase IIB and ACC7 Phases II-IV
	•	land that may be used to develop additional data centers – referred to as ACC8, CH2 and SC2.

2_Significant_Accounting_Polic

2. Significant Accounting Policies	9 Months Ended
	Sep. 30, 2013
Accounting Policies [Abstract]
Significant Accounting Policies [Text Block]	Significant Accounting Policies
	Basis of Presentation
	This report combines the quarterly reports on Form 10-Q for the quarter ended September 30, 2013 of DFT and the Operating Partnership. DFT is a real estate investment trust and the general partner of the Operating Partnership. The Operating Partnership’s capital includes general and limited common operating partnership units, or “OP units.” As the sole general partner of the Operating Partnership, DFT has exclusive control of the Operating Partnership’s day-to-day management.
	The Company believes combining the quarterly reports on Form 10-Q of DFT and the Operating Partnership into this single report provides the following benefits:
	•	enhances investors’ understanding of DFT and the Operating Partnership by enabling investors to view the business as a whole in the same manner as management views and operates the business;
	•	eliminates duplicative disclosure and provides a more streamlined and readable presentation since a substantial portion of the disclosure in this report applies to both DFT and the Operating Partnership; and
	•	creates time and cost efficiencies through the preparation of one combined report instead of two separate reports.
	Management operates DFT and the Operating Partnership as one business. The management of DFT consists of the same employees as the management of the Operating Partnership.
	The Company believes it is important for investors to understand the few differences between DFT and the Operating Partnership in the context of how DFT and the Operating Partnership operate as a consolidated company. DFT is a REIT, whose only material asset is its ownership of OP units of the Operating Partnership. As a result, DFT does not conduct business itself, other than acting as the sole general partner of the Operating Partnership, issuing public equity from time to time and guaranteeing unsecured debt of the Operating Partnership. DFT has not issued any indebtedness, but has guaranteed all of the unsecured debt of the Operating Partnership. The Operating Partnership holds all the real estate assets of the Company. Except for net proceeds from public equity issuances by DFT, which are contributed to the Operating Partnership in exchange for OP units or preferred units, the Operating Partnership generates all remaining capital required by the Company’s business. These sources include the Operating Partnership’s operations, its direct or indirect incurrence of indebtedness, and the issuance of partnership units.
	As general partner with control of the Operating Partnership, DFT consolidates the Operating Partnership for financial reporting purposes. The presentation of stockholders’ equity and partners’ capital are the main areas of difference between the consolidated financial statements of DFT and those of the Operating Partnership. The Operating Partnership’s capital includes preferred units and general and limited common units that are owned by DFT and the other partners. DFT’s stockholders’ equity includes preferred stock, common stock, additional paid in capital and retained earnings (accumulated deficit). The common limited partnership interests held by the limited partners (other than DFT) in the Operating Partnership are presented as “redeemable partnership units” in the Operating Partnership’s consolidated financial statements and as “redeemable noncontrolling interests-operating partnership” in DFT’s consolidated financial statements. The only difference between the assets and liabilities of DFT and the Operating Partnership as of September 30, 2013 is a $4.3 million bank account held by DFT that is not part of the Operating Partnership. Net income is the same for DFT and the Operating Partnership.
	The accompanying unaudited consolidated financial statements have been prepared by management in accordance with U.S. generally accepted accounting principles, or GAAP, for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, these consolidated financial statements do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. All significant intercompany accounts and transactions have been eliminated in the consolidated financial statements. The results of operations for the three and nine months ended September 30, 2013 are not necessarily indicative of the results that may be expected for the full year. These consolidated financial statements should be read in conjunction with Management’s Discussion and Analysis of Financial Condition and Results of Operations contained elsewhere in this Form 10-Q and the audited financial statements and accompanying notes for the year ended December 31, 2012 contained in the Company’s Form 10-K, which contains a complete listing of the Company’s significant accounting policies.
	The Company has one reportable segment consisting of investments in data centers located in the United States. All of the Company's properties generate similar types of revenues and expenses related to tenant rent and reimbursements and operating expenses. The delivery of the Company's products is consistent across all properties and although services are provided to a range of customers, the types of services provided to them are limited to a few core principles. As such, the properties in the Company's portfolio have similar economic characteristics and the nature of the products and services provided to the Company's customers and the method to distribute such services are consistent throughout the portfolio.
	Use of Estimates
	The preparation of financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosures of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenue and expenses during the reporting period. Actual results could differ from those estimates.
	Property
	Depreciation on buildings is generally provided on a straight-line basis over 40 years from the date the buildings were placed in service. Building components are depreciated over the life of the respective improvement ranging from 10 to 40 years from the date the components were placed in service. Personal property is depreciated over three years to seven years. Depreciation expense was $22.2 million and $21.3 million for the three months ended September 30, 2013 and 2012, respectively, and $66.4 million and $63.3 million for the nine months ended September 30, 2013 and 2012, respectively. Included in these amounts is amortization expense related to tenant origination costs, which was $0.8 million for each of the three months ended September 30, 2013 and 2012, respectively, and $2.4 million for each of the nine months ended September 30, 2013 and 2012, respectively. Repairs and maintenance costs are expensed as incurred.
	The Company records impairment losses on long-lived assets used in operations or in development when events or changes in circumstances indicate that the assets might be impaired, and the estimated undiscounted cash flows to be generated by those assets are less than the carrying amounts. If circumstances indicating impairment of a long-lived asset are present, the Company would determine the fair value of that asset, and an impairment loss would be recognized in an amount equal to the excess of the carrying amount of the impaired asset over its fair value. Management assesses the recoverability of the carrying value of its assets on a property-by-property basis. No impairment losses were recorded during the nine months ended September 30, 2013 and 2012.
	Deferred Costs
	Deferred costs, net on the Company’s consolidated balance sheets include both financing and leasing costs.
	Financing costs, which represent fees and other costs incurred in obtaining debt, are amortized using the effective-interest rate method or a method that approximates the effective-interest method, over the term of the loan and are included in amortization of deferred financing costs. In March 2013, the Company paid off the $138.3 million balance of the ACC5 Term Loan that resulted in a write-off of $1.7 million of unamortized deferred financing costs. In September 2013, the Company issued $600 million of Unsecured Notes due 2021 (see Note 4) and incurred financing costs of $13.4 million. Also, in September 2013, the Company paid off $418.1 million of the tendered Unsecured Notes Due 2017 (See Note 4) that resulted in a write off of $5.1 million of unamortized deferred financing costs. Balances, net of accumulated amortization, at September 30, 2013 and December 31, 2012 are as follows (in thousands):
		September 30,				December 31,
		2013				2012
	Financing costs	$	25,988			$	23,082
	Accumulated amortization	(4,849		)		(10,531		)
	Financing costs, net	$	21,139			$	12,551
	Leasing costs, which are either external fees and costs incurred in the successful negotiations of leases, internal costs expended in the successful negotiations of leases or the estimated leasing commissions resulting from the allocation of the purchase price of ACC2, VA3, VA4 and ACC4, are deferred and amortized over the terms of the related leases on a straight-line basis. If an applicable lease terminates prior to the expiration of its initial term, the carrying amount of the costs are written off to amortization expense. The Company incurred leasing costs of $1.9 million and $0.1 million for the three months ended September 30, 2013 and 2012, respectively, and $2.1 million and $0.9 million for the nine months ended September 30, 2013 and 2012, respectively. Amortization of deferred leasing costs totaled $1.2 million and $1.1 million for the three months ended September 30, 2013 and 2012, respectively, and $3.1 million and $3.3 million for the nine months ended September 30, 2013 and 2012, respectively. Balances, net of accumulated amortization, at September 30, 2013 and December 31, 2012 are as follows (in thousands):
		September 30,				December 31,
		2013				2012
	Leasing costs	$	48,362			$	46,719
	Accumulated amortization	(26,193		)		(23,600		)
	Leasing costs, net	$	22,169			$	23,119
	Inventory
	The Company maintains fuel inventory for its generators, which is recorded at the lower of cost (on a first-in, first-out basis) or market. As of September 30, 2013 and December 31, 2012, the fuel inventory was $3.9 million and $3.0 million, respectively, and is included in prepaid expenses and other assets in the accompanying consolidated balance sheets.
	Rental Income
	The Company, as a lessor, has retained substantially all the risks and benefits of ownership and accounts for its leases as operating leases. For lease agreements that provide for scheduled fixed and determinable rent increases, rental income is recognized on a straight-line basis over the non-cancellable term of the leases, which commences when control of the space and critical power have been provided to the tenant. If the lease contains an early termination clause with a penalty payment, the Company determines the lease termination date by evaluating whether the penalty reasonably assures that the lease will not be terminated early. Lease inducements, which include free rent or cash payments to tenants, are amortized as a reduction of rental income over the non-cancellable lease term. Straight-line rents receivable are included in deferred rent on the consolidated balance sheets. Lease intangible assets and liabilities that have resulted from above-market and below-market leases that were acquired are amortized on a straight-line basis as decreases and increases, respectively, to rental revenue over the remaining non-cancellable term of the underlying leases. If a lease terminates prior to the expiration of its initial term, the unamortized portion of lease intangibles associated with that lease will be written off to rental revenue. Balances, net of accumulated amortization, at September 30, 2013 and December 31, 2012 are as follows (in thousands):
		September 30,				December 31,
		2013				2012
	Lease contracts above market value	$	23,100			$	23,100
	Accumulated amortization	(13,671		)		(12,845		)
	Lease contracts above market value, net	$	9,429			$	10,255
	Lease contracts below market value	$	39,375			$	39,375
	Accumulated amortization	(27,972		)		(25,353		)
	Lease contracts below market value, net	$	11,403			$	14,022
	The Company’s policy is to record a reserve for losses on accounts receivable equal to the estimated uncollectible
	accounts. The estimate is based on management’s historical experience and a review of the current status of the Company’s
	receivables. As of September 30, 2013 and December 31, 2012, the Company had reserves against rents and other receivables of $1.4 million and $0.9 million, respectively. The Company also establishes an appropriate allowance for doubtful accounts for receivables arising from the straight-lining of rents. These receivables arise from revenue recognized in excess of amounts currently due under the lease and are recorded as deferred rent in the accompanying balance sheets. As of September 30, 2013 and December 31, 2012, the Company had reserves against deferred rent of $2.1 million.
	The reserves described above were set up for one tenant that restructured its lease obligations with the Company. Under this restructuring, this tenant's outstanding accounts receivable and deferred rent receivable related to the returned space was converted into a note receivable, the terms of which require the payment of principal and interest through December 31, 2016. Principal payments on the note are calculated on a ten-year amortization schedule with a final principal payment of the remaining note balance due on December 31, 2016. Additionally, under this restructuring this tenant has the right to defer up to two-thirds of base rent due through July 2014 at NJ1 in Piscataway, New Jersey. Any base rent deferred is added to the note. The note balance on the accompanying balance sheet as of September 30, 2013 was $5.5 million.
	Tenant leases generally contain provisions under which the tenants reimburse the Company for a portion of operating expenses and real estate taxes incurred by the property. Recoveries from tenants are included in revenue in the consolidated statements of operations in the period the applicable expenditures are incurred. Recoveries from tenants also include the property management fees that the Company earns from its tenants.
	Other Revenue
	Other revenue primarily consists of services provided to tenants on a non-recurring basis. This includes projects such as the purchase and installation of circuits, racks, breakers and other tenant requested items. Revenue is recognized on a completed contract basis. Costs of providing these services are included in other expenses in the accompanying consolidated statements of operations.
	Redeemable Noncontrolling Interests – Operating Partnership / Redeemable Partnership Units
	Redeemable noncontrolling interests – operating partnership, as presented on DFT’s consolidated balance sheets, represent the limited partnership interests in the Operating Partnership (“OP units”) held by individuals and entities other than DFT. These interests are also presented on the Operating Partnership’s consolidated balance sheets, referred to as “redeemable partnership units.” Accordingly, the following discussion related to redeemable noncontrolling interests – operating partnership of the REIT refers equally to redeemable partnership units of the Operating Partnership.
	Redeemable noncontrolling interests – operating partnership, which require cash payment, or allow settlement in shares, but with the ability to deliver the shares outside of the control of DFT, are reported outside of the permanent equity section of the consolidated balance sheets of DFT and the Operating Partnership. Redeemable noncontrolling interests – operating partnership are adjusted for income, losses and distributions allocated to OP units not held by DFT (normal noncontrolling interest accounting amount). Adjustments to redeemable noncontrolling interests – operating partnership are recorded to reflect increases or decreases in the ownership of the Operating Partnership by holders of OP units, including the redemptions of OP units for cash or in exchange for shares of DFT’s common stock. If such adjustments result in redeemable noncontrolling interests – operating partnership being recorded at less than the redemption value of the OP units, redeemable noncontrolling interests – operating partnership are further adjusted to their redemption value (see Note 6). Redeemable noncontrolling interests – operating partnership are recorded at the greater of the normal noncontrolling interest accounting amount or redemption value. The following is a summary of activity for redeemable noncontrolling interests – operating partnership for the nine months ended September 30, 2013 (dollars in thousands):
		OP Units
		Number			Amount
	Balance at December 31, 2012	18,786,806			$	453,889
	Net income attributable to redeemable noncontrolling interests – operating partnership	—			2,397
	Distributions declared	—			(11,132		)
	Redemption of operating partnership units	(2,904,769	)		(70,200		)
	Adjustments to redeemable noncontrolling interests – operating partnership	—			34,326
	Balance at September 30, 2013	15,882,037			$	409,280
	The following is a summary of activity for redeemable partnership units for the nine months ended September 30, 2013 (dollars in thousands):
		OP Units
		Number			Amount
Balance at December 31, 2012	18,786,806			$	453,889
Redemption of operating partnership units	(2,904,769	)		(70,200		)
Adjustments to redeemable partnership units	—			25,591
Balance at September 30, 2013	15,882,037			$	409,280
Net (loss) income is allocated to controlling interests and redeemable noncontrolling interests – operating partnership in accordance with the limited partnership agreement of the Operating Partnership. The following is a summary of net (loss) income attributable to controlling interests and transfers to redeemable noncontrolling interests – operating partnership for the three and nine months ended September 30, 2013 and 2012 (dollars in thousands):
	Three months ended September 30,							Nine months ended September 30,
	2013				2012			2013		2012
Net (loss) income attributable to controlling interests	$	(3,417	)		$	14,097		$	30,119	$	39,373
Transfers from noncontrolling interests:
Net change in the Company’s common stock and additional paid in capital due to the redemption of OP units and other adjustments to redeemable noncontrolling interests – operating partnership	(31,915		)		61,690			35,874		(15,943		)
	$	(35,332	)		$	75,787		$	65,993	$	23,430
Earnings (Loss) Per Share of the REIT
Basic earnings (loss) per share is calculated by dividing the net income (loss) attributable to common shares for the period by the weighted average number of common shares outstanding during the period using the two class method. Diluted earnings (loss) per share is calculated by dividing the net income (loss) attributable to common shares for the period by the weighted average number of common and dilutive securities outstanding during the period.
Earnings (Loss) Per Unit of the Operating Partnership
Basic earnings (loss) per unit is calculated by dividing the net income (loss) attributable to common units for the period by the weighted average number of common units outstanding during the period using the two class method. Diluted earnings (loss) per unit is calculated by dividing the net income (loss) attributable to common units for the period by the weighted average number of common and dilutive securities outstanding during the period.
Stock-based Compensation
DFT awards stock-based compensation to employees and members of its Board of Directors in the form of common stock. For each stock award granted by DFT, the OP issues an equivalent common unit, which may be referred to herein as a common share, common stock, or common unit. The Company estimates the fair value of the awards and recognizes this value over the requisite vesting period. The fair value of restricted stock-based compensation is based on the market value of DFT’s common stock on the date of the grant. The fair value of options to purchase common stock is based on the Black-Scholes model. The fair value of performance units is based on a Monte Carlo simulation.
Reclassifications
Certain amounts from the prior year have been reclassified for consistency with the current year presentation.

3_Real_Estate_Assets

3. Real Estate Assets	9 Months Ended
	Sep. 30, 2013
Real Estate [Abstract]
Real Estate Disclosure [Text Block]	Real Estate Assets
	The following is a summary of properties owned by the Company at September 30, 2013 (dollars in thousands):
	Property	Location		Land		Buildings and		Construction		Total Cost
						Improvements		in Progress
								and Land Held
								for
								Development
	ACC2	Ashburn, VA		$	2,500	$	159,093	$	—	$	161,593
	ACC3	Ashburn, VA		1,071		95,608		—		96,679
	ACC4	Ashburn, VA		6,600		538,090		—		544,690
	ACC5	Ashburn, VA		6,443		297,862		—		304,305
	ACC6	Ashburn, VA		5,518		215,220		—		220,738
	VA3	Reston, VA		9,000		177,489		—		186,489
	VA4	Bristow, VA		6,800		148,481		—		155,281
	CH1	Elk Grove Village, IL		23,611		358,403		—		382,014
	NJ1 Phase I	Piscataway, NJ		4,311		208,798		—		213,109
	SC1 Phase I	Santa Clara, CA		10,102		221,079		—		231,181
				75,956		2,420,123		—		2,496,079
	Construction in progress and land held for development	(1	)	—		—		197,400		197,400
				$	75,956	$	2,420,123	$	197,400	$	2,693,479
	-1	Properties located in Ashburn, VA (ACC7 and ACC8); Piscataway, NJ (NJ1 Phase II), Elk Grove Village, IL (CH2) and Santa Clara, CA (SC1 Phase II and SC2).

4_Debt

4. Debt	9 Months Ended
	Sep. 30, 2013
Debt Disclosure [Abstract]
Debt Disclosure [Text Block]	Debt
	Debt Summary as of September 30, 2013 and December 31, 2012
	($ in thousands)
		September 30, 2013													December 31, 2012
		Amounts				% of Total			Rates			Maturities			Amounts
												(years)
	Secured	$	115,000			12	%		2	%		4.5			$	139,600
	Unsecured	851,889				88	%		5.7	%		6.4			568,000
	Total	$	966,889			100	%		5.3	%		6.2			$	707,600
	Fixed Rate Debt:
	Unsecured Notes due 2021	$	600,000			62	%		5.9	%		8			$	—
	Unsecured Notes due 2017	131,889				14	%		8.5	%		0.1			550,000
	Fixed Rate Debt	731,889				76	%		6.3	%		6.5			550,000
	Floating Rate Debt:
	Unsecured Credit Facility	—				—			—			2.5			18,000
	Unsecured Term Loan	120,000				12	%		1.9	%		5.4			—
	ACC3 Term Loan	115,000				12	%		2	%		4.5			—
	ACC5 Term Loan	—				—			—			—			139,600
	Floating Rate Debt	235,000				24	%		2	%		4.9			157,600
	Total	$	966,889			100	%		5.3	%		6.2			$	707,600
	Note:	The Company capitalized interest and deferred financing cost amortization of $1.1 million and $1.6 million during the three and nine months ended September 30, 2013, respectively.
	Outstanding Indebtedness
	ACC3 Term Loan
	On March 27, 2013, the Company entered into a $115 million term loan facility (the “ACC3 Term Loan”). The ACC3 Term Loan matures on March 27, 2018 and the borrower, a subsidiary of the Company, may elect to have borrowings under the facility bear interest at (i) LIBOR plus 1.85% or (ii) a base rate, which is based on the lender's prime rate, plus 0.85%. The interest rate is currently at LIBOR plus 1.85%. The Company may prepay the ACC3 Term Loan at any time, in whole or in part, without penalty or premium.
	The loan is secured by the ACC3 data center and an assignment of the lease agreement between the Company and the tenant of ACC3. The Operating Partnership has guaranteed the outstanding principal amount of the ACC3 Term Loan, plus interest and certain costs under the loan.
	The ACC3 Term Loan imposes financial maintenance covenants relating to, among other things, the following matters:
	•	consolidated total indebtedness of the Operating Partnership not exceeding 60% of gross asset value of the Operating Partnership;
	•	fixed charge coverage ratio of the Operating Partnership being not less than 1.70 to 1.00;
	•	tangible net worth of the Operating Partnership being not less than $1.3 billion plus 80% of the sum of (i) net equity offering proceeds and (ii) the value of equity interests issued in connection with a contribution of assets to the Operating Partnership or its subsidiaries; and
	•	debt service coverage ratio of the borrower not less than 1.50 to 1.00.
	The Company was in compliance with all of the covenants under the loan as of September 30, 2013.
	Unsecured Term Loan
	On September 13, 2013, the Company entered into a senior unsecured term loan (the "Unsecured Term Loan") providing for a $195 million facility. The Unsecured Term Loan matures on February 15, 2019, with no extension option. The Company drew $120.0 million under the Unsecured Term Loan at closing. Pursuant to a "delayed draw" feature in the loan agreement, the remaining $75 million balance can be advanced to the Company at any time subsequent to loan closing, in full or in increments of at least $25 million, provided that the full amount of the loan must be drawn no later than January 10, 2014.
	The Unsecured Term Loan includes an accordion feature permitting an increase in the amount of the loan by up to an additional $55 million. On October 18, 2013, this accordion was exercised and the Unsecured Term Loan was increased to $250 million. An additional $34.0 million was advanced at the time of the accordion exercise, and the remaining $96.0 million must be advanced no later than January 10, 2014.
	Under the terms of the loan, the Company may elect to have borrowings under the loan bear interest at either LIBOR or a base rate, which is based on the lender's prime rate, in each case plus an applicable margin. Prior to the Company's Unsecured Notes Due 2021 receiving an investment grade credit rating, the applicable margin added to LIBOR and the base rate is based on the table below.
					Applicable Margin
	Pricing Level		Ratio of Total Indebtedness to Gross Asset Value		LIBOR Rate Loans			Base Rate Loans
	Level 1		Less than or equal to 35%		1.75	%		0.75	%
	Level 2		Greater than 35% but less than or equal to 40%		1.9	%		0.9	%
	Level 3		Greater than 40% but less than or equal to 45%		2.05	%		1.05	%
	Level 4		Greater than 45% but less than or equal to 52.5%		2.2	%		1.2	%
	Level 5		Greater than 52.5%		2.4	%		1.4	%
	As of September 30, 2013, the applicable margin was set at pricing level 1. The terms of the loan provide for the adjustment of the applicable margin from time to time according to the ratio of the Operating Partnership’s total indebtedness to gross asset value in effect from time to time.
	The terms of the loan also provide that, in the event the Company receives an investment grade credit rating, borrowings under the loan will bear interest based on the table below.
					Applicable Margin
	Credit Rating Level		Credit Rating		LIBOR Rate Loans			Base Rate Loans
	Level 1		Greater than or equal to A- by S&P or A3 by Moody’s		0.95	%		0	%
	Level 2		Greater than or equal to BBB+ by S&P or Baa1 by Moody’s		1.05	%		0.05	%
	Level 3		Greater than or equal to BBB by S&P or Baa2 by Moody’s		1.2	%		0.2	%
	Level 4		Greater than or equal to BBB- by S&P or Baa3 by Moody’s		1.5	%		0.5	%
	Level 5		Less than BBB- by S&P or Baa3 by Moody’s		1.95	%		0.95	%
	Following the receipt of such investment grade rating, the terms of the loan provide for the adjustment of the applicable margin from time to time according to the rating then in effect.
	The Unsecured Term Loan is unconditionally guaranteed jointly and severally, on a senior unsecured basis by DFT and the direct and indirect subsidiaries of DFT that guaranty the obligations of Unsecured Credit Facility (as defined below).
	The Unsecured Term Loan requires that the Company comply with various covenants that are substantially the same as those applicable under the Unsecured Credit Facility, including with respect to restrictions on liens, incurring indebtedness, making investments, effecting mergers and/or asset sales, and certain restrictions on dividend payments. In addition, the Unsecured Term Loan imposes financial maintenance covenants substantially the same as those under the Unsecured Credit Facility relating to, among other things, the following matters:
	•	unsecured debt not exceeding 60% of the value of unencumbered assets;
	•	net operating income generated from unencumbered properties divided by the amount of unsecured debt being not less than 12.5%;
	•	total indebtedness not exceeding 60% of gross asset value;
	•	fixed charge coverage ratio being not less than 1.70 to 1.00; and
	•	tangible net worth being not less than $1.3 billion plus 80% of the sum of (i) net equity offering proceeds after March 21, 2012 and (ii) the value of equity interests issued in connection with a contribution of assets to the Operating Partnership or its subsidiaries after March 21, 2012.
	The Unsecured Term Loan includes customary events of default, the occurrence of which, following any applicable cure period, would permit the Lenders to, among other things, declare the principal, accrued interest and other obligations of the Borrower under the Facility to be immediately due and payable.
	The Company was in compliance with all of the covenants under the loan as of September 30, 2013.
	Unsecured Notes due 2021
	On September 24, 2013, the Operating Partnership completed the sale of $600 million 5.875% senior notes due 2021 (the “Unsecured Notes due 2021”). The Unsecured Notes due 2021 were issued at face value. The Company will pay interest on the Unsecured Notes due 2021 semi-annually, in arrears, on March 15th and September 15th of each year, beginning March 15, 2014.
	The Unsecured Notes due 2021 are unconditionally guaranteed, jointly and severally on a senior unsecured basis by DFT and certain of the Operating Partnership’s subsidiaries, including the subsidiaries that own the ACC2, ACC4, ACC5, ACC6, VA3, VA4, CH1, NJ1 and SC1 data centers and the SC2 parcels of land (collectively, the “Subsidiary Guarantors”), but excluding the subsidiaries that own the ACC3 data center facility, the ACC7 data center under development, the ACC8 and CH2 parcels of land, the Company’s taxable REIT subsidiary (“TRS”), DF Technical Services, LLC and the Company's property management subsidiary, DF Property Management LLC.
The Unsecured Notes due 2021 rank (i) equally in right of payment with all of the Operating Partnership's existing and future senior unsecured indebtedness, (ii) senior in right of payment with all of its existing and future subordinated indebtedness, (iii) effectively subordinate to any of the Operating Partnership's existing and future secured indebtedness and (iv) effectively junior to any liabilities of any subsidiaries of the Operating Partnership that do not guarantee the Unsecured Notes. The guarantees of the Unsecured Notes due 2021 by DFT and the Subsidiary Guarantors rank (i) equally in right of payment with such guarantor's existing and future senior unsecured indebtedness, (ii) senior in right of payment with all of such guarantor's existing and future subordinated indebtedness and (iii) effectively subordinate to any of such guarantor's existing and future secured indebtedness.
At any time prior to September 15, 2016, the Operating Partnership may redeem the Unsecured Notes due 2021, in whole or in part, at a price equal to the sum of (i) 100% of the principal amount of the Unsecured Notes due 2021 to be redeemed, plus (ii) a make-whole premium and accrued and unpaid interest. The notes may be redeemed at the option of the Operating Partnership, in whole or in part, at any time, on and after September 15, 2016 at the following redemption prices (expressed as percentages of the principal amount thereof) if redeemed during the 12-month period commencing September 15 of the years indicated below, in each case together with accrued and unpaid interest to the date of redemption:
Year	Redemption Price
2016	104.406	%
2017	102.938	%
2018	101.469	%
2019 and thereafter	100	%
If there is a change of control (as defined in the indenture) of the Operating Partnership or DFT, the Operating Partnership must offer to purchase the Unsecured Notes due 2021 at a price equal to 101% of the principal amount thereof, plus accrued and unpaid interest. In addition, in certain circumstances the Operating Partnership may be required to use the net proceeds of asset sales to purchase a portion of the Unsecured Notes due 2021 at 100% of the principal amount thereof, plus accrued and unpaid interest.
The Unsecured Notes due 2021 have certain covenants limiting or prohibiting the ability of the Operating Partnership and certain of its subsidiaries from, among other things, (i) incurring secured or unsecured indebtedness, (ii) entering into sale and leaseback transactions, (iii) making certain dividend payments, distributions, purchases of the Company's common stock and investments, (iv) entering into transactions with affiliates, (v) entering into agreements limiting the ability to make certain transfers and other payments from subsidiaries, (vi) engaging in sales of assets or (vii) engaging in certain mergers, consolidations or transfers/sales of all or substantially all assets. The Unsecured Notes due 2021 also require the Operating Partnership and the Subsidiary Guarantors to maintain total unencumbered assets of at least 150% of their unsecured debt on a consolidated basis. The Unsecured Notes due 2021 also have customary events of default, including, but not limited to, nonpayment, breach of covenants, and payment or acceleration defaults in certain other indebtedness of the Company or certain of its subsidiaries. Upon an event of default, the holders of the Unsecured Notes due 2021 or the trustee may declare the Unsecured Notes due 2021 due and immediately payable. The Company was in compliance with all covenants under the Unsecured Notes due 2021 as of September 30, 2013.
Unsecured Credit Facility
In June 2013, the Company exercised the accordion feature on its unsecured revolving credit facility ("Unsecured Credit Facility"), resulting in an increase in total commitment from $225 million to $400 million. The maturity date of the facility is March 21, 2016, with a one-year extension option, subject to the payment of an extension fee equal to 25 basis points on the total commitment in effect on the maturity date and certain other customary conditions.
Under the terms of the facility, the Company may elect to have borrowings under the facility bear interest at either LIBOR or a base rate, which is based on the lender's prime rate, in each case plus an applicable margin. Prior to the Company's Unsecured Notes due 2021 receiving an investment grade credit rating, the applicable margin added to LIBOR and the base rate is based on the table below.
				Applicable Margin
Pricing Level		Ratio of Total Indebtedness to Gross Asset Value		LIBOR Rate Loans			Base Rate Loans
Level 1		Less than or equal to 35%		1.85	%		0.85	%
Level 2		Greater than 35% but less than or equal to 40%		2	%		1	%
Level 3		Greater than 40% but less than or equal to 45%		2.15	%		1.15	%
Level 4		Greater than 45% but less than or equal to 52.5%		2.3	%		1.3	%
Level 5		Greater than 52.5%		2.5	%		1.5	%
As of September 30, 2013, the applicable margin was set at pricing level 1. The terms of the facility provide for the adjustment of the applicable margin from time to time according to the ratio of the Operating Partnership’s total indebtedness to gross asset value in effect from time to time.
The terms of the facility also provide that, in the event the Company receives an investment grade credit rating, borrowings under the facility will bear interest based on the table below.
				Applicable Margin
Credit Rating Level		Credit Rating		LIBOR Rate Loans			Base Rate Loans
Level 1		Greater than or equal to A- by S&P or A3 by Moody’s		1.05	%		0.05	%
Level 2		Greater than or equal to BBB+ by S&P or Baa1 by Moody’s		1.2	%		0.2	%
Level 3		Greater than or equal to BBB by S&P or Baa2 by Moody’s		1.35	%		0.35	%
Level 4		Greater than or equal to BBB- by S&P or Baa3 by Moody’s		1.5	%		0.5	%
Level 5		Less than BBB- by S&P or Baa3 by Moody’s		2.1	%		1.1	%
Following the receipt of such investment grade rating, the terms of the facility provide for the adjustment of the applicable margin from time to time according to the rating then in effect.
The facility is unconditionally guaranteed, jointly and severally, on a senior unsecured basis by DFT and all of the Operating Partnership’s subsidiaries that currently guaranty the obligations under the Company’s indenture governing the terms of the Unsecured Notes due 2021, listed above.
The amount available for borrowings under the facility is determined according to a calculation comparing the value of certain unencumbered properties designated by the Operating Partnership at such time relative to the amount of the Operating Partnership's unsecured debt. Up to $35 million of the borrowings under the facility may be used for letters of credit.
In June 2013, the Company amended its unsecured credit facility to provide for an option to increase the total commitment under the facility to $600 million, if one or more lenders commit to being a lender for the additional amount and certain other customary conditions are met.
As of September 30, 2013, no amounts were outstanding under the facility, with no letters of credit.
The facility requires that DFT, the Operating Partnership and their subsidiaries comply with various covenants, including with respect to restrictions on liens, incurring indebtedness, making investments, effecting mergers and/or asset sales, and certain limits on dividend payments, distributions and purchases of DFT's stock. In addition, the facility imposes financial maintenance covenants relating to, among other things, the following matters:
•	unsecured debt not exceeding 60% of the value of unencumbered assets;
•	net operating income generated from unencumbered properties divided by the amount of unsecured debt being not less than 12.5%;
•	total indebtedness not exceeding 60% of gross asset value;
•	fixed charge coverage ratio being not less than 1.70 to 1.00; and
•	tangible net worth being not less than $1.3 billion plus 80% of the sum of (i) net equity offering proceeds and (ii) the value of equity interests issued in connection with a contribution of assets to the Operating Partnership or its subsidiaries.
The facility includes customary events of default, the occurrence of which, following any applicable cure period, would permit the lenders to, among other things, declare the principal, accrued interest and other obligations of the Operating Partnership under the facility to be immediately due and payable. The Company was in compliance with all covenants under the facility as of September 30, 2013.
Indebtedness Retired During 2013
ACC5 Term Loan
On December 2, 2009, the Company entered into a $150 million term loan facility (the “ACC5 Term Loan”). In March 2013, the Company paid off the $138.3 million remaining balance of the ACC5 Term Loan which resulted in a write-off of unamortized deferred financing costs of $1.7 million in the first quarter of 2013. The ACC5 Term Loan was scheduled to mature on December 2, 2014 and bore interest at LIBOR plus 3.00%.
Unsecured Notes due 2017
On December 16, 2009, the Operating Partnership completed the sale of $550 million of 8.5% senior notes due 2017 (the “Unsecured Notes due 2017”). The Unsecured Notes due 2017 were issued at face value. The Company paid interest on the Unsecured Notes due 2017 semi-annually, in arrears, on December 15 and June 15 of each year. In September 2013, the Company commenced a tender offer to repurchase the notes at 106.04%. Under the early deadline for this offer, $418.1 million of these notes were tendered and the Company paid $25.5 million in tender consideration and fees, in addition to accrued interest due through the repayment date. The early repayment of these notes resulted in a write-off of unamortized deferred financing costs of $5.1 million. This write-off, as well as the tender consideration and fees, is included in loss on early extinguishment of debt on the accompanying statements of operations. The remaining $131.9 million of Unsecured Notes due 2017 were irrevocably called in September 2013 and paid off in October 2013 at a premium of $7.1 million, which resulted in the write-off the remaining unamortized deferred financing costs related to these notes totaling $1.6 million.
A summary of the Company’s debt maturity schedule as of September 30, 2013 is as follows:
Debt Maturity as of September 30, 2013
($ in thousands)
Year		Fixed Rate					Floating Rate					Total				% of Total		Rates
2013		$	131,889		-1		$	—				$	131,889			13.6	%	8.5	%
2014		—					—					—				—		—
2015		—					—					—				—		—
2016		—					3,750			-3		3,750				0.4	%	2	%
2017		—					8,750			-3		8,750				0.9	%	2	%
2018		—					102,500			-3		102,500				10.6	%	2	%
2019		—					120,000			-4		120,000				12.4	%	1.9	%
2020		—					—					—				—		—
2021		600,000			-2		—					600,000				62.1	%	5.9	%
Total		$	731,889				$	235,000				$	966,889			100	%	5.3	%
-1	The remaining Unsecured Notes due 2017 were irrevocably called on September 24, 2013 and were redeemed on October 24, 2013.
-2	The 5.875% Unsecured Notes due 2021 were issued in September 2013.
-3	The ACC3 Term Loan matures on March 27, 2018 with no extension option. Quarterly principal payments of $1.25 million begin on April 1, 2016, increase to $2.5 million on April 1, 2017 and continue through maturity.
-4	The Unsecured Term Loan matures on February 15, 2019 with no extension option. In October 2013, the Company exercised the accordion feature, increasing this loan to $250 million and drawing an additional $34.0 million. The remaining balance of $96.0 million must be drawn by January 10, 2014.

5_Commitments_and_Contingencie

5. Commitments and Contingencies	9 Months Ended
	Sep. 30, 2013
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies Disclosure [Text Block]	Commitments and Contingencies
	The Company is involved from time to time in various legal proceedings, lawsuits, examinations by various tax authorities and claims that have arisen in the ordinary course of business. Management currently believes that the resolution of such matters will not have a material adverse effect on the Company’s financial condition or results of operations.
	Contracts related to the development of ACC7 Phase I and SC1 Phase IIA data centers were in place as of September 30, 2013. These contracts are cost plus in nature whereby the contract sum is the aggregate of the actual work performed and equipment purchased plus a contractor fee. Control estimates, which are adjusted from time to time to reflect any contract changes, are estimates of the total contract cost at completion. As of September 30, 2013 the ACC7 Phase I control estimate was $157.4 million of which $51.4 million had been incurred. An additional $49.4 million has been committed under this contract as of September 30, 2013. As of September 30, 2013, the SC1 Phase IIA control estimate was $108.4 million of which $3.7 million has been incurred. An additional $16.7 million has been committed under this contract as of September 30, 2013.
	Concurrent with DFT’s October 2007 initial public offering, the Company entered into tax protection agreements with some of the contributors of the initial properties including DFT’s Chairman of the Board and President and CEO. Pursuant to the terms of these agreements, if the Company disposes of any interest in the initial contributed properties that generates more than a certain allowable amount of built-in gain for the contributors, as a group, in any single year through 2017, the Company will indemnify the contributors for a portion of the tax liabilities incurred with respect to the amount of built-in gain and tax liabilities incurred as a result of the reimbursement payment. The amount of initial built-in gain that can be recognized as of January 1, 2013 without triggering the tax protection provisions is approximately 60% of the initial built in gain of $667 million (unaudited) or $400 million (unaudited). This percentage grows each year by 10%, accumulating to 100% in 2017. If, as of January 1, 2013, the tax protection provisions were triggered, the Company could be liable for protection on the taxes related to approximately up to $267 million (unaudited) of built-in gain. Additionally, the Company must provide an opportunity for certain of the contributors of the initial properties to guarantee a secured loan. Any sale by the Company that requires payments to any of DFT’s executive officers or directors pursuant to these agreements requires the approval of at least 75% of the disinterested members of DFT’s Board of Directors.

6_Redeemable_noncontrolling_in

6. Redeemable noncontrolling interests operating partnership / Redeemable partnership units	9 Months Ended
	Sep. 30, 2013
Redeemable noncontrolling interests – operating partnership / Redeemable partnership units [Abstract]
Redeemable noncontrolling interests – operating partnership / Redeemable partnership units [Text Block]	Redeemable noncontrolling interests – operating partnership / Redeemable partnership units
	Redeemable noncontrolling interests – operating partnership, as presented on DFT’s consolidated balance sheets, represent the OP units held by individuals and entities other than DFT. These interests are also presented on the Operating Partnership’s consolidated balance sheets, referred to as “redeemable partnership units.” Accordingly, the following discussion related to redeemable noncontrolling interests – operating partnership of the REIT refers equally to redeemable partnership units of the Operating Partnership.
	The redemption value of redeemable noncontrolling interests – operating partnership as of September 30, 2013 and December 31, 2012 was $409.3 million and $453.9 million, respectively, based on the closing share price of DFT’s common stock of $25.77 and $24.16, respectively, on those dates.
	Holders of OP units are entitled to receive distributions in a per unit amount equal to the per share dividends made with respect to each share of DFT’s common stock, if and when DFT’s Board of Directors declares such a dividend. Holders of OP units have the right to tender their units for redemption, in an amount equal to the fair market value of DFT’s common stock. DFT may elect to redeem tendered OP units for cash or for shares of DFT’s common stock. During the nine months ended September 30, 2013, OP unitholders redeemed a total of 2,904,769 OP units in exchange for an equal number of shares of common stock. See Note 2.

7_Preferred_Stock

7. Preferred Stock	9 Months Ended
	Sep. 30, 2013
Preferred Stock [Abstract]
Preferred Stock [Text Block]	Preferred Stock
	Series A Preferred Stock
	In October 2010, DFT issued 7,400,000 shares of 7.875% Series A Cumulative Redeemable Perpetual Preferred Stock (“Series A Preferred Stock”) for $185.0 million in an underwritten public offering. The liquidation preference on the Series A Preferred Stock is $25 per share and dividends are scheduled quarterly. For each share of Series A Preferred Stock issued by DFT, the Operating Partnership issued a preferred unit equivalent to DFT with the same terms.
	In 2013, DFT declared and paid the following cash dividends on its Series A Preferred Stock, of which the OP paid equivalent distributions on its preferred units:
	•	$0.4921875 per share payable to stockholders of record as of April 5, 2013. This dividend was paid on April 15, 2013.
	•	$0.4921875 per share payable to stockholders of record as of July 5, 2013. This dividend was paid on July 15, 2013.
	•	$0.4921875 per share payable to stockholders of record as of October 4, 2013. This dividend was paid on October 15, 2013.
	Series B Preferred Stock
	In March 2011 and January 2012, DFT issued an aggregate of 6,650,000 shares of 7.625% Series B Cumulative Redeemable Perpetual Preferred Stock (“Series B Preferred Stock”) for $166.3 million in underwritten public offerings. The liquidation preference on the Series B Preferred Stock is $25 per share and dividends are scheduled quarterly. For each share of Series B Preferred Stock issued by DFT, the Operating Partnership issued a preferred unit equivalent to DFT with the same terms.
	In 2013, DFT declared and paid the following cash dividends on its Series B Preferred Stock, of which the OP paid equivalent distributions on its preferred units:
	•	$0.4765625 per share payable to stockholders of record as of April 5, 2013. This dividend was paid on April 15, 2013.
	•	$0.4765625 per share payable to stockholders of record as of July 5, 2013. This dividend was paid on July 15, 2013.
	•	$0.4765625 per share payable to stockholders of record as of October 4, 2013. This dividend was paid on October 15, 2013.

8_Stockholders_Equity_of_the_R

8. Stockholders Equity of the REIT and Partners Capital of the OP	9 Months Ended
	Sep. 30, 2013
Stockholders’ Equity of the REIT and Partners’ Capital of the OP [Abstract]
Stockholders' Equity Of The REIT And Partners' Capital Of The OP [Text Block]	Stockholders’ Equity of the REIT and Partners’ Capital of the OP
	During the nine months ended September 30, 2013:
	•	DFT issued an aggregate of 152,931 shares of common stock in connection with the Company’s annual grant of restricted stock to employees, the hiring of new employees and grants and retainers for its Board of Directors. The OP issued an equivalent number of units to the REIT.
	•	OP unitholders redeemed a total of 2,904,769 OP units in exchange for an equal number of shares of DFT’s common stock.
	In 2013, DFT declared and paid the following cash dividends per share on its common stock, of which the OP paid equivalent distributions on OP units:
	•	$0.20 per share payable to stockholders of record as of April 5, 2013. This dividend was paid on April 15, 2013.
	•	$0.25 per share payable to stockholders of record as of July 5, 2013. This dividend was paid on July 15, 2013.
	•	$0.25 per share payable to stockholders of record as of October 4, 2013. This dividend was paid on October 15, 2013.
	On November 19, 2012, the Board of Directors authorized a Repurchase Program to acquire up to $80.0 million of DFT's common shares. In September 2013, the Board of Directors approved a new common stock repurchase program that will commence at the expiration of the existing program and expire on December 31, 2014. During the nine months ended September 30, 2013, DFT repurchased 1,632,673 shares of its common stock totaling $37.8 million. All repurchased shares were retired immediately.

9_Equity_Compensation_Plan

9. Equity Compensation Plan	9 Months Ended
	Sep. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]	Equity Compensation Plan
	In May 2011, DFT’s Board of Directors adopted the 2011 Equity Incentive Plan (the “2011 Plan”) following approval from its stockholders. The 2011 Plan is administered by the Compensation Committee of DFT’s Board of Directors. The 2011 Plan allows the Company to provide equity-based compensation to its personnel in the form of stock options, stock appreciation rights, dividend equivalent rights, restricted stock, restricted stock units, performance-based awards, unrestricted stock, long term incentive units (“LTIP units”) and other awards.
	The 2011 Plan authorizes a maximum aggregate of 6,300,000 share equivalents be reserved for future issuances. In addition, shares that were awarded under the Company’s 2007 Equity Compensation Plan (the “2007 Plan”) that subsequently become available due to forfeitures of such awards will be available for issuance under the 2011 Plan.
	The 2011 Plan provides that awards can no longer be made under the 2007 Plan. Furthermore, under the 2011 Plan, shares of common stock that are subject to awards of options or stock appreciation rights will be counted against the 2011 Plan share limit as one share for every one share subject to the award. Any shares of stock that are subject to awards other than options or stock appreciation rights shall be counted against the 2011 Plan share limit as 2.36 shares for every one share subject to the award.
	As of September 30, 2013, 1,634,354 share equivalents were issued under the 2011 Plan, and the maximum aggregate amount of share equivalents remaining available for future issuance was 4,665,646.
	Restricted Stock
	Restricted stock awards vest over specified periods of time as long as the employee remains employed with the Company. The following table sets forth the number of unvested shares of restricted stock and the weighted average fair value of these shares at the date of grant:
		Shares of			Weighted Average
		Restricted Stock			Fair Value at
					Date of Grant
	Unvested balance at December 31, 2012	297,919			$	22.31
	Granted	139,963			$	22.78
	Vested	(158,521	)		$	21.71
	Forfeited	(7,203	)		$	22.77
	Unvested balance at September 30, 2013	272,158			$	22.89
	During the nine months ended September 30, 2013, the Company issued 139,963 shares of restricted stock, which had an aggregate value of $3.2 million on the respective grant dates. This amount will be amortized to expense over a three year vesting period. Also during the nine months ended September 30, 2013, 158,521 shares of restricted stock vested at a value of $3.7 million on the respective vesting dates.
	As of September 30, 2013, total unearned compensation on restricted stock was $4.3 million, and the weighted average vesting period was 1.1 years.
	Stock Options
	Stock option awards are granted with an exercise price equal to the closing market price of DFT’s common stock at the date of grant and vest over specified periods of time as long as the employee remains employed with the Company. All shares to be issued upon option exercises will be newly issued shares and the options have 10-year contractual terms.
	A summary of the Company’s stock option activity under the applicable equity incentive plan for the nine months ended September 30, 2013 is presented in the tables below.
		Number of			Weighted Average
		Options			Exercise Price
	Under option, December 31, 2012	2,076,781			$	15.17
	Granted	374,214			$	22.62
	Exercised	(12,000	)		$	5.06
	Forfeited	—			$	—
	Under option, September 30, 2013	2,438,995			$	16.37
		Shares Subject			Total Unearned			Weighted Average		Weighted Average
		to Option			Compensation			Vesting Period		Remaining
										Contractual Term
	As of September 30, 2013	2,438,995			$	2.9	million	1.0 year		7.0 years
	The following table sets forth the number of unvested options as of September 30, 2013 and the weighted average fair value of these options at the grant date.
		Number of			Weighted Average
		Options			Fair Value
					at Date of Grant
	Unvested balance at December 31, 2012	809,991			$	6.96
	Granted	374,214			$	4.75
	Vested	(399,481	)		$	7.34
	Forfeited	—			$	—
	Unvested balance at September 30, 2013	784,724			$	5.71
	The following tables sets forth the number of exercisable options as of September 30, 2013 and the weighted average fair value and exercise price of these options at the grant date.
		Number of			Weighted Average
		Options			Fair Value
					at Date of Grant
	Options Exercisable at December 31, 2012	1,266,790			$	3.52
	Vested	399,481			$	7.34
	Exercised	(12,000	)		$	1.48
	Options Exercisable at September 30, 2013	1,654,271			$	4.46
		Exercisable			Intrinsic Value			Weighted Average			Weighted Average
		Options						Exercise Price			Remaining
											Contractual Term
	As of September 30, 2013	1,654,271			$	20.7	million	$	13.26		6.3 years
	The fair value of each option award is estimated on the date of grant using a Black-Scholes option valuation model. Expected volatility used in the Black-Scholes model is based on DFT’s historical volatility. The risk-free rate for periods within the contractual life of the option is based on the U.S. Treasury yield curve in effect at the time of grant. The following table summarizes the assumptions used to value the stock options granted and the fair value of these options granted during the nine months ended September 30, 2013.
		Assumption
	Number of options granted	374,214
	Exercise price	$	22.62
	Expected term (in years)	5
	Expected volatility	34		%
	Expected annual dividend	4		%
	Risk-free rate	0.83		%
	Fair value at date of grant	$1.8 million
	Performance Units
	Performance unit awards are awarded to certain executive employees and have a three calendar-year performance period with no dividend rights. Performance units will be settled in common shares following the performance period as long as the employee remains employed with the Company on the vesting date, which is the March 1st date following the last day of the applicable performance period. Performance units are valued using a Monte Carlo simulation and are amortized over the three year vesting period from the grant date to the vesting date. The number of common shares settled could range from 0% to 300% of target, depending on DFT’s total stockholder return compared to the MSCI US REIT index over the three calendar-year performance period. The following table summarizes the assumptions used to value, and the resulting fair and maximum values of, the performance units granted during the nine months ended September 30, 2013.
		Assumption
Number of performance units granted	60,468
Expected volatility	33		%
Expected annual dividend	4		%
Risk-free rate	0.4		%
Performance unit fair value at date of grant	$	25.59
Total grant fair value at date of grant	$1.5 million
Maximum value of grant on vesting date based on closing price of DFT's stock at the date of grant	$4.1 million
As of September 30, 2013, total unearned compensation on outstanding performance units was $2.0 million.

10_Earnings_Per_Share_of_the_R

10. Earnings Per Share of the REIT	9 Months Ended
	Sep. 30, 2013
Earnings Per Share [Abstract]
Earnings Per Share [Text Block]	Earnings Per Share of the REIT
	The following table sets forth the reconciliation of basic and diluted average shares outstanding used in the computation of earnings per share of common stock (in thousands except for share and per share amounts):
		Three months ended September 30,							Nine months ended September 30,
		2013				2012			2013			2012
	Basic and Diluted Shares Outstanding
	Weighted average common shares – basic	64,432,010				62,994,500			64,631,772			62,820,979
	Effect of dilutive securities	—				887,163			853,658			906,152
	Weighted average common shares – diluted	64,432,010				63,881,663			65,485,430			63,727,131
	Calculation of Earnings per Share – Basic
	Net (loss) income attributable to common shares	$	(10,228	)		$	7,286		$	9,686		$	19,132
	Net income allocated to unvested restricted shares	(67		)		(45		)	(191		)	(128		)
	Net (loss) income attributable to common shares, adjusted	(10,295		)		7,241			9,495			19,004
	Weighted average common shares – basic	64,432,010				62,994,500			64,631,772			62,820,979
	(Loss) earnings per common share – basic	$	(0.16	)		$	0.11		$	0.15		$	0.3
	Calculation of Earnings per Share – Diluted
	Net (loss) income attributable to common shares	$	(10,228	)		$	7,286		$	9,686		$	19,132
	Adjustments to redeemable noncontrolling interests	(25		)		22			25			62
	Adjusted net (loss) income available to common shares	(10,253		)		7,308			9,711			19,194
	Weighted average common shares – diluted	64,432,010				63,881,663			65,485,430			63,727,131
	Loss (earnings) per common share – diluted	$	(0.16	)		$	0.11		$	0.15		$	0.3
	The following table sets forth the amount of restricted shares, stock options and performance units that have been excluded from the calculation of diluted earnings per share as their effect would have been antidilutive (in millions):
		Three months ended September 30,						Nine months ended September 30,
		2013			2012			2013			2012
	Restricted Shares	0.3			—			—			—
	Stock Options	2.4			0.9			1.2			0.9
	Performance Units	0.1			0.1			0.1			0.1

11_Earnings_Per_Unit_of_the_Op

11. Earnings Per Unit of the Operating Partnership	9 Months Ended
	Sep. 30, 2013
Earnings Per Unit [Abstract]
Earnings per unit of the Operating Partnership [Text Block]	Earnings Per Unit of the Operating Partnership
	The following table sets forth the reconciliation of basic and diluted average units outstanding used in the computation of earnings per unit:
		Three months ended September 30,		Nine months ended September 30,
		2013	2012	2013	2012
	Basic and Diluted Units Outstanding
	Weighted average common units – basic (includes redeemable partnership units and units of general and limited partners)	80,321,840	81,826,688	80,626,882	81,724,511
	Effect of dilutive securities	—	887,163	853,658	906,152
	Weighted average common units – diluted	80,321,840	82,713,851	81,480,540	82,630,663
	The following table sets forth the amount of restricted units, stock options and performance units that have been excluded from the calculation of diluted earnings per unit as their effect would have been antidilutive (in millions):
		Three months ended September 30,		Nine months ended September 30,
		2013	2012	2013	2012
	Restricted Units	0.3	—	—	—
	Stock Options	2.4	0.9	1.2	0.9
	Performance Units	0.1	0.1	0.1	0.1

12_Fair_Value

12. Fair Value	9 Months Ended
	Sep. 30, 2013
Fair Value Disclosures [Abstract]
Fair Value Disclosures [Text Block]	Fair Value
	Assets and Liabilities Measured at Fair Value
	The authoritative guidance issued by the FASB requires disclosure of the fair value of financial instruments. Fair value estimates are subjective in nature and are dependent on a number of important assumptions, including estimates of future cash flows, risks, discount rates, and relevant comparable market information associated with each financial instrument. The use of different market assumptions and estimation methodologies may have a material effect on the reported estimated fair value amounts. Accordingly, the amounts are not necessarily indicative of the amounts the Company would realize in a current market exchange.
	The following methods and assumptions were used in estimating the fair value amounts and disclosures for financial instruments as of September 30, 2013:
	•	Cash and cash equivalents: The carrying amount of cash and cash equivalents reported in the consolidated balance sheets approximates fair value because of the short maturity of these instruments (i.e., less than 90 days).
	•	Restricted cash: The carrying amount of restricted cash reported in the consolidated balance sheets approximates fair value because of the short maturities of these instruments.
	•	Rents and other receivables, accounts payable and accrued liabilities, and prepaid rents: The carrying amount of these assets and liabilities reported in the consolidated balance sheets approximates fair value because of the short-term nature of these amounts.
	•	Debt: As of September 30, 2013, the combined balance of the Company’s Unsecured Notes due 2021, Unsecured Notes due 2017, Unsecured Term Loan and ACC3 Term Loan was $966.9 million with a fair value of $967.8 million based on Level 1, Level 2 and Level 3 data. The Level 1 data is for the Unsecured Notes due 2021 and consisted of a quote from the market maker for the Unsecured Notes due 2021. The Level 2 data is for the Unsecured Notes due 2017 that were called in September 2013 and repaid in October 2013, the value of which is based on the call price calculation prescribed by the indenture assuming call settlement on September 30, 2013. The Level 3 data is for the ACC3 Loan and is based on discounted cash flows using a one-month LIBOR swap rate of 1.44% as of September 30, 2013 plus a 1.85% spread that is consistent with current market conditions. The Unsecured Term Loan was valued at book value as it closed on September 13, 2013.

13_Supplemental_Consolidating_

13. Supplemental Consolidating Financial Data for Subsidiary Guarantors of the Unsecured Notes	9 Months Ended
	Sep. 30, 2013
Supplemental Consolidating Financial Data for Subsidiary Guarantors of the Unsecured Notes [Abstract]
Additional Financial Information Disclosure [Text Block]	13. Supplemental Consolidating Financial Data for Subsidiary Guarantors of the Unsecured Notes
	In September 2013, the Company commenced a tender offer to repurchase the Unsecured Notes due 2017. Under the early deadline for this offer, $418.1 million of these notes were tendered and the remaining $131.9 million of Unsecured Notes due 2017 were irrevocably called in September 2013 and paid off in October 2013. On September 24, 2013, the Operating Partnership issued the Unsecured Notes due 2021 (See Note 4). The Unsecured Notes due 2017 and Unsecured Notes due 2021 are unconditionally guaranteed, jointly and severally on a senior unsecured basis by DFT and certain of the Company’s subsidiaries, including the subsidiaries that own the ACC2, ACC4, ACC5, ACC6, VA3, VA4, CH1, NJ1 and SC1 data centers and the SC2 parcels of land (collectively, the "Subsidiary Guarantors"), but excluding the subsidiaries that own the ACC3 data center facility, the ACC7 data center under development, the ACC8 and CH2 parcels of land and the TRS (collectively, the "Subsidiary Non-Guarantors"). The following consolidating financial information sets forth the financial position as of September 30, 2013 and December 31, 2012 and the results of operations and cash flows for the three and nine months ended September 30, 2013 and 2012 of the Operating Partnership, Subsidiary Guarantors and the Subsidiary Non-Guarantors.
	DUPONT FABROS TECHNOLOGY, L.P.
	SUPPLEMENTAL CONSOLIDATING BALANCE SHEETS
	(in thousands except share data)
		September 30, 2013
		Operating			Subsidiary			Subsidiary			Eliminations			Consolidated
		Partnership			Guarantors			Non-Guarantors						Total
	ASSETS
	Income producing property:
	Land	$	—		$	74,885		$	1,071		$	—		$	75,956
	Buildings and improvements	—			2,317,597			102,526			—			2,420,123
		—			2,392,482			103,597			—			2,496,079
	Less: accumulated depreciation	—			(365,742		)	(25,662		)	—			(391,404		)
	Net income producing property	—			2,026,740			77,935			—			2,104,675
	Construction in progress and land held for development	—			111,417			85,983			—			197,400
	Net real estate	—			2,138,157			163,918			—			2,302,075
	Cash and cash equivalents	192,976			—			924			—			193,900
	Rents and other receivables	4,059			2,266			1,640			—			7,965
	Deferred rent	—			141,901			6,539			—			148,440
	Lease contracts above market value, net	—			9,429			—			—			9,429
	Deferred costs, net	19,624			17,822			5,862			—			43,308
	Investment in affiliates	2,306,880			—			—			(2,306,880		)	—
	Prepaid expenses and other assets	2,073			38,188			1,876			—			42,137
	Total assets	$	2,525,612		$	2,347,763		$	180,759		$	(2,306,880	)	$	2,747,254
	LIABILITIES AND PARTNERS’ CAPITAL
	Liabilities:
	Line of credit	$	—		$	—		$	—		$	—		$	—
	Mortgage notes payable	—			—			115,000			—			115,000
	Unsecured term loan	120,000			—			—			—			120,000
	Unsecured notes payable	731,889			—			—			—			731,889
	Accounts payable and accrued liabilities	4,698			18,760			3,219			—			26,677
	Construction costs payable	—			3,991			18,252			—			22,243
	Accrued interest payable	4,645			—			6			—			4,651
	Distribution payable	25,902			—			—			—			25,902
	Lease contracts below market value, net	—			11,403			—			—			11,403
	Prepaid rents and other liabilities	49			47,865			3,146			—			51,060
	Total liabilities	887,183			82,019			139,623			—			1,108,825
	Redeemable partnership units	409,280			—			—			—			409,280
	Commitments and contingencies	—			—			—			—			—
	Limited Partners’ Capital:
	Series A cumulative redeemable perpetual preferred units, 7,400,000 issued and outstanding at September 30, 2013	185,000			—			—			—			185,000
	Series B cumulative redeemable perpetual preferred units, 6,650,000 issued and outstanding at September 30, 2013	166,250			—			—			—			166,250
	Common units, 64,059,632 issued and outstanding at September 30, 2013	868,914			2,265,744			41,136			(2,306,880		)	868,914
	General partner’s capital, 662,373 common units issued and outstanding at September 30, 2013	8,985			—			—			—			8,985
	Total partners’ capital	1,229,149			2,265,744			41,136			(2,306,880		)	1,229,149
	Total liabilities & partners’ capital	$	2,525,612		$	2,347,763		$	180,759		$	(2,306,880	)	$	2,747,254
	DUPONT FABROS TECHNOLOGY, L.P.
	SUPPLEMENTAL CONSOLIDATING BALANCE SHEETS
	(in thousands except share data)
		December 31, 2012
		Operating			Subsidiary			Subsidiary			Eliminations			Consolidated
		Partnership			Guarantors			Non-Guarantors						Total
	ASSETS
	Income producing property:
	Land	$	—		$	72,126		$	1,071		$	—		$	73,197
	Buildings and improvements	—			2,210,314			105,185			—			2,315,499
		—			2,282,440			106,256			—			2,388,696
	Less: accumulated depreciation	—			(302,745		)	(22,995		)	—			(325,740		)
	Net income producing property	—			1,979,695			83,261			—			2,062,956
	Construction in progress and land held for development	—			204,533			14,401			—			218,934
	Net real estate	—			2,184,228			97,662			—			2,281,890
	Cash and cash equivalents	18,240			361			681			—			19,282
	Rents and other receivables	15			2,729			1,096			—			3,840
Deferred rent	—			135,937			8,892			—			144,829
Lease contracts above market value, net	—			10,255			—			—			10,255
Deferred costs, net	10,711			20,442			4,517			—			35,670
Investment in affiliates	2,280,723			—			—			(2,280,723		)	—
Prepaid expenses and other assets	2,101			26,877			1,819			—			30,797
Total assets	$	2,311,790		$	2,380,829		$	114,667		$	(2,280,723	)	$	2,526,563
LIABILITIES AND PARTNERS’ CAPITAL
Liabilities:
Line of credit	$	18,000		$	—		$	—		$	—		$	18,000
Mortgage notes payable	—			139,600			—			—			139,600
Unsecured notes payable	550,000			—			—			—			550,000
Accounts payable and accrued liabilities	3,240			16,312			2,728			—			22,280
Construction costs payable	5			6,100			229			—			6,334
Accrued interest payable	2,290			311			—			—			2,601
Distribution payable	22,177			—			—			—			22,177
Lease contracts below market value, net	—			14,022			—			—			14,022
Prepaid rents and other liabilities	53			32,478			2,993			—			35,524
Total liabilities	595,765			208,823			5,950			—			810,538
Redeemable partnership units	453,889			—			—			—			453,889
Commitments and contingencies	—			—			—			—			—
Limited Partners’ Capital:
Series A cumulative redeemable perpetual preferred units, 7,400,000 issued and outstanding at December 31, 2012	185,000			—			—			—			185,000
Series B cumulative redeemable perpetual preferred units, 6,650,000 issued and outstanding at December 31, 2012	166,250			—			—			—			166,250
Common units, 62,678,556 issued and outstanding at December 31, 2012	901,361			2,172,006			108,717			(2,280,723		)	901,361
General partner’s capital, 662,373 common units issued and outstanding at December 31, 2012	9,525			—			—			—			9,525
Total partners’ capital	1,262,136			2,172,006			108,717			(2,280,723		)	1,262,136
Total liabilities & partners’ capital	$	2,311,790		$	2,380,829		$	114,667		$	(2,280,723	)	$	2,526,563
DUPONT FABROS TECHNOLOGY, L.P.
SUPPLEMENTAL CONSOLIDATING STATEMENTS OF OPERATIONS
(in thousands)
	Three months ended September 30, 2013
	Operating			Subsidiary			Subsidiary			Eliminations			Consolidated
	Partnership			Guarantors			Non-Guarantors						Total
Revenues:
Base rent	$	—		$	59,343		$	3,976		$	(38	)	$	63,281
Recoveries from tenants	3,940			28,776			2,911			(3,940		)	31,687
Other revenues	—			382			1,037			(45		)	1,374
Total revenues	3,940			88,501			7,924			(4,023		)	96,342
Expenses:
Property operating costs	—			28,314			2,790			(3,985		)	27,119
Real estate taxes and insurance	—			3,480			150			—			3,630
Depreciation and amortization	18			22,380			1,140			—			23,538
General and administrative	3,534			21			109			—			3,664
Other expenses	161			—			751			(38		)	874
Total expenses	3,713			54,195			4,940			(4,023		)	58,825
Operating income	227			34,306			2,984			—			37,517
Interest income	32			—			—			—			32
Interest:
Expense incurred	(12,467		)	420			(1		)	—			(12,048		)
Amortization of deferred financing costs	(820		)	22			(51		)	—			(849		)
Loss on early extinguishment of debt	(30,610		)	—			—			—			(30,610		)
Equity in earnings	37,680			—			—			(37,680		)	—
Net (loss) income	(5,958		)	34,748			2,932			(37,680		)	(5,958		)
Preferred unit distributions	(6,811		)	—			—			—			(6,811		)
Net (loss) income attributable to common units	$	(12,769	)	$	34,748		$	2,932		$	(37,680	)	$	(12,769	)
	Three months ended September 30, 2012
	Operating			Subsidiary			Subsidiary			Eliminations			Consolidated
	Partnership			Guarantors			Non-Guarantors						Total
Revenues:
Base rent	$	—		$	52,188		$	4,491		$	(38	)	$	56,641
Recoveries from tenants	3,517			24,519			3,240			(3,517		)	27,759
Other revenues	—			305			786			(45		)	1,046
Total revenues	3,517			77,012			8,517			(3,600		)	85,446
Expenses:
Property operating costs	—			24,968			3,118			(3,562		)	24,524
Real estate taxes and insurance	—			4,491			140			—			4,631
Depreciation and amortization	28			21,154			1,349			—			22,531
General and administrative	3,406			21			546			—			3,973
Other expenses	119			—			653			(38		)	734
Total expenses	3,553			50,634			5,806			(3,600		)	56,393
Operating (loss) income	(36		)	26,378			2,711			—			29,053
Interest income	109			—			—			(76		)	33
Interest:
Expense incurred	(11,889		)	(45		)	(76		)	76			(11,934		)
Amortization of deferred financing costs	(682		)	(192		)	—			—			(874		)
Equity in earnings	28,776			—			—			(28,776		)	—
Net income (loss)	16,278			26,141			2,635			(28,776		)	16,278
Preferred unit distributions	(6,811		)	—			—			—			(6,811		)
Net income (loss) attributable to common units	$	9,467		$	26,141		$	2,635		$	(28,776	)	$	9,467
	Nine months ended September 30, 2013
	Operating			Subsidiary			Subsidiary			Eliminations			Consolidated
	Partnership			Guarantors			Non-Guarantors						Total
Revenues:
Base rent	$	—		$	173,651		$	11,936		$	(113	)	$	185,474
Recoveries from tenants	11,317			79,315			7,758			(11,317		)	87,073
Other revenues	—			1,191			2,046			(119		)	3,118
Total revenues	11,317			254,157			21,740			(11,549		)	275,665
Expenses:
Property operating costs	—			79,433			7,401			(11,436		)	75,398
Real estate taxes and insurance	—			10,572			372			—			10,944
Depreciation and amortization	64			66,424			3,285			—			69,773
General and administrative	12,039			78			429			—			12,546
Other expenses	600			296			1,448			(113		)	2,231
Total expenses	12,703			156,803			12,935			(11,549		)	170,892
Operating (loss) income	(1,386		)	97,354			8,805			—			104,773
Interest income	(200		)	20			—			265			85
Interest:
Expense incurred	(36,731		)	(595		)	101			(265		)	(37,490		)
Amortization of deferred financing costs	(2,206		)	(222		)	(114		)	—			(2,542		)
Loss on early extinguishment of debt	(30,610		)	(1,700		)	—			—			(32,310		)
Equity in earnings	103,649			—			—			(103,649		)	—
Net income (loss)	32,516			94,857			8,792			(103,649		)	32,516
Preferred unit distributions	(20,433		)	—			—			—			(20,433		)
Net (loss) income attributable to common units	$	12,083		$	94,857		$	8,792		$	(103,649	)	$	12,083
	Nine months ended September 30, 2012
	Operating			Subsidiary			Subsidiary			Eliminations			Consolidated
	Partnership			Guarantors			Non-Guarantors						Total
Revenues:
Base rent	$	—		$	152,222		$	13,475		$	(113	)	$	165,584
Recoveries from tenants	10,226			68,348			9,225			(10,226		)	77,573
Other revenues	—			903			2,537			(111		)	3,329
Total revenues	10,226			221,473			25,237			(10,450		)	246,486
Expenses:
Property operating costs	—			71,827			8,870			(10,337		)	70,360
Real estate taxes and insurance	—			8,800			415			—			9,215
Depreciation and amortization	90			62,757			4,038			—			66,885
General and administrative	11,807			97			1,810			—			13,714
Other expenses	135			—			2,124			(113		)	2,146
Total expenses	12,032			143,481			17,257			(10,450		)	162,320
Operating (loss) income	(1,806		)	77,992			7,980			—			84,166
Interest income	299			—			—			(187		)	112
Interest:
Expense incurred	(35,608		)	(863		)	(187		)	187			(36,471		)
Amortization of deferred financing costs	(2,069		)	(608		)	—			—			(2,677		)
Equity in earnings	84,314			—			—			(84,314		)	—
Net income (loss)	45,130			76,521			7,793			(84,314		)	45,130
Preferred unit distributions	(20,241		)	—			—			—			(20,241		)
Net income (loss) attributable to common units	$	24,889		$	76,521		$	7,793		$	(84,314	)	$	24,889
DUPONT FABROS TECHNOLOGY, L.P.
SUPPLEMENTAL CONSOLIDATING STATEMENTS OF CASH FLOWS
(in thousands)
	Nine months ended September 30, 2013
	Operating			Subsidiary			Subsidiary			Eliminations			Consolidated
	Partnership			Guarantors			Non-Guarantors						Total
Cash flow from operating activities
Net cash (used in) provided by operating activities	$	(36,793	)	$	165,509		$	11,934		$	—		$	140,650
Cash flow from investing activities
Investments in real estate – development	(8		)	(27,469		)	(22,687		)	—			(50,164		)
Land acquisition costs	—			—			(14,186		)	—			(14,186		)
Investments in affiliates	80,340			6,545			(86,885		)	—			—
Interest capitalized for real estate under development	—			(453		)	(1,069		)	—			(1,522		)
Improvements to real estate	—			(4,871		)	(164		)	—			(5,035		)
Additions to non-real estate property	(6		)	(18		)	—			—			(24		)
Net cash provided by (used in) investing activities	80,326			(26,266		)	(124,991		)	—			(70,931		)
Cash flow from financing activities
Line of credit:
Proceeds	102,000			—			—			—			102,000
Repayments	(120,000		)	—			—			—			(120,000		)
Mortgage notes payable:
Proceeds	—			—			115,000			—			115,000
Lump sum payoffs	—			(138,300		)	—			—			(138,300		)
Repayments	—			(1,300		)	—			—			(1,300		)
Unsecured term loan:
Proceeds	120,000			—			—			—			120,000
Unsecured notes payable:
Proceeds	600,000			—			—			—			600,000
Repayments	(418,111		)	—			—			—			(418,111		)
Payments of financing costs	(16,369		)	(4		)	(1,700		)	—			(18,073		)
Payments for early extinguishment of debt	(25,462		)	—			—			—			(25,462		)
Exercises of stock options	61			—			—			—			61
Stock repurchases	(37,792		)	—			—			—			(37,792		)
Distributions	(73,124		)	—			—			—			(73,124		)
Net cash provided by (used in) financing activities	131,203			(139,604		)	113,300			—			104,899
Net increase (decrease) in cash and cash equivalents	174,736			(361		)	243			—			174,618
Cash and cash equivalents, beginning	18,240			361			681			—			19,282
Cash and cash equivalents, ending	$	192,976		$	—		$	924		$	—		$	193,900
DUPONT FABROS TECHNOLOGY, L.P.
SUPPLEMENTAL CONSOLIDATING STATEMENTS OF CASH FLOWS
(in thousands)
	Nine months ended September 30, 2012
	Operating			Subsidiary			Subsidiary			Eliminations			Consolidated
	Partnership			Guarantors			Non-Guarantors						Total
Cash flow from operating activities
Net cash (used in) provided by operating activities	$	(37,301	)	$	129,718		$	10,323		$	—		$	102,740
Cash flow from investing activities
Investments in real estate – development	(25		)	(73,359		)	(9,370		)	—			(82,754		)
Investments in affiliates	46,653			(45,398		)	(1,255		)	—			—
Interest capitalized for real estate under development	—			(2,654		)	—			—			(2,654		)
Improvements to real estate	—			(3,306		)	(27		)	—			(3,333		)
Additions to non-real estate property	(17		)	(38		)	—			—			(55		)
Net cash provided by (used in) investing activities	46,611			(124,755		)	(10,652		)	—			(88,796		)
Cash flow from financing activities
Line of credit:
Proceeds	15,000			—			—			—			15,000
Repayments	(35,000		)	—			—			—			(35,000		)
Repayments of mortgage notes payable	—			(3,900		)	—			—			(3,900		)
Payments of financing costs	(2,084		)	—			—			—			(2,084		)
Issuance of preferred units, net of offering costs	62,694			—			—			—			62,694
Exercises of stock options	868			—			—			—			868
Advances from related parties	4,000			—			—			—			4,000
Distributions	(51,199		)	—			—			—			(51,199		)
Net cash used in financing activities	(5,721		)	(3,900		)	—			—			(9,621		)
Net increase (decrease) in cash and cash equivalents	3,589			1,063			(329		)	—			4,323
Cash and cash equivalents, beginning	9,174			196			727			—			10,097
Cash and cash equivalents, ending	$	12,763		$	1,259		$	398		$	—		$	14,420

2_Significant_Accounting_Polic1

2. Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2013
Accounting Policies [Abstract]
Basis of Presentation [Text Block]	Basis of Presentation
	This report combines the quarterly reports on Form 10-Q for the quarter ended September 30, 2013 of DFT and the Operating Partnership. DFT is a real estate investment trust and the general partner of the Operating Partnership. The Operating Partnership’s capital includes general and limited common operating partnership units, or “OP units.” As the sole general partner of the Operating Partnership, DFT has exclusive control of the Operating Partnership’s day-to-day management.
	The Company believes combining the quarterly reports on Form 10-Q of DFT and the Operating Partnership into this single report provides the following benefits:
	•	enhances investors’ understanding of DFT and the Operating Partnership by enabling investors to view the business as a whole in the same manner as management views and operates the business;
	•	eliminates duplicative disclosure and provides a more streamlined and readable presentation since a substantial portion of the disclosure in this report applies to both DFT and the Operating Partnership; and
	•	creates time and cost efficiencies through the preparation of one combined report instead of two separate reports.
	Management operates DFT and the Operating Partnership as one business. The management of DFT consists of the same employees as the management of the Operating Partnership.
	The Company believes it is important for investors to understand the few differences between DFT and the Operating Partnership in the context of how DFT and the Operating Partnership operate as a consolidated company. DFT is a REIT, whose only material asset is its ownership of OP units of the Operating Partnership. As a result, DFT does not conduct business itself, other than acting as the sole general partner of the Operating Partnership, issuing public equity from time to time and guaranteeing unsecured debt of the Operating Partnership. DFT has not issued any indebtedness, but has guaranteed all of the unsecured debt of the Operating Partnership. The Operating Partnership holds all the real estate assets of the Company. Except for net proceeds from public equity issuances by DFT, which are contributed to the Operating Partnership in exchange for OP units or preferred units, the Operating Partnership generates all remaining capital required by the Company’s business. These sources include the Operating Partnership’s operations, its direct or indirect incurrence of indebtedness, and the issuance of partnership units.
	As general partner with control of the Operating Partnership, DFT consolidates the Operating Partnership for financial reporting purposes. The presentation of stockholders’ equity and partners’ capital are the main areas of difference between the consolidated financial statements of DFT and those of the Operating Partnership. The Operating Partnership’s capital includes preferred units and general and limited common units that are owned by DFT and the other partners. DFT’s stockholders’ equity includes preferred stock, common stock, additional paid in capital and retained earnings (accumulated deficit). The common limited partnership interests held by the limited partners (other than DFT) in the Operating Partnership are presented as “redeemable partnership units” in the Operating Partnership’s consolidated financial statements and as “redeemable noncontrolling interests-operating partnership” in DFT’s consolidated financial statements. The only difference between the assets and liabilities of DFT and the Operating Partnership as of September 30, 2013 is a $4.3 million bank account held by DFT that is not part of the Operating Partnership. Net income is the same for DFT and the Operating Partnership.
	The accompanying unaudited consolidated financial statements have been prepared by management in accordance with U.S. generally accepted accounting principles, or GAAP, for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, these consolidated financial statements do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. All significant intercompany accounts and transactions have been eliminated in the consolidated financial statements. The results of operations for the three and nine months ended September 30, 2013 are not necessarily indicative of the results that may be expected for the full year. These consolidated financial statements should be read in conjunction with Management’s Discussion and Analysis of Financial Condition and Results of Operations contained elsewhere in this Form 10-Q and the audited financial statements and accompanying notes for the year ended December 31, 2012 contained in the Company’s Form 10-K, which contains a complete listing of the Company’s significant accounting policies.
	The Company has one reportable segment consisting of investments in data centers located in the United States. All of the Company's properties generate similar types of revenues and expenses related to tenant rent and reimbursements and operating expenses. The delivery of the Company's products is consistent across all properties and although services are provided to a range of customers, the types of services provided to them are limited to a few core principles. As such, the properties in the Company's portfolio have similar economic characteristics and the nature of the products and services provided to the Company's customers and the method to distribute such services are consistent throughout the portfolio.
Use of Estimates [Policy Text Block]	Use of Estimates
	The preparation of financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosures of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenue and expenses during the reporting period. Actual results could differ from those estimates.
Property [Policy Text Block]	Property
	Depreciation on buildings is generally provided on a straight-line basis over 40 years from the date the buildings were placed in service. Building components are depreciated over the life of the respective improvement ranging from 10 to 40 years from the date the components were placed in service. Personal property is depreciated over three years to seven years. Depreciation expense was $22.2 million and $21.3 million for the three months ended September 30, 2013 and 2012, respectively, and $66.4 million and $63.3 million for the nine months ended September 30, 2013 and 2012, respectively. Included in these amounts is amortization expense related to tenant origination costs, which was $0.8 million for each of the three months ended September 30, 2013 and 2012, respectively, and $2.4 million for each of the nine months ended September 30, 2013 and 2012, respectively. Repairs and maintenance costs are expensed as incurred.
	The Company records impairment losses on long-lived assets used in operations or in development when events or changes in circumstances indicate that the assets might be impaired, and the estimated undiscounted cash flows to be generated by those assets are less than the carrying amounts. If circumstances indicating impairment of a long-lived asset are present, the Company would determine the fair value of that asset, and an impairment loss would be recognized in an amount equal to the excess of the carrying amount of the impaired asset over its fair value. Management assesses the recoverability of the carrying value of its assets on a property-by-property basis. No impairment losses were recorded during the nine months ended September 30, 2013 and 2012.
Deferred Costs [Policy Text Block]	Deferred Costs
	Deferred costs, net on the Company’s consolidated balance sheets include both financing and leasing costs.
	Financing costs, which represent fees and other costs incurred in obtaining debt, are amortized using the effective-interest rate method or a method that approximates the effective-interest method, over the term of the loan and are included in amortization of deferred financing costs. In March 2013, the Company paid off the $138.3 million balance of the ACC5 Term Loan that resulted in a write-off of $1.7 million of unamortized deferred financing costs. In September 2013, the Company issued $600 million of Unsecured Notes due 2021 (see Note 4) and incurred financing costs of $13.4 million. Also, in September 2013, the Company paid off $418.1 million of the tendered Unsecured Notes Due 2017 (See Note 4) that resulted in a write off of $5.1 million of unamortized deferred financing costs. Balances, net of accumulated amortization, at September 30, 2013 and December 31, 2012 are as follows (in thousands):
		September 30,				December 31,
		2013				2012
	Financing costs	$	25,988			$	23,082
	Accumulated amortization	(4,849		)		(10,531		)
	Financing costs, net	$	21,139			$	12,551
	Leasing costs, which are either external fees and costs incurred in the successful negotiations of leases, internal costs expended in the successful negotiations of leases or the estimated leasing commissions resulting from the allocation of the purchase price of ACC2, VA3, VA4 and ACC4, are deferred and amortized over the terms of the related leases on a straight-line basis. If an applicable lease terminates prior to the expiration of its initial term, the carrying amount of the costs are written off to amortization expense. The Company incurred leasing costs of $1.9 million and $0.1 million for the three months ended September 30, 2013 and 2012, respectively, and $2.1 million and $0.9 million for the nine months ended September 30, 2013 and 2012, respectively. Amortization of deferred leasing costs totaled $1.2 million and $1.1 million for the three months ended September 30, 2013 and 2012, respectively, and $3.1 million and $3.3 million for the nine months ended September 30, 2013 and 2012, respectively. Balances, net of accumulated amortization, at September 30, 2013 and December 31, 2012 are as follows (in thousands):
		September 30,				December 31,
		2013				2012
	Leasing costs	$	48,362			$	46,719
	Accumulated amortization	(26,193		)		(23,600		)
	Leasing costs, net	$	22,169			$	23,119
Inventory [Policy Text Block]	Inventory
	The Company maintains fuel inventory for its generators, which is recorded at the lower of cost (on a first-in, first-out basis) or market. As of September 30, 2013 and December 31, 2012, the fuel inventory was $3.9 million and $3.0 million, respectively, and is included in prepaid expenses and other assets in the accompanying consolidated balance sheets.
Rental Income [Policy Text Block]	Rental Income
	The Company, as a lessor, has retained substantially all the risks and benefits of ownership and accounts for its leases as operating leases. For lease agreements that provide for scheduled fixed and determinable rent increases, rental income is recognized on a straight-line basis over the non-cancellable term of the leases, which commences when control of the space and critical power have been provided to the tenant. If the lease contains an early termination clause with a penalty payment, the Company determines the lease termination date by evaluating whether the penalty reasonably assures that the lease will not be terminated early. Lease inducements, which include free rent or cash payments to tenants, are amortized as a reduction of rental income over the non-cancellable lease term. Straight-line rents receivable are included in deferred rent on the consolidated balance sheets. Lease intangible assets and liabilities that have resulted from above-market and below-market leases that were acquired are amortized on a straight-line basis as decreases and increases, respectively, to rental revenue over the remaining non-cancellable term of the underlying leases. If a lease terminates prior to the expiration of its initial term, the unamortized portion of lease intangibles associated with that lease will be written off to rental revenue. Balances, net of accumulated amortization, at September 30, 2013 and December 31, 2012 are as follows (in thousands):
		September 30,				December 31,
		2013				2012
	Lease contracts above market value	$	23,100			$	23,100
	Accumulated amortization	(13,671		)		(12,845		)
	Lease contracts above market value, net	$	9,429			$	10,255
	Lease contracts below market value	$	39,375			$	39,375
	Accumulated amortization	(27,972		)		(25,353		)
	Lease contracts below market value, net	$	11,403			$	14,022
	The Company’s policy is to record a reserve for losses on accounts receivable equal to the estimated uncollectible
	accounts. The estimate is based on management’s historical experience and a review of the current status of the Company’s
	receivables. As of September 30, 2013 and December 31, 2012, the Company had reserves against rents and other receivables of $1.4 million and $0.9 million, respectively. The Company also establishes an appropriate allowance for doubtful accounts for receivables arising from the straight-lining of rents. These receivables arise from revenue recognized in excess of amounts currently due under the lease and are recorded as deferred rent in the accompanying balance sheets. As of September 30, 2013 and December 31, 2012, the Company had reserves against deferred rent of $2.1 million.
	The reserves described above were set up for one tenant that restructured its lease obligations with the Company. Under this restructuring, this tenant's outstanding accounts receivable and deferred rent receivable related to the returned space was converted into a note receivable, the terms of which require the payment of principal and interest through December 31, 2016. Principal payments on the note are calculated on a ten-year amortization schedule with a final principal payment of the remaining note balance due on December 31, 2016. Additionally, under this restructuring this tenant has the right to defer up to two-thirds of base rent due through July 2014 at NJ1 in Piscataway, New Jersey. Any base rent deferred is added to the note. The note balance on the accompanying balance sheet as of September 30, 2013 was $5.5 million.
	Tenant leases generally contain provisions under which the tenants reimburse the Company for a portion of operating expenses and real estate taxes incurred by the property. Recoveries from tenants are included in revenue in the consolidated statements of operations in the period the applicable expenditures are incurred. Recoveries from tenants also include the property management fees that the Company earns from its tenants.
Other Revenue [Policy Text Block]	Other Revenue
	Other revenue primarily consists of services provided to tenants on a non-recurring basis. This includes projects such as the purchase and installation of circuits, racks, breakers and other tenant requested items. Revenue is recognized on a completed contract basis. Costs of providing these services are included in other expenses in the accompanying consolidated statements of operations.
Redeemable Noncontrolling Interests—Operating Partnership / Redeemable Partnership Units [Policy Text Block]	Redeemable Noncontrolling Interests – Operating Partnership / Redeemable Partnership Units
	Redeemable noncontrolling interests – operating partnership, as presented on DFT’s consolidated balance sheets, represent the limited partnership interests in the Operating Partnership (“OP units”) held by individuals and entities other than DFT. These interests are also presented on the Operating Partnership’s consolidated balance sheets, referred to as “redeemable partnership units.” Accordingly, the following discussion related to redeemable noncontrolling interests – operating partnership of the REIT refers equally to redeemable partnership units of the Operating Partnership.
	Redeemable noncontrolling interests – operating partnership, which require cash payment, or allow settlement in shares, but with the ability to deliver the shares outside of the control of DFT, are reported outside of the permanent equity section of the consolidated balance sheets of DFT and the Operating Partnership. Redeemable noncontrolling interests – operating partnership are adjusted for income, losses and distributions allocated to OP units not held by DFT (normal noncontrolling interest accounting amount). Adjustments to redeemable noncontrolling interests – operating partnership are recorded to reflect increases or decreases in the ownership of the Operating Partnership by holders of OP units, including the redemptions of OP units for cash or in exchange for shares of DFT’s common stock. If such adjustments result in redeemable noncontrolling interests – operating partnership being recorded at less than the redemption value of the OP units, redeemable noncontrolling interests – operating partnership are further adjusted to their redemption value (see Note 6). Redeemable noncontrolling interests – operating partnership are recorded at the greater of the normal noncontrolling interest accounting amount or redemption value. The following is a summary of activity for redeemable noncontrolling interests – operating partnership for the nine months ended September 30, 2013 (dollars in thousands):
		OP Units
		Number			Amount
	Balance at December 31, 2012	18,786,806			$	453,889
	Net income attributable to redeemable noncontrolling interests – operating partnership	—			2,397
	Distributions declared	—			(11,132		)
	Redemption of operating partnership units	(2,904,769	)		(70,200		)
	Adjustments to redeemable noncontrolling interests – operating partnership	—			34,326
	Balance at September 30, 2013	15,882,037			$	409,280
	The following is a summary of activity for redeemable partnership units for the nine months ended September 30, 2013 (dollars in thousands):
		OP Units
		Number			Amount
	Balance at December 31, 2012	18,786,806			$	453,889
	Redemption of operating partnership units	(2,904,769	)		(70,200		)
	Adjustments to redeemable partnership units	—			25,591
	Balance at September 30, 2013	15,882,037			$	409,280
	Net (loss) income is allocated to controlling interests and redeemable noncontrolling interests – operating partnership in accordance with the limited partnership agreement of the Operating Partnership. The following is a summary of net (loss) income attributable to controlling interests and transfers to redeemable noncontrolling interests – operating partnership for the three and nine months ended September 30, 2013 and 2012 (dollars in thousands):
		Three months ended September 30,							Nine months ended September 30,
		2013				2012			2013		2012
	Net (loss) income attributable to controlling interests	$	(3,417	)		$	14,097		$	30,119	$	39,373
	Transfers from noncontrolling interests:
	Net change in the Company’s common stock and additional paid in capital due to the redemption of OP units and other adjustments to redeemable noncontrolling interests – operating partnership	(31,915		)		61,690			35,874		(15,943		)
		$	(35,332	)		$	75,787		$	65,993	$	23,430
Earnings Per Share of the REIT [Policy Text Block]	Earnings (Loss) Per Share of the REIT
	Basic earnings (loss) per share is calculated by dividing the net income (loss) attributable to common shares for the period by the weighted average number of common shares outstanding during the period using the two class method. Diluted earnings (loss) per share is calculated by dividing the net income (loss) attributable to common shares for the period by the weighted average number of common and dilutive securities outstanding during the period.
Earnings Per Unit of the Operating Partnership [Policy Text Block]	Earnings (Loss) Per Unit of the Operating Partnership
	Basic earnings (loss) per unit is calculated by dividing the net income (loss) attributable to common units for the period by the weighted average number of common units outstanding during the period using the two class method. Diluted earnings (loss) per unit is calculated by dividing the net income (loss) attributable to common units for the period by the weighted average number of common and dilutive securities outstanding during the period.
Stock-based Compensation [Policy Text Block]	Stock-based Compensation
	DFT awards stock-based compensation to employees and members of its Board of Directors in the form of common stock. For each stock award granted by DFT, the OP issues an equivalent common unit, which may be referred to herein as a common share, common stock, or common unit. The Company estimates the fair value of the awards and recognizes this value over the requisite vesting period. The fair value of restricted stock-based compensation is based on the market value of DFT’s common stock on the date of the grant. The fair value of options to purchase common stock is based on the Black-Scholes model. The fair value of performance units is based on a Monte Carlo simulation.
Reclassification, Policy [Policy Text Block]	Reclassifications
	Certain amounts from the prior year have been reclassified for consistency with the current year presentation.

2_Significant_Accounting_Polic2

2. Significant Accounting Policies (Tables)	9 Months Ended
	Sep. 30, 2013
Accounting Policies [Abstract]
Schedule of Deferred Financing Costs [Table Text Block]	Balances, net of accumulated amortization, at September 30, 2013 and December 31, 2012 are as follows (in thousands):
		September 30,				December 31,
		2013				2012
	Financing costs	$	25,988			$	23,082
	Accumulated amortization	(4,849		)		(10,531		)
	Financing costs, net	$	21,139			$	12,551
Schedule of Deferred Leasing Costs [Table Text Block]	Balances, net of accumulated amortization, at September 30, 2013 and December 31, 2012 are as follows (in thousands):
		September 30,				December 31,
		2013				2012
	Leasing costs	$	48,362			$	46,719
	Accumulated amortization	(26,193		)		(23,600		)
	Leasing costs, net	$	22,169			$	23,119
Schedule of Lease Intangibles Above and Below Market Value [Table Text Block]	Balances, net of accumulated amortization, at September 30, 2013 and December 31, 2012 are as follows (in thousands):
		September 30,				December 31,
		2013				2012
	Lease contracts above market value	$	23,100			$	23,100
	Accumulated amortization	(13,671		)		(12,845		)
	Lease contracts above market value, net	$	9,429			$	10,255
	Lease contracts below market value	$	39,375			$	39,375
	Accumulated amortization	(27,972		)		(25,353		)
	Lease contracts below market value, net	$	11,403			$	14,022
Redeemable Noncontrolling Interest [Table Text Block]	The following is a summary of activity for redeemable noncontrolling interests – operating partnership for the nine months ended September 30, 2013 (dollars in thousands):
		OP Units
		Number			Amount
	Balance at December 31, 2012	18,786,806			$	453,889
	Net income attributable to redeemable noncontrolling interests – operating partnership	—			2,397
	Distributions declared	—			(11,132		)
	Redemption of operating partnership units	(2,904,769	)		(70,200		)
	Adjustments to redeemable noncontrolling interests – operating partnership	—			34,326
	Balance at September 30, 2013	15,882,037			$	409,280
Redeemable Partnership Units [Table Text Block]	The following is a summary of activity for redeemable partnership units for the nine months ended September 30, 2013 (dollars in thousands):
		OP Units
		Number			Amount
	Balance at December 31, 2012	18,786,806			$	453,889
	Redemption of operating partnership units	(2,904,769	)		(70,200		)
	Adjustments to redeemable partnership units	—			25,591
	Balance at September 30, 2013	15,882,037			$	409,280
Schedule of Net Income Attributable to Controlling Interests and Transfers From Redeemable Noncontrolling Interests Operating Partnership [Table Text Block]	The following is a summary of net (loss) income attributable to controlling interests and transfers to redeemable noncontrolling interests – operating partnership for the three and nine months ended September 30, 2013 and 2012 (dollars in thousands):
		Three months ended September 30,							Nine months ended September 30,
		2013				2012			2013		2012
	Net (loss) income attributable to controlling interests	$	(3,417	)		$	14,097		$	30,119	$	39,373
	Transfers from noncontrolling interests:
	Net change in the Company’s common stock and additional paid in capital due to the redemption of OP units and other adjustments to redeemable noncontrolling interests – operating partnership	(31,915		)		61,690			35,874		(15,943		)
		$	(35,332	)		$	75,787		$	65,993	$	23,430

3_Real_Estate_Assets_Tables

3. Real Estate Assets (Tables)	9 Months Ended
	Sep. 30, 2013
Real Estate [Abstract]
Schedule of Real Estate Properties [Table Text Block]	The following is a summary of properties owned by the Company at September 30, 2013 (dollars in thousands):
	Property	Location		Land		Buildings and		Construction		Total Cost
						Improvements		in Progress
								and Land Held
								for
								Development
	ACC2	Ashburn, VA		$	2,500	$	159,093	$	—	$	161,593
	ACC3	Ashburn, VA		1,071		95,608		—		96,679
	ACC4	Ashburn, VA		6,600		538,090		—		544,690
	ACC5	Ashburn, VA		6,443		297,862		—		304,305
	ACC6	Ashburn, VA		5,518		215,220		—		220,738
	VA3	Reston, VA		9,000		177,489		—		186,489
	VA4	Bristow, VA		6,800		148,481		—		155,281
	CH1	Elk Grove Village, IL		23,611		358,403		—		382,014
	NJ1 Phase I	Piscataway, NJ		4,311		208,798		—		213,109
	SC1 Phase I	Santa Clara, CA		10,102		221,079		—		231,181
				75,956		2,420,123		—		2,496,079
	Construction in progress and land held for development	(1	)	—		—		197,400		197,400
				$	75,956	$	2,420,123	$	197,400	$	2,693,479
	-1	Properties located in Ashburn, VA (ACC7 and ACC8); Piscataway, NJ (NJ1 Phase II), Elk Grove Village, IL (CH2) and Santa Clara, CA (SC1 Phase

4_Debt_Tables

4. Debt (Tables)	9 Months Ended
	Sep. 30, 2013
Debt Instrument [Line Items]
Schedule of Debt [Table Text Block]	Debt Summary as of September 30, 2013 and December 31, 2012
	($ in thousands)
		September 30, 2013													December 31, 2012
		Amounts				% of Total			Rates			Maturities			Amounts
												(years)
	Secured	$	115,000			12	%		2	%		4.5			$	139,600
	Unsecured	851,889				88	%		5.7	%		6.4			568,000
	Total	$	966,889			100	%		5.3	%		6.2			$	707,600
	Fixed Rate Debt:
	Unsecured Notes due 2021	$	600,000			62	%		5.9	%		8			$	—
	Unsecured Notes due 2017	131,889				14	%		8.5	%		0.1			550,000
	Fixed Rate Debt	731,889				76	%		6.3	%		6.5			550,000
	Floating Rate Debt:
	Unsecured Credit Facility	—				—			—			2.5			18,000
	Unsecured Term Loan	120,000				12	%		1.9	%		5.4			—
	ACC3 Term Loan	115,000				12	%		2	%		4.5			—
	ACC5 Term Loan	—				—			—			—			139,600
	Floating Rate Debt	235,000				24	%		2	%		4.9			157,600
	Total	$	966,889			100	%		5.3	%		6.2			$	707,600
	Note:	The Company capitalized interest and deferred financing cost amortization of $1.1 million and $1.6 million during the three and nine months ended September 30, 2013, respectively.
Schedule Of Term Loan Interest Rate Margin Applicable By Indebtedness Level [Table Text Block] [Table Text Block]
					Applicable Margin
	Pricing Level		Ratio of Total Indebtedness to Gross Asset Value		LIBOR Rate Loans			Base Rate Loans
	Level 1		Less than or equal to 35%		1.75	%		0.75	%
	Level 2		Greater than 35% but less than or equal to 40%		1.9	%		0.9	%
	Level 3		Greater than 40% but less than or equal to 45%		2.05	%		1.05	%
	Level 4		Greater than 45% but less than or equal to 52.5%		2.2	%		1.2	%
	Level 5		Greater than 52.5%		2.4	%		1.4	%
Schedule Of Credit Rating For Unsecured Term Loan [Table Text Block] [Table Text Block]
					Applicable Margin
	Credit Rating Level		Credit Rating		LIBOR Rate Loans			Base Rate Loans
	Level 1		Greater than or equal to A- by S&P or A3 by Moody’s		0.95	%		0	%
	Level 2		Greater than or equal to BBB+ by S&P or Baa1 by Moody’s		1.05	%		0.05	%
	Level 3		Greater than or equal to BBB by S&P or Baa2 by Moody’s		1.2	%		0.2	%
	Level 4		Greater than or equal to BBB- by S&P or Baa3 by Moody’s		1.5	%		0.5	%
	Level 5		Less than BBB- by S&P or Baa3 by Moody’s		1.95	%		0.95	%
Summary Of Maturities And Percentage Of Redemption Price Of Unsecures Notes [Table Text Block]
	Year	Redemption Price
	2016	104.406	%
	2017	102.938	%
	2018	101.469	%
	2019 and thereafter	100	%
Schedule Of Interest Rate Margin Applicable By Indebtedness Level [Table Text Block]
					Applicable Margin
	Pricing Level		Ratio of Total Indebtedness to Gross Asset Value		LIBOR Rate Loans			Base Rate Loans
	Level 1		Less than or equal to 35%		1.85	%		0.85	%
	Level 2		Greater than 35% but less than or equal to 40%		2	%		1	%
	Level 3		Greater than 40% but less than or equal to 45%		2.15	%		1.15	%
	Level 4		Greater than 45% but less than or equal to 52.5%		2.3	%		1.3	%
	Level 5		Greater than 52.5%		2.5	%		1.5	%
Schedule Of Credit Rating Of Unsecured Notes [Table Text Block]
					Applicable Margin
	Credit Rating Level		Credit Rating		LIBOR Rate Loans			Base Rate Loans
	Level 1		Greater than or equal to A- by S&P or A3 by Moody’s		1.05	%		0.05	%
	Level 2		Greater than or equal to BBB+ by S&P or Baa1 by Moody’s		1.2	%		0.2	%
	Level 3		Greater than or equal to BBB by S&P or Baa2 by Moody’s		1.35	%		0.35	%
	Level 4		Greater than or equal to BBB- by S&P or Baa3 by Moody’s		1.5	%		0.5	%
	Level 5		Less than BBB- by S&P or Baa3 by Moody’s		2.1	%		1.1	%
Schedule of Maturities of Long-term Debt [Table Text Block]	A summary of the Company’s debt maturity schedule as of September 30, 2013 is as follows:
	Debt Maturity as of September 30, 2013
	($ in thousands)
	Year		Fixed Rate					Floating Rate					Total				% of Total		Rates
	2013		$	131,889		-1		$	—				$	131,889			13.6	%	8.5	%
	2014		—					—					—				—		—
	2015		—					—					—				—		—
	2016		—					3,750			-3		3,750				0.4	%	2	%
	2017		—					8,750			-3		8,750				0.9	%	2	%
	2018		—					102,500			-3		102,500				10.6	%	2	%
	2019		—					120,000			-4		120,000				12.4	%	1.9	%
	2020		—					—					—				—		—
	2021		600,000			-2		—					600,000				62.1	%	5.9	%
	Total		$	731,889				$	235,000				$	966,889			100	%	5.3	%
	-1	The remaining Unsecured Notes due 2017 were irrevocably called on September 24, 2013 and were redeemed on October 24, 2013.
	-2	The 5.875% Unsecured Notes due 2021 were issued in September 2013.
	-3	The ACC3 Term Loan matures on March 27, 2018 with no extension option. Quarterly principal payments of $1.25 million begin on April 1, 2016, increase to $2.5 million on April 1, 2017 and continue through maturity.
	-4	The Unsecured Term Loan matures on February 15, 2019 with no extension option. In October 2013, the Company exercised the accordion feature, increasing this loan to $250 million and drawing an additional $34.0 million. The remaining balance of $96.0 million must be drawn by January 10, 2014.

9_Equity_Compensation_Plan_Tab

9. Equity Compensation Plan (Tables)	9 Months Ended
	Sep. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Unvested Restricted Stock Units Roll Forward [Table Text Block]	The following table sets forth the number of unvested shares of restricted stock and the weighted average fair value of these shares at the date of grant:
		Shares of			Weighted Average
		Restricted Stock			Fair Value at
					Date of Grant
	Unvested balance at December 31, 2012	297,919			$	22.31
	Granted	139,963			$	22.78
	Vested	(158,521	)		$	21.71
	Forfeited	(7,203	)		$	22.77
	Unvested balance at September 30, 2013	272,158			$	22.89
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]	A summary of the Company’s stock option activity under the applicable equity incentive plan for the nine months ended September 30, 2013 is presented in the tables below.
		Number of			Weighted Average
		Options			Exercise Price
	Under option, December 31, 2012	2,076,781			$	15.17
	Granted	374,214			$	22.62
	Exercised	(12,000	)		$	5.06
	Forfeited	—			$	—
	Under option, September 30, 2013	2,438,995			$	16.37
		Shares Subject			Total Unearned			Weighted Average		Weighted Average
		to Option			Compensation			Vesting Period		Remaining
										Contractual Term
	As of September 30, 2013	2,438,995			$	2.9	million	1.0 year		7.0 years
Schedule of Stock Options Roll Forward [Table Text Block]	The following table sets forth the number of unvested options as of September 30, 2013 and the weighted average fair value of these options at the grant date.
		Number of			Weighted Average
		Options			Fair Value
					at Date of Grant
	Unvested balance at December 31, 2012	809,991			$	6.96
	Granted	374,214			$	4.75
	Vested	(399,481	)		$	7.34
	Forfeited	—			$	—
	Unvested balance at September 30, 2013	784,724			$	5.71
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable [Table Text Block]	The following tables sets forth the number of exercisable options as of September 30, 2013 and the weighted average fair value and exercise price of these options at the grant date.
		Number of			Weighted Average
		Options			Fair Value
					at Date of Grant
	Options Exercisable at December 31, 2012	1,266,790			$	3.52
	Vested	399,481			$	7.34
	Exercised	(12,000	)		$	1.48
	Options Exercisable at September 30, 2013	1,654,271			$	4.46
		Exercisable			Intrinsic Value			Weighted Average			Weighted Average
		Options						Exercise Price			Remaining
											Contractual Term
	As of September 30, 2013	1,654,271			$	20.7	million	$	13.26		6.3 years
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]	The following table summarizes the assumptions used to value the stock options granted and the fair value of these options granted during the nine months ended September 30, 2013.
		Assumption
	Number of options granted	374,214
	Exercise price	$	22.62
	Expected term (in years)	5
	Expected volatility	34		%
	Expected annual dividend	4		%
	Risk-free rate	0.83		%
	Fair value at date of grant	$1.8 million
Schedule of Share-based Payment Award, Performance Units, Valuation Assumptions [Table Text Block]	The following table summarizes the assumptions used to value, and the resulting fair and maximum values of, the performance units granted during the nine months ended September 30, 2013.
		Assumption
	Number of performance units granted	60,468
	Expected volatility	33		%
	Expected annual dividend	4		%
	Risk-free rate	0.4		%
	Performance unit fair value at date of grant	$	25.59
	Total grant fair value at date of grant	$1.5 million
	Maximum value of grant on vesting date based on closing price of DFT's stock at the date of grant	$4.1 million

10_Earnings_Per_Share_of_the_R1

10. Earnings Per Share of the REIT (Tables)	9 Months Ended
	Sep. 30, 2013
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	The following table sets forth the reconciliation of basic and diluted average shares outstanding used in the computation of earnings per share of common stock (in thousands except for share and per share amounts):
		Three months ended September 30,							Nine months ended September 30,
		2013				2012			2013			2012
	Basic and Diluted Shares Outstanding
	Weighted average common shares – basic	64,432,010				62,994,500			64,631,772			62,820,979
	Effect of dilutive securities	—				887,163			853,658			906,152
	Weighted average common shares – diluted	64,432,010				63,881,663			65,485,430			63,727,131
	Calculation of Earnings per Share – Basic
	Net (loss) income attributable to common shares	$	(10,228	)		$	7,286		$	9,686		$	19,132
	Net income allocated to unvested restricted shares	(67		)		(45		)	(191		)	(128		)
	Net (loss) income attributable to common shares, adjusted	(10,295		)		7,241			9,495			19,004
	Weighted average common shares – basic	64,432,010				62,994,500			64,631,772			62,820,979
	(Loss) earnings per common share – basic	$	(0.16	)		$	0.11		$	0.15		$	0.3
	Calculation of Earnings per Share – Diluted
	Net (loss) income attributable to common shares	$	(10,228	)		$	7,286		$	9,686		$	19,132
	Adjustments to redeemable noncontrolling interests	(25		)		22			25			62
	Adjusted net (loss) income available to common shares	(10,253		)		7,308			9,711			19,194
	Weighted average common shares – diluted	64,432,010				63,881,663			65,485,430			63,727,131
	Loss (earnings) per common share – diluted	$	(0.16	)		$	0.11		$	0.15		$	0.3
Schedule of exclusions from diluted earnings per share/unit [Table Text Block]	The following table sets forth the amount of restricted shares, stock options and performance units that have been excluded from the calculation of diluted earnings per share as their effect would have been antidilutive (in millions):
		Three months ended September 30,						Nine months ended September 30,
		2013			2012			2013			2012
	Restricted Shares	0.3			—			—			—
	Stock Options	2.4			0.9			1.2			0.9
	Performance Units	0.1			0.1			0.1			0.1

11_Earnings_Per_Unit_of_the_Op1

11. Earnings Per Unit of the Operating Partnership (Tables)	9 Months Ended
	Sep. 30, 2013
Earnings per unit of the Operating Partnership [Line Items]
Schedule of basic and diluted units outstanding [Table Text Block]	The following table sets forth the reconciliation of basic and diluted average shares outstanding used in the computation of earnings per share of common stock (in thousands except for share and per share amounts):
		Three months ended September 30,							Nine months ended September 30,
		2013				2012			2013			2012
	Basic and Diluted Shares Outstanding
	Weighted average common shares – basic	64,432,010				62,994,500			64,631,772			62,820,979
	Effect of dilutive securities	—				887,163			853,658			906,152
	Weighted average common shares – diluted	64,432,010				63,881,663			65,485,430			63,727,131
	Calculation of Earnings per Share – Basic
	Net (loss) income attributable to common shares	$	(10,228	)		$	7,286		$	9,686		$	19,132
	Net income allocated to unvested restricted shares	(67		)		(45		)	(191		)	(128		)
	Net (loss) income attributable to common shares, adjusted	(10,295		)		7,241			9,495			19,004
	Weighted average common shares – basic	64,432,010				62,994,500			64,631,772			62,820,979
	(Loss) earnings per common share – basic	$	(0.16	)		$	0.11		$	0.15		$	0.3
	Calculation of Earnings per Share – Diluted
	Net (loss) income attributable to common shares	$	(10,228	)		$	7,286		$	9,686		$	19,132
	Adjustments to redeemable noncontrolling interests	(25		)		22			25			62
	Adjusted net (loss) income available to common shares	(10,253		)		7,308			9,711			19,194
	Weighted average common shares – diluted	64,432,010				63,881,663			65,485,430			63,727,131
	Loss (earnings) per common share – diluted	$	(0.16	)		$	0.11		$	0.15		$	0.3
Schedule of exclusions from diluted earnings per share/unit [Table Text Block]	The following table sets forth the amount of restricted shares, stock options and performance units that have been excluded from the calculation of diluted earnings per share as their effect would have been antidilutive (in millions):
		Three months ended September 30,						Nine months ended September 30,
		2013			2012			2013			2012
	Restricted Shares	0.3			—			—			—
	Stock Options	2.4			0.9			1.2			0.9
	Performance Units	0.1			0.1			0.1			0.1
DuPont Fabros Technology, L.P. [Member]
Earnings per unit of the Operating Partnership [Line Items]
Schedule of basic and diluted units outstanding [Table Text Block]	The following table sets forth the reconciliation of basic and diluted average units outstanding used in the computation of earnings per unit:
		Three months ended September 30,						Nine months ended September 30,
		2013			2012			2013			2012
	Basic and Diluted Units Outstanding
	Weighted average common units – basic (includes redeemable partnership units and units of general and limited partners)	80,321,840			81,826,688			80,626,882			81,724,511
	Effect of dilutive securities	—			887,163			853,658			906,152
	Weighted average common units – diluted	80,321,840			82,713,851			81,480,540			82,630,663
Schedule of exclusions from diluted earnings per share/unit [Table Text Block]	The following table sets forth the amount of restricted units, stock options and performance units that have been excluded from the calculation of diluted earnings per unit as their effect would have been antidilutive (in millions):
		Three months ended September 30,						Nine months ended September 30,
		2013			2012			2013			2012
	Restricted Units	0.3			—			—			—
	Stock Options	2.4			0.9			1.2			0.9
	Performance Units	0.1			0.1			0.1			0.1

13_Supplemental_Consolidating_1

13. Supplemental Consolidating Financial Data for Subsidiary Guarantors of the Unsecured Notes (Tables)	9 Months Ended
	Sep. 30, 2013
Supplemental Consolidating Financial Data for Subsidiary Guarantors of the Unsecured Notes [Abstract]
Schedule of Supplemental Consolidating Balance Sheets [Table Text Block]	DUPONT FABROS TECHNOLOGY, L.P.
	SUPPLEMENTAL CONSOLIDATING BALANCE SHEETS
	(in thousands except share data)
		September 30, 2013
		Operating			Subsidiary			Subsidiary			Eliminations			Consolidated
		Partnership			Guarantors			Non-Guarantors						Total
	ASSETS
	Income producing property:
	Land	$	—		$	74,885		$	1,071		$	—		$	75,956
	Buildings and improvements	—			2,317,597			102,526			—			2,420,123
		—			2,392,482			103,597			—			2,496,079
	Less: accumulated depreciation	—			(365,742		)	(25,662		)	—			(391,404		)
	Net income producing property	—			2,026,740			77,935			—			2,104,675
	Construction in progress and land held for development	—			111,417			85,983			—			197,400
	Net real estate	—			2,138,157			163,918			—			2,302,075
	Cash and cash equivalents	192,976			—			924			—			193,900
	Rents and other receivables	4,059			2,266			1,640			—			7,965
	Deferred rent	—			141,901			6,539			—			148,440
	Lease contracts above market value, net	—			9,429			—			—			9,429
	Deferred costs, net	19,624			17,822			5,862			—			43,308
	Investment in affiliates	2,306,880			—			—			(2,306,880		)	—
	Prepaid expenses and other assets	2,073			38,188			1,876			—			42,137
	Total assets	$	2,525,612		$	2,347,763		$	180,759		$	(2,306,880	)	$	2,747,254
	LIABILITIES AND PARTNERS’ CAPITAL
	Liabilities:
	Line of credit	$	—		$	—		$	—		$	—		$	—
	Mortgage notes payable	—			—			115,000			—			115,000
	Unsecured term loan	120,000			—			—			—			120,000
	Unsecured notes payable	731,889			—			—			—			731,889
	Accounts payable and accrued liabilities	4,698			18,760			3,219			—			26,677
	Construction costs payable	—			3,991			18,252			—			22,243
	Accrued interest payable	4,645			—			6			—			4,651
	Distribution payable	25,902			—			—			—			25,902
	Lease contracts below market value, net	—			11,403			—			—			11,403
	Prepaid rents and other liabilities	49			47,865			3,146			—			51,060
	Total liabilities	887,183			82,019			139,623			—			1,108,825
	Redeemable partnership units	409,280			—			—			—			409,280
	Commitments and contingencies	—			—			—			—			—
	Limited Partners’ Capital:
	Series A cumulative redeemable perpetual preferred units, 7,400,000 issued and outstanding at September 30, 2013	185,000			—			—			—			185,000
	Series B cumulative redeemable perpetual preferred units, 6,650,000 issued and outstanding at September 30, 2013	166,250			—			—			—			166,250
	Common units, 64,059,632 issued and outstanding at September 30, 2013	868,914			2,265,744			41,136			(2,306,880		)	868,914
	General partner’s capital, 662,373 common units issued and outstanding at September 30, 2013	8,985			—			—			—			8,985
	Total partners’ capital	1,229,149			2,265,744			41,136			(2,306,880		)	1,229,149
	Total liabilities & partners’ capital	$	2,525,612		$	2,347,763		$	180,759		$	(2,306,880	)	$	2,747,254
	DUPONT FABROS TECHNOLOGY, L.P.
	SUPPLEMENTAL CONSOLIDATING BALANCE SHEETS
	(in thousands except share data)
		December 31, 2012
		Operating			Subsidiary			Subsidiary			Eliminations			Consolidated
		Partnership			Guarantors			Non-Guarantors						Total
	ASSETS
	Income producing property:
	Land	$	—		$	72,126		$	1,071		$	—		$	73,197
	Buildings and improvements	—			2,210,314			105,185			—			2,315,499
		—			2,282,440			106,256			—			2,388,696
	Less: accumulated depreciation	—			(302,745		)	(22,995		)	—			(325,740		)
	Net income producing property	—			1,979,695			83,261			—			2,062,956
	Construction in progress and land held for development	—			204,533			14,401			—			218,934
	Net real estate	—			2,184,228			97,662			—			2,281,890
	Cash and cash equivalents	18,240			361			681			—			19,282
	Rents and other receivables	15			2,729			1,096			—			3,840
	Deferred rent	—			135,937			8,892			—			144,829
	Lease contracts above market value, net	—			10,255			—			—			10,255
Deferred costs, net	10,711			20,442			4,517			—			35,670
Investment in affiliates	2,280,723			—			—			(2,280,723		)	—
Prepaid expenses and other assets	2,101			26,877			1,819			—			30,797
Total assets	$	2,311,790		$	2,380,829		$	114,667		$	(2,280,723	)	$	2,526,563
LIABILITIES AND PARTNERS’ CAPITAL
Liabilities:
Line of credit	$	18,000		$	—		$	—		$	—		$	18,000
Mortgage notes payable	—			139,600			—			—			139,600
Unsecured notes payable	550,000			—			—			—			550,000
Accounts payable and accrued liabilities	3,240			16,312			2,728			—			22,280
Construction costs payable	5			6,100			229			—			6,334
Accrued interest payable	2,290			311			—			—			2,601
Distribution payable	22,177			—			—			—			22,177
Lease contracts below market value, net	—			14,022			—			—			14,022
Prepaid rents and other liabilities	53			32,478			2,993			—			35,524
Total liabilities	595,765			208,823			5,950			—			810,538
Redeemable partnership units	453,889			—			—			—			453,889
Commitments and contingencies	—			—			—			—			—
Limited Partners’ Capital:
Series A cumulative redeemable perpetual preferred units, 7,400,000 issued and outstanding at December 31, 2012	185,000			—			—			—			185,000
Series B cumulative redeemable perpetual preferred units, 6,650,000 issued and outstanding at December 31, 2012	166,250			—			—			—			166,250
Common units, 62,678,556 issued and outstanding at December 31, 2012	901,361			2,172,006			108,717			(2,280,723		)	901,361
General partner’s capital, 662,373 common units issued and outstanding at December 31, 2012	9,525			—			—			—			9,525
Total partners’ capital	1,262,136			2,172,006			108,717			(2,280,723		)	1,262,136
Total liabilities & partners’ capital	$	2,311,790		$	2,380,829		$	114,667		$	(2,280,723	)	$	2,526,563
Schedule of Supplemental Consolidating Statements of Operations [Table Text Block]	DUPONT FABROS TECHNOLOGY, L.P.
	SUPPLEMENTAL CONSOLIDATING STATEMENTS OF OPERATIONS
	(in thousands)
		Three months ended September 30, 2013
		Operating			Subsidiary			Subsidiary			Eliminations			Consolidated
		Partnership			Guarantors			Non-Guarantors						Total
	Revenues:
	Base rent	$	—		$	59,343		$	3,976		$	(38	)	$	63,281
	Recoveries from tenants	3,940			28,776			2,911			(3,940		)	31,687
	Other revenues	—			382			1,037			(45		)	1,374
	Total revenues	3,940			88,501			7,924			(4,023		)	96,342
	Expenses:
	Property operating costs	—			28,314			2,790			(3,985		)	27,119
	Real estate taxes and insurance	—			3,480			150			—			3,630
	Depreciation and amortization	18			22,380			1,140			—			23,538
	General and administrative	3,534			21			109			—			3,664
	Other expenses	161			—			751			(38		)	874
	Total expenses	3,713			54,195			4,940			(4,023		)	58,825
	Operating income	227			34,306			2,984			—			37,517
	Interest income	32			—			—			—			32
	Interest:
	Expense incurred	(12,467		)	420			(1		)	—			(12,048		)
	Amortization of deferred financing costs	(820		)	22			(51		)	—			(849		)
	Loss on early extinguishment of debt	(30,610		)	—			—			—			(30,610		)
	Equity in earnings	37,680			—			—			(37,680		)	—
	Net (loss) income	(5,958		)	34,748			2,932			(37,680		)	(5,958		)
	Preferred unit distributions	(6,811		)	—			—			—			(6,811		)
	Net (loss) income attributable to common units	$	(12,769	)	$	34,748		$	2,932		$	(37,680	)	$	(12,769	)
		Three months ended September 30, 2012
		Operating			Subsidiary			Subsidiary			Eliminations			Consolidated
		Partnership			Guarantors			Non-Guarantors						Total
	Revenues:
	Base rent	$	—		$	52,188		$	4,491		$	(38	)	$	56,641
	Recoveries from tenants	3,517			24,519			3,240			(3,517		)	27,759
	Other revenues	—			305			786			(45		)	1,046
	Total revenues	3,517			77,012			8,517			(3,600		)	85,446
	Expenses:
	Property operating costs	—			24,968			3,118			(3,562		)	24,524
	Real estate taxes and insurance	—			4,491			140			—			4,631
	Depreciation and amortization	28			21,154			1,349			—			22,531
	General and administrative	3,406			21			546			—			3,973
	Other expenses	119			—			653			(38		)	734
	Total expenses	3,553			50,634			5,806			(3,600		)	56,393
	Operating (loss) income	(36		)	26,378			2,711			—			29,053
	Interest income	109			—			—			(76		)	33
	Interest:
	Expense incurred	(11,889		)	(45		)	(76		)	76			(11,934		)
	Amortization of deferred financing costs	(682		)	(192		)	—			—			(874		)
	Equity in earnings	28,776			—			—			(28,776		)	—
	Net income (loss)	16,278			26,141			2,635			(28,776		)	16,278
	Preferred unit distributions	(6,811		)	—			—			—			(6,811		)
	Net income (loss) attributable to common units	$	9,467		$	26,141		$	2,635		$	(28,776	)	$	9,467
		Nine months ended September 30, 2013
		Operating			Subsidiary			Subsidiary			Eliminations			Consolidated
		Partnership			Guarantors			Non-Guarantors						Total
	Revenues:
	Base rent	$	—		$	173,651		$	11,936		$	(113	)	$	185,474
	Recoveries from tenants	11,317			79,315			7,758			(11,317		)	87,073
	Other revenues	—			1,191			2,046			(119		)	3,118
	Total revenues	11,317			254,157			21,740			(11,549		)	275,665
	Expenses:
	Property operating costs	—			79,433			7,401			(11,436		)	75,398
	Real estate taxes and insurance	—			10,572			372			—			10,944
	Depreciation and amortization	64			66,424			3,285			—			69,773
General and administrative	12,039			78			429			—			12,546
Other expenses	600			296			1,448			(113		)	2,231
Total expenses	12,703			156,803			12,935			(11,549		)	170,892
Operating (loss) income	(1,386		)	97,354			8,805			—			104,773
Interest income	(200		)	20			—			265			85
Interest:
Expense incurred	(36,731		)	(595		)	101			(265		)	(37,490		)
Amortization of deferred financing costs	(2,206		)	(222		)	(114		)	—			(2,542		)
Loss on early extinguishment of debt	(30,610		)	(1,700		)	—			—			(32,310		)
Equity in earnings	103,649			—			—			(103,649		)	—
Net income (loss)	32,516			94,857			8,792			(103,649		)	32,516
Preferred unit distributions	(20,433		)	—			—			—			(20,433		)
Net (loss) income attributable to common units	$	12,083		$	94,857		$	8,792		$	(103,649	)	$	12,083
	Nine months ended September 30, 2012
	Operating			Subsidiary			Subsidiary			Eliminations			Consolidated
	Partnership			Guarantors			Non-Guarantors						Total
Revenues:
Base rent	$	—		$	152,222		$	13,475		$	(113	)	$	165,584
Recoveries from tenants	10,226			68,348			9,225			(10,226		)	77,573
Other revenues	—			903			2,537			(111		)	3,329
Total revenues	10,226			221,473			25,237			(10,450		)	246,486
Expenses:
Property operating costs	—			71,827			8,870			(10,337		)	70,360
Real estate taxes and insurance	—			8,800			415			—			9,215
Depreciation and amortization	90			62,757			4,038			—			66,885
General and administrative	11,807			97			1,810			—			13,714
Other expenses	135			—			2,124			(113		)	2,146
Total expenses	12,032			143,481			17,257			(10,450		)	162,320
Operating (loss) income	(1,806		)	77,992			7,980			—			84,166
Interest income	299			—			—			(187		)	112
Interest:
Expense incurred	(35,608		)	(863		)	(187		)	187			(36,471		)
Amortization of deferred financing costs	(2,069		)	(608		)	—			—			(2,677		)
Equity in earnings	84,314			—			—			(84,314		)	—
Net income (loss)	45,130			76,521			7,793			(84,314		)	45,130
Preferred unit distributions	(20,241		)	—			—			—			(20,241		)
Net income (loss) attributable to common units	$	24,889		$	76,521		$	7,793		$	(84,314	)	$	24,889
Schedule of Supplemental Consolidating Statements Of Cash Flows [Table Text Block]	DUPONT FABROS TECHNOLOGY, L.P.
	SUPPLEMENTAL CONSOLIDATING STATEMENTS OF CASH FLOWS
	(in thousands)
		Nine months ended September 30, 2013
		Operating			Subsidiary			Subsidiary			Eliminations			Consolidated
		Partnership			Guarantors			Non-Guarantors						Total
	Cash flow from operating activities
	Net cash (used in) provided by operating activities	$	(36,793	)	$	165,509		$	11,934		$	—		$	140,650
	Cash flow from investing activities
	Investments in real estate – development	(8		)	(27,469		)	(22,687		)	—			(50,164		)
	Land acquisition costs	—			—			(14,186		)	—			(14,186		)
	Investments in affiliates	80,340			6,545			(86,885		)	—			—
	Interest capitalized for real estate under development	—			(453		)	(1,069		)	—			(1,522		)
	Improvements to real estate	—			(4,871		)	(164		)	—			(5,035		)
	Additions to non-real estate property	(6		)	(18		)	—			—			(24		)
	Net cash provided by (used in) investing activities	80,326			(26,266		)	(124,991		)	—			(70,931		)
	Cash flow from financing activities
	Line of credit:
	Proceeds	102,000			—			—			—			102,000
	Repayments	(120,000		)	—			—			—			(120,000		)
	Mortgage notes payable:
	Proceeds	—			—			115,000			—			115,000
	Lump sum payoffs	—			(138,300		)	—			—			(138,300		)
	Repayments	—			(1,300		)	—			—			(1,300		)
	Unsecured term loan:
	Proceeds	120,000			—			—			—			120,000
	Unsecured notes payable:
	Proceeds	600,000			—			—			—			600,000
	Repayments	(418,111		)	—			—			—			(418,111		)
	Payments of financing costs	(16,369		)	(4		)	(1,700		)	—			(18,073		)
	Payments for early extinguishment of debt	(25,462		)	—			—			—			(25,462		)
	Exercises of stock options	61			—			—			—			61
	Stock repurchases	(37,792		)	—			—			—			(37,792		)
	Distributions	(73,124		)	—			—			—			(73,124		)
	Net cash provided by (used in) financing activities	131,203			(139,604		)	113,300			—			104,899
	Net increase (decrease) in cash and cash equivalents	174,736			(361		)	243			—			174,618
	Cash and cash equivalents, beginning	18,240			361			681			—			19,282
	Cash and cash equivalents, ending	$	192,976		$	—		$	924		$	—		$	193,900
	DUPONT FABROS TECHNOLOGY, L.P.
	SUPPLEMENTAL CONSOLIDATING STATEMENTS OF CASH FLOWS
	(in thousands)
		Nine months ended September 30, 2012
		Operating			Subsidiary			Subsidiary			Eliminations			Consolidated
		Partnership			Guarantors			Non-Guarantors						Total
	Cash flow from operating activities
	Net cash (used in) provided by operating activities	$	(37,301	)	$	129,718		$	10,323		$	—		$	102,740
	Cash flow from investing activities
	Investments in real estate – development	(25		)	(73,359		)	(9,370		)	—			(82,754		)
	Investments in affiliates	46,653			(45,398		)	(1,255		)	—			—
	Interest capitalized for real estate under development	—			(2,654		)	—			—			(2,654		)
	Improvements to real estate	—			(3,306		)	(27		)	—			(3,333		)
	Additions to non-real estate property	(17		)	(38		)	—			—			(55		)
	Net cash provided by (used in) investing activities	46,611			(124,755		)	(10,652		)	—			(88,796		)
	Cash flow from financing activities
	Line of credit:
	Proceeds	15,000			—			—			—			15,000
	Repayments	(35,000		)	—			—			—			(35,000		)
	Repayments of mortgage notes payable	—			(3,900		)	—			—			(3,900		)
	Payments of financing costs	(2,084		)	—			—			—			(2,084		)
	Issuance of preferred units, net of offering costs	62,694			—			—			—			62,694
	Exercises of stock options	868			—			—			—			868
	Advances from related parties	4,000			—			—			—			4,000
	Distributions	(51,199		)	—			—			—			(51,199		)
	Net cash used in financing activities	(5,721		)	(3,900		)	—			—			(9,621		)
Net increase (decrease) in cash and cash equivalents	3,589			1,063			(329		)	—			4,323
Cash and cash equivalents, beginning	9,174			196			727			—			10,097
Cash and cash equivalents, ending	$	12,763		$	1,259		$	398		$	—		$	14,420

1_Description_of_Business_Deta

1. Description of Business (Details)	3 Months Ended
	Sep. 30, 2013
Subsidiary or Equity Method Investee [Line Items]
Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest	80.30%
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest	1.00%

2_Significant_Accounting_Polic3

2. Significant Accounting Policies Narrative (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Significant Accounting Policies [Line Items]
Cash at Bank Held by Parent Company not Part of Operating Partnership	$4,300,000		$4,300,000
Property, Plant and Equipment, Useful Life			40 years
Depreciation	22,200,000	21,300,000	66,400,000	63,300,000
Tenant Origination Cost Amortization	800,000	800,000	2,400,000	2,400,000
Asset impairment charges	0	0	0	0
Repayments of Notes Payable			138,300,000	0
Write off of Deferred Debt Issuance Cost			32,310,000	0
Unsecured notes payable	731,889,000		731,889,000		550,000,000
Payments of Financing Costs			18,073,000	2,084,000
Payments for Leasing Costs	1,900,000	100,000	2,100,000	900,000
Amortization of Deferred Leasing Fees	1,200,000	1,100,000	3,100,000	3,300,000
Fuel Inventory	3,900,000		3,900,000		3,000,000
Account receivable reserve	1,400,000		1,400,000		900,000
Deferred Rent Reserve	2,100,000		2,100,000		2,100,000
Loans and Leases Receivable, Gross, Commercial	5,500,000		5,500,000
Minimum [Member] | Building and Building Improvements [Member]
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life			10 years
Minimum [Member] | Personal Property [Member]
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life			3 years
Maximum [Member] | Building and Building Improvements [Member]
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life			40 years
Maximum [Member] | Personal Property [Member]
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life			7 years
DuPont Fabros Technology, L.P. [Member]
Significant Accounting Policies [Line Items]
Repayments of Notes Payable			138,300,000	0
Write off of Deferred Debt Issuance Cost			32,310,000	0
Unsecured notes payable	731,889,000		731,889,000		550,000,000
Payments of Financing Costs			18,073,000	2,084,000
Unsecured Notes due 2017 [Member]
Significant Accounting Policies [Line Items]
Write off of Deferred Debt Issuance Cost			5,100,000
Unsecured notes payable	131,900,000		131,900,000		550,000,000
Debt Instrument, Repurchased Face Amount	418,100,000		418,100,000
Acc Five Term Loan [Member]
Significant Accounting Policies [Line Items]
Repayments of Notes Payable			138,300,000
Write off of Deferred Debt Issuance Cost			1,700,000
Unsecured Notes due 2021 [Member]
Significant Accounting Policies [Line Items]
Unsecured notes payable	600,000,000		600,000,000		0
Unsecured Notes due 2017 [Member]
Significant Accounting Policies [Line Items]
Unsecured notes payable	131,889,000		131,889,000		550,000,000
Payments of Financing Costs			$13,400,000

2_Significant_Accounting_Polic4

2. Significant Accounting Policies Schedule of Deferred Financing Costs (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Significant Accounting Policies [Line Items]
Financing costs	$25,988	$23,082
Accumulated amortization	-4,849	-10,531
Financing costs, net	$21,139	$12,551

2_Significant_Accounting_Polic5

2. Significant Accounting Policies Schedule of Deferred Leasing Costs (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Accounting Policies [Abstract]
Leasing costs	$48,362	$46,719
Accumulated amortization	-26,193	-23,600
Leasing costs, net	$22,169	$23,119

2_Significant_Accounting_Polic6

2. Significant Accounting Policies Schedule of Above and Below Market Lease Intangibles (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Accounting Policies [Abstract]
Lease contracts above market value	$23,100	$23,100
Accumulated amortization	-13,671	-12,845
Lease contracts above market value, net	9,429	10,255
Lease contracts below market value	39,375	39,375
Accumulated amortization	-27,972	-25,353
Lease contracts below market value, net	$11,403	$14,022

2_Significant_Accounting_Polic7

2. Significant Accounting Policies Schedule of Redeemable Noncontrolling Interests - Operating Partnership (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Accounting Policies [Abstract]
Balance at December 31, 2012, units			18,786,806
Balance at December 31, 2012			$453,889
Net income attributable to redeemable noncontrolling interests – operating partnership	-2,541	2,181	2,397	5,757
Distributions declared			-11,132
Redemption of operating partnership units, shares			-2,904,769
Redemption of operating partnership units			-70,200	-5,700
Adjustments to redeemable noncontrolling interests – operating partnership			34,326	21,643
Balance at March 31, 2013, units	15,882,037		15,882,037
Balance at March 31, 2013	$409,280		$409,280

2_Significant_Accounting_Polic8

2. Significant Accounting Policies Schedule of Redeemable Partnership Units (Details) (USD $)	9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Significant Accounting Policies [Line Items]
Balance at December 31, 2012, units	18,786,806
Balance at December 31, 2012	$453,889
Redemption of operating partnership units, shares	-2,904,769
Redemption of operating partnership units	-70,200	-5,700
Balance at March 31, 2013, units	15,882,037
Balance at March 31, 2013	409,280
DuPont Fabros Technology, L.P. [Member]
Significant Accounting Policies [Line Items]
Balance at December 31, 2012, units	18,786,806
Balance at December 31, 2012	453,889
Redemption of operating partnership units, shares	-2,904,769
Redemption of operating partnership units	-70,200	-5,700
Adjustments to redeemable partnership units	25,591
Balance at March 31, 2013, units	15,882,037
Balance at March 31, 2013	$409,280

2_Significant_Accounting_Polic9

2. Significant Accounting Policies Schedule of Net Income Attributable to Controlling Interests and Transfers to Redeemable Noncontrolling Interests – Operating Partnership (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Accounting Policies [Abstract]
Net income attributable to controlling interests	($3,417)	$14,097	$30,119	$39,373
Net change in the Company’s common stock and additional paid in capital due to the redemption of OP units and other adjustments to redeemable noncontrolling interests – operating partnership	-31,915	61,690	35,874	-15,943
Net Income Attributable to Controlling Interests and Transfers from Redeemable Noncontrolling Interests Operating Partnership	($35,332)	$75,787	$65,993	$23,430

3_Real_Estate_Assets_Details

3. Real Estate Assets (Details) (USD $)	Sep. 30, 2013		Dec. 31, 2012
In Thousands, unless otherwise specified
Real Estate Assets [Line Items]
Land	$75,956		$73,197
Buildings and improvements	2,420,123		2,315,499
Construction in progress and land held for development	197,400	[1]	218,934
Income producing property	2,496,079		2,388,696
Real Estate, Gross	2,693,479
ACC2 [Member]
Real Estate Assets [Line Items]
Land	2,500
Buildings and improvements	159,093
Construction in progress and land held for development	0
Income producing property	161,593
ACC3 [Member]
Real Estate Assets [Line Items]
Land	1,071
Buildings and improvements	95,608
Construction in progress and land held for development	0
Income producing property	96,679
ACC4 [Member]
Real Estate Assets [Line Items]
Land	6,600
Buildings and improvements	538,090
Construction in progress and land held for development	0
Income producing property	544,690
ACC5 [Member]
Real Estate Assets [Line Items]
Land	6,443
Buildings and improvements	297,862
Construction in progress and land held for development	0
Income producing property	304,305
ACC6 [Member]
Real Estate Assets [Line Items]
Land	5,518
Buildings and improvements	215,220
Construction in progress and land held for development	0
Income producing property	220,738
VA3 [Member]
Real Estate Assets [Line Items]
Land	9,000
Buildings and improvements	177,489
Construction in progress and land held for development	0
Income producing property	186,489
VA4 [Member]
Real Estate Assets [Line Items]
Land	6,800
Buildings and improvements	148,481
Construction in progress and land held for development	0
Income producing property	155,281
CH1 [Member]
Real Estate Assets [Line Items]
Land	23,611
Buildings and improvements	358,403
Construction in progress and land held for development	0
Income producing property	382,014
NJ1 Phase I [Member]
Real Estate Assets [Line Items]
Land	4,311
Buildings and improvements	208,798
Construction in progress and land held for development	0
Income producing property	213,109
SC1 Phase I [Member]
Real Estate Assets [Line Items]
Land	10,102
Buildings and improvements	221,079
Construction in progress and land held for development	0
Income producing property	$231,181
[1]	(1)Properties located in Ashburn, VA (ACC7 and ACC8); Piscataway, NJ (NJ1 Phase II), Elk Grove Village, IL (CH2) and Santa Clara, CA (SC1 Phase II and SC2).

4_Debt_Summary_Details

4. Debt Summary (Details) (USD $)	3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Mortgage notes payable	$115,000,000	$115,000,000	$139,600,000
Unsecured Term Loan	120,000,000	120,000,000	0
Long-term Debt	966,889,000	966,889,000	707,600,000
Unsecured notes payable	731,889,000	731,889,000	550,000,000
Line of credit	0	0	18,000,000
Total Debt in Percentage	100.00%	100.00%
Debt, Weighted Average Interest Rate	5.30%	5.30%
Long Term Debt, Weighted Average Maturity in Years	6.2	6.2
Capitalized Interest and Deferred Financing Cost Amortization	1,100,000	1,600,000
Fixed Rate Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Fixed Interest, Amount	731,889,000	731,889,000	550,000,000
Percentage of Total Debt	76.00%	76.00%
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	6.30%	6.30%
FixedInterestDebtMaturityInYears	6.5	6.5
Unsecured Notes due 2021 [Member]
Debt Instrument [Line Items]
Unsecured notes payable	600,000,000	600,000,000	0
Percentage of Total Debt	62.00%	62.00%
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	5.88%	5.88%
Unsecured Debt Maturity, in Years	8	8
Unsecured Notes due 2017 [Member]
Debt Instrument [Line Items]
Unsecured notes payable	131,889,000	131,889,000	550,000,000
Percentage of Total Debt	14.00%	14.00%
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	8.50%	8.50%
Unsecured Debt Maturity, in Years	0.1	0.1
Floating Rate Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Amount	235,000,000	235,000,000	157,600,000
Percentage of Total Debt	24.00%	24.00%
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate	2.00%	2.00%
VariableInterestDebtMaturityInYears	4.9	4.9
Unsecured Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit	0	0	18,000,000
Percentage of Total Debt	0.00%	0.00%
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate	0.00%	0.00%
Unsecured Debt Maturity, in Years	2.5	2.5
Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Unsecured Term Loan	120,000,000	120,000,000	0
Percentage of Total Debt	12.00%	12.00%
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate	1.90%	1.90%
Unsecured Debt Maturity, in Years	5.4	5.4
Acc Five Term Loan [Member]
Debt Instrument [Line Items]
Term Loan	0	0	139,600,000
Percentage of Total Debt	0.00%	0.00%
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate	0.00%	0.00%
Secured Debt Maturity, in Years	0	0
AccThreeTermLoan [Member]
Debt Instrument [Line Items]
Term Loan	115,000,000	115,000,000	0
Percentage of Total Debt	12.00%	12.00%
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate	2.00%	2.00%
Secured Debt Maturity, in Years	4.5	4.5
Secured Debt [Member]
Debt Instrument [Line Items]
Mortgage notes payable	115,000,000	115,000,000	139,600,000
Percentage of Total Debt	12.00%	12.00%
Long-Term Debt, Secured Interest Rate	2.00%	2.00%
Secured Debt Maturity, in Years	4.5	4.5
Unsecured Debt [Member]
Debt Instrument [Line Items]
Unsecured Term Loan	$851,889,000	$851,889,000	$568,000,000
Percentage of Total Debt	88.00%	88.00%
Long-Term Debt, Unsecured Interest Rate	5.70%	5.70%
Unsecured Debt Maturity, in Years	6.4	6.4

4_Debt_ACC3_Term_Loan_Details

4. Debt ACC3 Term Loan (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2013
			AccThreeTermLoan [Member]	AccThreeTermLoan [Member]	AccThreeTermLoan [Member]	Unsecured Term Loan [Member]	Maximum [Member]	Minimum [Member]	Minimum [Member]
				Libor Rate Loans [Member]	Base Rate Loans [Member]		Unsecured Term Loan [Member]	AccThreeTermLoan [Member]	Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Issuance Date			27-Mar-13			13-Sep-13
Mortgage notes payable	$115,000,000	$139,600,000	$115,000,000
Debt Instrument, Maturity Date			27-Mar-18			15-Feb-19
Debt Instrument, Basis Spread on Variable Rate	1.85%			1.85%	0.85%
Ratio of Total Indebtedness To Gross Assets Value							60.00%
Fixed Charge Coverage Ratio									1.7
Tangible Net Worth Amount									$1,300,000,000
Percentage Of Equity Offerings And Interests In Operating Partnerships To Be Added To Tangible Net Worth Threshold									80.00%
Debt Service Coverage Ratio								1.5

4_Debt_Unsecured_Term_Loan_Det

4. Debt Unsecured Term Loan (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2013
			Unsecured Term Loan [Member]	Maximum [Member]	Minimum [Member]
				Unsecured Term Loan [Member]	Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Issuance Date			13-Sep-13
Unsecured Term Loan	$120,000,000	$0	$195,000,000
Debt Instrument, Maturity Date			15-Feb-19
Unsecured Term Loan Initial Advance			120,000,000
Unsecured Term Loan Remaining Balance To Be Drawn			75,000,000
Unsecured Term Loan Draw Minimum Increment			25,000,000
Delayed Draw Deadline			10-Jan-14
Unsecured Term Loan Accordion Increase Amount			55,000,000
Accordion Exercise Date			18-Oct-13
Unsecured Term Loan with Accordion			250,000,000
Unsecured Term Loan Accordion Closing Advance			34,000,000
Unsecured Term Loan Remaining Balance To Be Drawn Including Accordion			96,000,000
Unsecured Debt To Unencumbered Assets				60.00%
Income from Unencumbered Assets To Unsecured Debt					12.50%
Ratio of Total Indebtedness To Gross Assets Value				60.00%
Fixed Charge Coverage Ratio					1.7
Tangible Net Worth Amount					$1,300,000,000
Percentage Of Equity Offerings And Interests In Operating Partnerships To Be Added To Tangible Net Worth Threshold					80.00%

4_Debt_Applicable_Margin_of_Un

4. Debt Applicable Margin of Unsecured Term Loan (Details)	9 Months Ended
	Sep. 30, 2013
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.85%
Pricing Level 1 [Member] | Libor Rate Loans [Member] | Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.75%
Pricing Level 1 [Member] | Base Rate Loans [Member] | Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.75%
Pricing Level 2 [Member] | Libor Rate Loans [Member] | Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.90%
Pricing Level 2 [Member] | Base Rate Loans [Member] | Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.90%
Pricing Level 3 [Member] | Libor Rate Loans [Member] | Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.05%
Pricing Level 3 [Member] | Base Rate Loans [Member] | Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.05%
Pricing Level 4 [Member] | Libor Rate Loans [Member] | Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.20%
Pricing Level 4 [Member] | Base Rate Loans [Member] | Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.20%
Pricing Level 5 [Member] | Libor Rate Loans [Member] | Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.40%
Pricing Level 5 [Member] | Base Rate Loans [Member] | Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.40%
Maximum [Member] | Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Ratio of Total Indebtedness To Gross Assets Value	60.00%
Maximum [Member] | Pricing Level 1 [Member] | Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Ratio of Total Indebtedness To Gross Assets Value	35.00%
Maximum [Member] | Pricing Level 2 [Member] | Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Ratio of Total Indebtedness To Gross Assets Value	40.00%
Maximum [Member] | Pricing Level 3 [Member] | Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Ratio of Total Indebtedness To Gross Assets Value	45.00%
Maximum [Member] | Pricing Level 4 [Member] | Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Ratio of Total Indebtedness To Gross Assets Value	52.50%
Minimum [Member] | Pricing Level 2 [Member] | Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Ratio of Total Indebtedness To Gross Assets Value	35.00%
Minimum [Member] | Pricing Level 3 [Member] | Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Ratio of Total Indebtedness To Gross Assets Value	40.00%
Minimum [Member] | Pricing Level 4 [Member] | Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Ratio of Total Indebtedness To Gross Assets Value	45.00%
Minimum [Member] | Pricing Level 5 [Member] | Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Ratio of Total Indebtedness To Gross Assets Value	52.50%

4_Debt_Credit_Rating_for_Unsec

4. Debt Credit Rating for Unsecured Term Loan (Details)	Sep. 30, 2013
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.85%
Credit Rating Level 1 [Member] | Greaten than A- S&P, Moody's A3 Rating [Member] | Libor Rate Loans [Member] | Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.95%
Credit Rating Level 1 [Member] | Greaten than A- S&P, Moody's A3 Rating [Member] | Base Rate Loans [Member] | Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.00%
Credit Rating Level 2 [Member] | Greater than BBB plus S&P, Moody's Baa1 Rating [Member] | Libor Rate Loans [Member] | Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.05%
Credit Rating Level 2 [Member] | Greater than BBB plus S&P, Moody's Baa1 Rating [Member] | Base Rate Loans [Member] | Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.05%
Credit Rating Level 3 [Member] | Greater than BBB S&P, Moody's Baa2 Rating [Member] | Libor Rate Loans [Member] | Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.20%
Credit Rating Level 3 [Member] | Greater than BBB S&P, Moody's Baa2 Rating [Member] | Base Rate Loans [Member] | Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.20%
Credit Rating Level 4 [Member] | Greater than BBB- S&P, Moody's Baa3 Rating [Member] | Libor Rate Loans [Member] | Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.50%
Credit Rating Level 4 [Member] | Greater than BBB- S&P, Moody's Baa3 Rating [Member] | Base Rate Loans [Member] | Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.50%
Credit Rating Level 5 [Member] | Less than BBB- S&P, Moody's Baa3 Rating [Member] | Libor Rate Loans [Member] | Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.95%
Credit Rating Level 5 [Member] | Less than BBB- S&P, Moody's Baa3 Rating [Member] | Base Rate Loans [Member] | Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.95%

4_Debt_Unsecured_Notes_due_202

4. Debt Unsecured Notes due 2021 (Details) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Unsecured notes payable	$731,889	$550,000
Unsecured Notes due 2021 [Member]
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	24-Sep-13
Unsecured notes payable	$600,000	$0
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	5.88%
First Semiannual Interest Payment Term	March 15th
Second Semiannual Interest Payment Term	September 15th
Unencumbered Assets to Unsecured Debt	150.00%
Unsecured Notes due 2021 [Member] | Prior to September Fifteen Two Thousand Sixteen [Member]
Debt Instrument [Line Items]
Percentage Of Principal Amount At Which Unsecured Notes May Be Redeemed	100.00%
Unsecured Notes due 2021 [Member] | Change in control [Member]
Debt Instrument [Line Items]
Percentage Of Principal Amount At Which Unsecured Notes May Be Redeemed	101.00%
Unsecured Notes due 2021 [Member] | Asset Sales [Member]
Debt Instrument [Line Items]
Percentage Of Principal Amount At Which Unsecured Notes May Be Redeemed	100.00%

4_Debt_Summary_Of_Maturities_A

4. Debt Summary Of Maturities And Percentage Of Redemption Price Of Unsecured Notes (Details) (Unsecured Notes due 2021 [Member])	Sep. 30, 2013
2016
Debt Instrument [Line Items]
Redemption Price	104.41%
2017
Debt Instrument [Line Items]
Redemption Price	102.94%
2018
Debt Instrument [Line Items]
Redemption Price	101.47%
2019 and thereafter
Debt Instrument [Line Items]
Redemption Price	100.00%

4_Debt_Unsecured_Credit_Facili

4. Debt Unsecured Credit Facility (Details) (USD $)	9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Extension Option On Debt Maturity Years	1
Line of credit	$0	$18,000,000
Letters of Credit Outstanding, Amount	0
Unsecured Credit Facility [Member]
Debt Instrument [Line Items]
Line Of Credit Capacity Prior To Second Amendment	225,000,000
Line of Credit Facility, Maximum Borrowing Capacity	400,000,000
Debt Instrument, Maturity Date	21-Mar-16
Basis Points Extension Fee On Total Commitment	25
Facility amount available for Letters of Credit	35,000,000
Line Of Credit Commitment If Increased	$600,000,000

4_Debt_Applicable_Margin_of_Un1

4. Debt Applicable Margin of Unsecured Credit Facility (Details) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.85%
Letters of Credit Outstanding, Amount	0
Pricing Level 1 [Member] | Unsecured Credit Facility [Member] | Libor Rate Loans [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.85%
Pricing Level 1 [Member] | Unsecured Credit Facility [Member] | Base Rate Loans [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.85%
Pricing Level 1 [Member] | Unsecured Credit Facility [Member] | Maximum [Member]
Debt Instrument [Line Items]
Ratio of Total Indebtedness To Gross Assets Value	35.00%
Pricing Level 2 [Member] | Unsecured Credit Facility [Member] | Libor Rate Loans [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.00%
Pricing Level 2 [Member] | Unsecured Credit Facility [Member] | Base Rate Loans [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.00%
Pricing Level 2 [Member] | Unsecured Credit Facility [Member] | Maximum [Member]
Debt Instrument [Line Items]
Ratio of Total Indebtedness To Gross Assets Value	40.00%
Pricing Level 2 [Member] | Unsecured Credit Facility [Member] | Minimum [Member]
Debt Instrument [Line Items]
Ratio of Total Indebtedness To Gross Assets Value	35.00%
Pricing Level 3 [Member] | Unsecured Credit Facility [Member] | Libor Rate Loans [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.15%
Pricing Level 3 [Member] | Unsecured Credit Facility [Member] | Base Rate Loans [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.15%
Pricing Level 3 [Member] | Unsecured Credit Facility [Member] | Maximum [Member]
Debt Instrument [Line Items]
Ratio of Total Indebtedness To Gross Assets Value	45.00%
Pricing Level 3 [Member] | Unsecured Credit Facility [Member] | Minimum [Member]
Debt Instrument [Line Items]
Ratio of Total Indebtedness To Gross Assets Value	40.00%
Pricing Level 4 [Member] | Unsecured Credit Facility [Member] | Libor Rate Loans [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.30%
Pricing Level 4 [Member] | Unsecured Credit Facility [Member] | Base Rate Loans [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.30%
Pricing Level 4 [Member] | Unsecured Credit Facility [Member] | Maximum [Member]
Debt Instrument [Line Items]
Ratio of Total Indebtedness To Gross Assets Value	52.50%
Pricing Level 4 [Member] | Unsecured Credit Facility [Member] | Minimum [Member]
Debt Instrument [Line Items]
Ratio of Total Indebtedness To Gross Assets Value	45.00%
Pricing Level 5 [Member] | Unsecured Credit Facility [Member] | Libor Rate Loans [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.50%
Pricing Level 5 [Member] | Unsecured Credit Facility [Member] | Base Rate Loans [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.50%
Pricing Level 5 [Member] | Unsecured Credit Facility [Member] | Minimum [Member]
Debt Instrument [Line Items]
Ratio of Total Indebtedness To Gross Assets Value	52.50%

4_Debt_Credit_Rating_for_Unsec1

4. Debt Credit Rating for Unsecured Credit Facility (Details)	Sep. 30, 2013
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.85%
Unsecured Credit Facility [Member] | Credit Rating Level 1 [Member] | Greaten than A- S&P, Moody's A3 Rating [Member] | Libor Rate Loans [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.05%
Unsecured Credit Facility [Member] | Credit Rating Level 1 [Member] | Greaten than A- S&P, Moody's A3 Rating [Member] | Base Rate Loans [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.05%
Unsecured Credit Facility [Member] | Credit Rating Level 2 [Member] | Greater than BBB plus S&P, Moody's Baa1 Rating [Member] | Libor Rate Loans [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.20%
Unsecured Credit Facility [Member] | Credit Rating Level 2 [Member] | Greater than BBB plus S&P, Moody's Baa1 Rating [Member] | Base Rate Loans [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.20%
Unsecured Credit Facility [Member] | Credit Rating Level 3 [Member] | Greater than BBB S&P, Moody's Baa2 Rating [Member] | Libor Rate Loans [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.35%
Unsecured Credit Facility [Member] | Credit Rating Level 3 [Member] | Greater than BBB S&P, Moody's Baa2 Rating [Member] | Base Rate Loans [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.35%
Unsecured Credit Facility [Member] | Credit Rating Level 4 [Member] | Greater than BBB- S&P, Moody's Baa3 Rating [Member] | Libor Rate Loans [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.50%
Unsecured Credit Facility [Member] | Credit Rating Level 4 [Member] | Greater than BBB- S&P, Moody's Baa3 Rating [Member] | Base Rate Loans [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.50%
Unsecured Credit Facility [Member] | Credit Rating Level 5 [Member] | Less than BBB- S&P, Moody's Baa3 Rating [Member] | Libor Rate Loans [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.10%
Unsecured Credit Facility [Member] | Credit Rating Level 5 [Member] | Less than BBB- S&P, Moody's Baa3 Rating [Member] | Base Rate Loans [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.10%

4_Debt_ACC5_Term_Loan_Details

4. Debt ACC5 Term Loan (Details) (USD $)	9 Months Ended			9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Sep. 30, 2013	Dec. 02, 2009
				Acc Five Term Loan [Member]	Acc Five Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Issuance Date				2-Dec-09
Mortgage notes payable	$115,000		$139,600		$150,000
Repayments of Notes Payable	138,300	0		138,300
Write off of Deferred Debt Issuance Cost	$32,310	$0		$1,700
Debt Instrument, Maturity Date				2-Dec-14
Debt Instrument, Basis Spread on Variable Rate	1.85%			3.00%

4_Debt_Unsecured_Notes_due_201

4. Debt Unsecured Notes due 2017 (Details) (USD $)	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Debt Instrument [Line Items]
Unsecured notes payable	$731,889,000		$550,000,000
Payments of Debt Extinguishment Costs	25,462,000	0
Write off of Deferred Debt Issuance Cost	32,310,000	0
Unsecured Notes due 2017 [Member]
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	16-Dec-09
Unsecured notes payable	131,900,000		550,000,000
Payments of Debt Extinguishment Costs, Called Bonds	-7,100,000
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	8.50%
Second Semiannual Interest Payment Term	December 15
First Semiannual Interest Payment Term	June 15
Unsecured Notes Tender Price	106.04%
Debt Instrument, Repurchased Face Amount	418,100,000
Payments of Debt Extinguishment Costs	-25,500,000
Write off of Deferred Debt Issuance Cost	5,100,000
Write off of Deferred Debt Issuance Cost, Called Bonds	1,600,000
Unsecured Notes due 2017 [Member]
Debt Instrument [Line Items]
Unsecured notes payable	$131,889,000		$550,000,000
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	8.50%

4_Debt_Maturity_Summary_Detail

4. Debt Maturity Summary (Details) (USD $)

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

In Thousands, unless otherwise specified

2013 [Member]

2014 [Member]

2015 [Member]

2016 [Member]

2017 [Member]

2018 [Member]

Long Term Debt Maturities Repayments Of Principal In Year Seven [Member]

Long Term Debt Maturities Repayments Of Principal In Year Eight [Member]

Long Term Debt Maturities Repayments Of Principal In Year Nine [Member]

Fixed Rate Debt [Member]

Fixed Rate Debt [Member]

Fixed Rate Debt [Member]

Fixed Rate Debt [Member]

Fixed Rate Debt [Member]

Fixed Rate Debt [Member]

Fixed Rate Debt [Member]

Fixed Rate Debt [Member]

Fixed Rate Debt [Member]

Fixed Rate Debt [Member]

Fixed Rate Debt [Member]

Floating Rate Debt [Member]

Floating Rate Debt [Member]

Floating Rate Debt [Member]

Floating Rate Debt [Member]

Floating Rate Debt [Member]

Floating Rate Debt [Member]

Floating Rate Debt [Member]

Floating Rate Debt [Member]

Floating Rate Debt [Member]

Floating Rate Debt [Member]

Floating Rate Debt [Member]

Unsecured Notes due 2017 [Member]

AccThreeTermLoan [Member]

AccThreeTermLoan [Member]

AccThreeTermLoan [Member]

2013 [Member]

2014 [Member]

2015 [Member]

2016 [Member]

2017 [Member]

2018 [Member]

Long Term Debt Maturities Repayments Of Principal In Year Seven [Member]

Long Term Debt Maturities Repayments Of Principal In Year Eight [Member]

Long Term Debt Maturities Repayments Of Principal In Year Nine [Member]

2013 [Member]

2014 [Member]

2015 [Member]

2016 [Member]

2017 [Member]

2018 [Member]

Long Term Debt Maturities Repayments Of Principal In Year Seven [Member]

Long Term Debt Maturities Repayments Of Principal In Year Eight [Member]

Long Term Debt Maturities Repayments Of Principal In Year Nine [Member]

BeginningAprilOneTwoThousandSixteen [Member]

BeginningAprilOneTwoThousandSeventeen [Member]

Debt Instrument [Line Items]

Unsecured Notes Call Date

24-Sep-13

Debt Instrument, Periodic Payment, Principal

$131,889

$0

$0

$3,750

$8,750

$102,500

$120,000

$0

$600,000

$131,889

[1]

$0

$0

$0

$0

$0

$0

$0

$600,000

[2]

$0

$0

$0

$3,750

[3]

$8,750

[3]

$102,500

[3]

$120,000

[4]

$0

$0

$1,250

$2,500

Long-term Debt, Percentage Bearing Fixed Interest, Amount

731,889

550,000

Long-term Debt, Percentage Bearing Variable Interest, Amount

235,000

157,600

Long-term Debt

$966,889

$707,600

Percentage of Total Debt

13.60%

0.00%

0.00%

0.40%

0.90%

10.60%

12.40%

0.00%

62.10%

76.00%

24.00%

Total Debt in Percentage

100.00%

Debt, Weighted Average Interest Rate

5.30%

8.50%

0.00%

0.00%

2.00%

2.00%

2.00%

1.90%

0.00%

5.90%

Debt Instrument, Maturity Date

27-Mar-18

Debt Instrument, Frequency of Periodic Payment

Quarterly

Debt Instrument, Date of First Required Payment

1-Apr-16

Debt Instrument, Date of Increased Required Payment

1-Apr-17

Unsecured Notes Redemption Date

24-Oct-13

[1]

The remaining Unsecured Notes due 2017 were irrevocably called on September 24, 2013 and were redeemed on October 24, 2013.

[2]

The 5.875% Unsecured Notes due 2021 were issued in September 2013.

[3]

The ACC3 Term Loan matures on March 27, 2018 with no extension option. Quarterly principal payments of $1.25 million begin on April 1, 2016, increase to $2.5 million on April 1, 2017 and continue through maturity.

[4]

The Unsecured Term Loan matures on February 15, 2019 with no extension option. In October 2013, the Company exercised the accordion feature, increasing this loan to $250 million and drawing an additional $34.0 million. The remaining balance of $96.0 million must be drawn by January 10, 2014.

5_Commitments_and_Contingencie1

5. Commitments and Contingencies (Details) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013
Long-term Purchase Commitment [Line Items]
Percentage Of Built In Gain That Can Be Recognized Without Triggering Tax Protection Provisions	60.00%
Initial Built In Gain	$667
Amount of Built In Gain That Can Be Recognized Without Triggering Tax Protection Provisions	400
Increase in Percentage of Built In Gain That Can Be Recognized Each Year Without Triggering Tax Protection Provisions	10.00%
Percentage Of Built In Gain That Can Be Recognized In Two Thousand Seventeen Without Triggering Tax Protection Provisions	100.00%
Built In Gain Amount Tax Protected	267
Percentage of Disinterested Members of Board for Approving Sales Resulting in Payments to Executives or Directors	75.00%
ACC7 Phase I [Member]
Long-term Purchase Commitment [Line Items]
Estimated Control Cost	157.4
Amount of Control Estimate Incurred	51.4
Total Commitments For Purchase of Equipment And Labor Related to Development	49.4
SC1 Phase IIA [Member]
Long-term Purchase Commitment [Line Items]
Estimated Control Cost	108.4
Amount of Control Estimate Incurred	3.7
Total Commitments For Purchase of Equipment And Labor Related to Development	$16.70

6_Redeemable_noncontrolling_in1

6. Redeemable noncontrolling interests operating partnership / Redeemable partnership units (Details) (USD $)	9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Redeemable noncontrolling interests – operating partnership / Redeemable partnership units [Line Items]
Redeemable noncontrolling interests - operating partnership	$409,280	$453,889
Share Price	$25.77	$24.16
Redemption of operating partnership units, shares	2,904,769

7_Preferred_Stock_Details

7. Preferred Stock (Details) (USD $)	3 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012
Series A cumulative redeemable perpetual preferred stock [Member]
Preferred Stock [Line Items]
Preferred stock, shares issued	7,400,000			7,400,000
Preferred Stock, Dividend Rate, Percentage	7.88%
Preferred stock, $.001 par value, 50,000,000 shares authorized	$185,000			$185,000
Preferred Stock, Liquidation Preference Per Share	$25
Preferred Stock, Dividends Per Share, Declared	$0.49	$0.49	$0.49
Dividends Payable, Date of Record	4-Oct-13	5-Jul-13	5-Apr-13
Dividends Payable, Date to be Paid	15-Oct-13	15-Jul-13	15-Apr-13
Series B cumulative redeemable perpetual preferred stock [Member]
Preferred Stock [Line Items]
Preferred stock, shares issued	6,650,000			6,650,000
Preferred Stock, Dividend Rate, Percentage	7.63%
Preferred stock, $.001 par value, 50,000,000 shares authorized	$166,250			$166,250
Preferred Stock, Liquidation Preference Per Share	$25
Preferred Stock, Dividends Per Share, Declared	$0.48	$0.48	$0.48
Dividends Payable, Date of Record	4-Oct-13	5-Jul-13	5-Apr-13
Dividends Payable, Date to be Paid	15-Oct-13	15-Jul-13	15-Apr-13

8_Stockholders_Equity_of_the_R1

8. Stockholders Equity of the REIT and Partners Capital of the OP (Details) (USD $)	3 Months Ended		9 Months Ended		3 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Mar. 31, 2013
					Common Stock [Member]	Common Stock [Member]
Stockholders’ Equity of the REIT and Partners’ Capital of the OP [Line Items]
Issuance of stock awards, shares			152,931
Redemption of operating partnership units, shares			2,904,769
Dividends declared per common share	$0.25	$0.15	$0.70	$0.42	$0.25	$0.20
Dividends Payable, Date of Record					5-Jul-13	5-Apr-13
Dividends Payable, Date to be Paid					15-Jul-13	15-Apr-13
Common stock repurchase, shares			-1,632,673
Common stock repurchases			($37,792)

9_Equity_Compensation_Plan_Nar

9. Equity Compensation Plan Narrative (Details) (USD $)	9 Months Ended				3 Months Ended
In Millions, except Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2013
		Restricted Stock [Member]	Stock Options [Member]	Performance Shares [Member]	Minimum [Member]	Maximum [Member]
Equity Compensation Plan [Line Items]
Maximum Number of Share Equivalents Authorized	6,300,000
Share equivalent ratio, other than stock options and SARs	2.36
Cumulative Share Equivalents Issued From The Plan	1,634,354
Share Equivalents Remaining Available	4,665,646
Shares of restricted stock, Granted	139,963
Value of Restricted Stock Awarded during period	$3.20
Shares of restricted stock, Vested	158,521
Value of Restricted Stock on Vesting Date	3.7
Unearned Compensation on Restricted Stock	$4.30			$2
Weighted Average Vesting Period		0 years 0 months 402 days	0 years 0 months 365 days
Potential Number Of Shares Issued At Vesting Of Performance Units					0.00%	300.00%

9_Equity_Compensation_Plan_Sum

9. Equity Compensation Plan Summary of Restricted Stock (Details) (USD $)	9 Months Ended
	Sep. 30, 2013
Equity Compensation Plan [Line Items]
Shares of restricted stock, Unvested balance at December 31, 2011	297,919
Shares of restricted stock, Granted	139,963
Shares of restricted stock, Vested	-158,521
Shares of restricted stock, Forfeited	-7,203
Shares of restricted stock, Unvested balance at September 30, 2012	272,158
Weighted Average Grant Date Fair Value, Unvested balance at December 31, 2011	$22.31
Weighted Average Grant Date Fair Value, Granted	$22.78
Weighted Average Grant Date Fair Value, Vested	$21.71
Weighted Average Grant Date Fair Value, Forfeited	$22.77

9_Equity_Compensation_Plan_Sum1

9. Equity Compensation Plan Summary of Stock Options (Details) (USD $)	9 Months Ended
In Millions, except Share data, unless otherwise specified	Sep. 30, 2013
Equity Compensation Plan [Line Items]
Under option, December 31, 2011	2,076,781
Granted	374,214
Exercised	-12,000
Forfeited	0
Under option, September 30, 2012	2,438,995
Weighted Average Exercise Price, Under Option, December 31, 2011	$15.17
Weighted Average Exercise Price, Granted	$22.62
Weighted Average Exercise Price, Exercised	$5.06
Weighted Average Exercise Price, Forfeited	$0
Weighted Average Exercise Price, Under Option, September 30, 2012	$16.37
Total Unearned Compensation	$2.90
Weighted Average Remaining Contractual Term	7 years 0 months 0 days
Stock Options [Member]
Equity Compensation Plan [Line Items]
Weighted Average Vesting Period	0 years 0 months 365 days

9_Equity_Compensation_Plan_Sum2

9. Equity Compensation Plan Summary of Unvested Stock Options (Details) (USD $)	9 Months Ended
	Sep. 30, 2013
Equity Compensation Plan [Line Items]
Unvested balance at December 31, 2011	809,991
Granted	374,214
Vested	-399,481
Forfeited	0
Unvested balance at September 30, 2012	784,724
Weighted Average Grant Date Fair Value, Unvested at December 31, 2011	$6.96
Weighted Average Grant Date Fair Value, Granted	$4.75
Weighted Average Grant Date Fair Value, Vested	$7.34
Weighted Average Grant Date Fair Value, Forfeited	$0
Weighted Average Grant Date Fair Value, Unvested at September 30, 2012	$5.71

9_Equity_Compensation_Plan_Sum3

9. Equity Compensation Plan Summary of Exercisable Stock Options (Details) (USD $)	9 Months Ended
In Millions, except Share data, unless otherwise specified	Sep. 30, 2013
Equity Compensation Plan [Line Items]
Options Exercisable at December 31, 2011	1,266,790
Vested	399,481
Exercised	-12,000
Options Exercisable at September 30, 2012	1,654,271
Weighted Average Grant Date Fair Value, Exercisable at December 31, 2011	$3.52
Weighted Average Grant Date Fair Value, Vested	$7.34
Weighted Average Grant Date Fair Value, Exercised	$1.48
Weighted Average Grant Date Fair Value, Exercisable at September 30, 2012	$4.46
Intrinsic Value	$20.70
Weighted Average Exercise Price	$13.26
Weighted Average Remaining Contractual Term	6 years 0 months 110 days

9_Equity_Compensation_Plan_Sum4

9. Equity Compensation Plan Summary of Assumptions for Stock Options Granted (Details) (USD $)	9 Months Ended
In Millions, except Share data, unless otherwise specified	Sep. 30, 2013
	Rate
Equity Compensation Plan [Line Items]
Number of Options Granted	374,214
Exercise Price	$22.62
Expected term (years)	5 years 0 months 0 days
Expected volatility	34.00%
Expected annual dividend	4.00%
Risk-free rate	0.83%
Total grant fair value at date of grant (millions)	$1.80

9_Equity_Compensation_Plan_Sum5

9. Equity Compensation Plan Summary of Assumptions Used for Performance Units Granted (Details) (USD $)	9 Months Ended	3 Months Ended
In Millions, except Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2013
	Rate	Performance Shares [Member]
Equity Compensation Plan [Line Items]
Performance Units Granted In Period		60,468
Expected volatility	34.00%	33.00%
Expected annual dividend	4.00%	4.00%
Risk-free rate	0.83%	0.40%
Performance unit fair value at date of grant		$25.59
Total grant fair value at date of grant (millions)	$1.80	$1.50
Maximum value of grant on vesting date based on closing price of the Company's stock at the date of grant		$4.10

10_Earnings_Per_Share_of_the_R2

10. Earnings Per Share of the REIT (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Earnings per share of the REIT [Line Items]
Weighted average common shares – basic	64,432,010	62,994,500	64,631,772	62,820,979
Effect of dilutive securities	0	887,163	853,658	906,152
Weighted average common shares – diluted	64,432,010	63,881,663	65,485,430	63,727,131
Net income attributable to common shares	($10,228)	$7,286	$9,686	$19,132
Net income allocated to unvested restricted shares	-67	-45	-191	-128
Net income attributable to common shares, adjusted	-10,295	7,241	9,495	19,004
Earnings per common share – basic	($0.16)	$0.11	$0.15	$0.30
Adjustments to redeemable noncontrolling interests	-25	22	25	62
Adjusted net income available to common shares	($10,253)	$7,308	$9,711	$19,194
Earnings per common share – diluted	($0.16)	$0.11	$0.15	$0.30
Restricted Shares	300,000	0	0
Stock Options excluded from diluted earnings per share or unit	2,400,000	900,000	1,200,000	900,000
Performance Units excluded from diluted earnings per share or unit	100,000	100,000	100,000	100,000

11_Earnings_Per_Unit_of_the_Op2

11. Earnings Per Unit of the Operating Partnership (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Earnings per unit of the Operating Partnership [Line Items]
Weighted average common units – basic (includes redeemable partnership units and units of general and limited partners)	80,321,840	81,826,688	80,626,882	81,724,511
Effect of dilutive securities	0	887,163	853,658	906,152
Weighted average common units – diluted	80,321,840	82,713,851	81,480,540	82,630,663
Restricted Units	300,000	0	0
Stock Options excluded from diluted earnings per share or unit	2,400,000	900,000	1,200,000	900,000
Performance Units excluded from diluted earnings per share or unit	100,000	100,000	100,000	100,000
DuPont Fabros Technology, L.P. [Member]
Earnings per unit of the Operating Partnership [Line Items]
Weighted average common units – basic (includes redeemable partnership units and units of general and limited partners)	80,321,840	82,713,851	81,480,540	82,630,663

12_Fair_Value_Details

12. Fair Value (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
	Rate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	$966,889,000	$707,600,000
Long-term Debt, Fair Value	$967,800,000
Derivative, Forward Interest Rate	1.44%
Debt Instrument, Basis Spread on Variable Rate	1.85%

13_Supplemental_Consolidating_2

13. Supplemental Consolidating Financial Data for Subsidiary Guarantors of the Unsecured Notes Supplemental Consolidating Balance Sheets (Details) (USD $)	Sep. 30, 2013		Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Supplemental Consolidating Statements Of Balance Sheets [Line Items]
Land	$75,956		$73,197
Buildings and improvements	2,420,123		2,315,499
Income producing property	2,496,079		2,388,696
Net income producing property	2,104,675		2,062,956
Construction in progress and land held for development	197,400	[1]	218,934
Net real estate	2,302,075		2,281,890
Cash and cash equivalents	198,196		23,578	14,716	14,402
Rents and other receivables	7,965		3,840
Deferred rent	148,440		144,829
Lease contracts above market value, net	9,429		10,255
Deferred costs, net	43,308		35,670
Prepaid expenses and other assets	42,137		30,797
Total assets	2,751,550		2,530,859
Mortgage notes payable	115,000		139,600
Unsecured Term Loan	120,000		0
Unsecured notes payable	731,889		550,000
Accounts payable and accrued liabilities	26,677		22,280
Construction costs payable	22,243		6,334
Accrued interest payable	4,651		2,601
Distribution payable	25,902		22,177
Lease contracts below market value, net	11,403		14,022
Prepaid rents and other liabilities	51,060		35,524
Total liabilities	1,108,825		810,538
Commitments and contingencies	0		0
Total liabilities and stockholders’ equity	2,751,550		2,530,859
DuPont Fabros Technology, L.P. [Member]
Supplemental Consolidating Statements Of Balance Sheets [Line Items]
Land	75,956		73,197
Buildings and improvements	2,420,123		2,315,499
Income producing property	2,496,079		2,388,696
Less: accumulated depreciation	-391,404		-325,740
Net income producing property	2,104,675		2,062,956
Construction in progress and land held for development	197,400		218,934
Net real estate	2,302,075		2,281,890
Cash and cash equivalents	193,900		19,282	14,420	10,097
Rents and other receivables	7,965		3,840
Deferred rent	148,440		144,829
Lease contracts above market value, net	9,429		10,255
Deferred costs, net	43,308		35,670
Investment in affiliates	0		0
Prepaid expenses and other assets	42,137		30,797
Total assets	2,747,254		2,526,563
Line of credit	0		18,000
Mortgage notes payable	115,000		139,600
Unsecured Term Loan	120,000		0
Unsecured notes payable	731,889		550,000
Accounts payable and accrued liabilities	26,677		22,280
Construction costs payable	22,243		6,334
Accrued interest payable	4,651		2,601
Distribution payable	25,902		22,177
Lease contracts below market value, net	11,403		14,022
Prepaid rents and other liabilities	51,060		35,524
Total liabilities	1,108,825		810,538
Redeemable partnership units	409,280		453,889
Commitments and contingencies	0		0
General Partners' Capital	8,985		9,525
Total partners’ capital	1,229,149		1,262,136
Total liabilities and stockholders’ equity	2,747,254		2,526,563
DuPont Fabros Technology, L.P. [Member] | Operating Partnership [Member]
Supplemental Consolidating Statements Of Balance Sheets [Line Items]
Land	0		0
Buildings and improvements	0		0
Income producing property	0		0
Less: accumulated depreciation	0		0
Net income producing property	0		0
Construction in progress and land held for development	0		0
Net real estate	0		0
Cash and cash equivalents	192,976		18,240	12,763	9,174
Rents and other receivables	4,059		15
Deferred rent	0		0
Lease contracts above market value, net	0		0
Deferred costs, net	19,624		10,711
Investment in affiliates	2,306,880		2,280,723
Prepaid expenses and other assets	2,073		2,101
Total assets	2,525,612		2,311,790
Line of credit	0		18,000
Mortgage notes payable	0		0
Unsecured Term Loan	120,000
Unsecured notes payable	731,889		550,000
Accounts payable and accrued liabilities	4,698		3,240
Construction costs payable	0		5
Accrued interest payable	4,645		2,290
Distribution payable	25,902		22,177
Lease contracts below market value, net	0		0
Prepaid rents and other liabilities	49		53
Total liabilities	887,183		595,765
Redeemable partnership units	409,280		453,889
Commitments and contingencies	0		0
General Partners' Capital	8,985		9,525
Total partners’ capital	1,229,149		1,262,136
Total liabilities and stockholders’ equity	2,525,612		2,311,790
DuPont Fabros Technology, L.P. [Member] | Subsidiary Guarantors [Member]
Supplemental Consolidating Statements Of Balance Sheets [Line Items]
Land	74,885		72,126
Buildings and improvements	2,317,597		2,210,314
Income producing property	2,392,482		2,282,440
Less: accumulated depreciation	-365,742		-302,745
Net income producing property	2,026,740		1,979,695
Construction in progress and land held for development	111,417		204,533
Net real estate	2,138,157		2,184,228
Cash and cash equivalents	0		361	1,259	196
Rents and other receivables	2,266		2,729
Deferred rent	141,901		135,937
Lease contracts above market value, net	9,429		10,255
Deferred costs, net	17,822		20,442
Investment in affiliates	0		0
Prepaid expenses and other assets	38,188		26,877
Total assets	2,347,763		2,380,829
Line of credit	0		0
Mortgage notes payable	0		139,600
Unsecured Term Loan	0
Unsecured notes payable	0		0
Accounts payable and accrued liabilities	18,760		16,312
Construction costs payable	3,991		6,100
Accrued interest payable	0		311
Distribution payable	0		0
Lease contracts below market value, net	11,403		14,022
Prepaid rents and other liabilities	47,865		32,478
Total liabilities	82,019		208,823
Redeemable partnership units	0		0
Commitments and contingencies	0		0
General Partners' Capital	0		0
Total partners’ capital	2,265,744		2,172,006
Total liabilities and stockholders’ equity	2,347,763		2,380,829
DuPont Fabros Technology, L.P. [Member] | Subsidiary Non-Guarantors [Member]
Supplemental Consolidating Statements Of Balance Sheets [Line Items]
Land	1,071		1,071
Buildings and improvements	102,526		105,185
Income producing property	103,597		106,256
Less: accumulated depreciation	-25,662		-22,995
Net income producing property	77,935		83,261
Construction in progress and land held for development	85,983		14,401
Net real estate	163,918		97,662
Cash and cash equivalents	924		681	398	727
Rents and other receivables	1,640		1,096
Deferred rent	6,539		8,892
Lease contracts above market value, net	0		0
Deferred costs, net	5,862		4,517
Investment in affiliates	0		0
Prepaid expenses and other assets	1,876		1,819
Total assets	180,759		114,667
Line of credit	0		0
Mortgage notes payable	115,000		0
Unsecured Term Loan	0
Unsecured notes payable	0		0
Accounts payable and accrued liabilities	3,219		2,728
Construction costs payable	18,252		229
Accrued interest payable	6		0
Distribution payable	0		0
Lease contracts below market value, net	0		0
Prepaid rents and other liabilities	3,146		2,993
Total liabilities	139,623		5,950
Redeemable partnership units	0		0
Commitments and contingencies	0		0
General Partners' Capital	0		0
Total partners’ capital	41,136		108,717
Total liabilities and stockholders’ equity	180,759		114,667
DuPont Fabros Technology, L.P. [Member] | Eliminations [Member]
Supplemental Consolidating Statements Of Balance Sheets [Line Items]
Land	0		0
Buildings and improvements	0		0
Income producing property	0		0
Less: accumulated depreciation	0		0
Net income producing property	0		0
Construction in progress and land held for development	0		0
Net real estate	0		0
Cash and cash equivalents	0		0	0	0
Rents and other receivables	0		0
Deferred rent	0		0
Lease contracts above market value, net	0		0
Deferred costs, net	0		0
Investment in affiliates	-2,306,880		-2,280,723
Prepaid expenses and other assets	0		0
Total assets	-2,306,880		-2,280,723
Line of credit	0		0
Mortgage notes payable	0		0
Unsecured Term Loan	0
Unsecured notes payable	0		0
Accounts payable and accrued liabilities	0		0
Construction costs payable	0		0
Accrued interest payable	0		0
Distribution payable	0		0
Lease contracts below market value, net	0		0
Prepaid rents and other liabilities	0		0
Total liabilities	0		0
Redeemable partnership units	0		0
Commitments and contingencies	0		0
General Partners' Capital	0		0
Total partners’ capital	-2,306,880		-2,280,723
Total liabilities and stockholders’ equity	-2,306,880		-2,280,723
DuPont Fabros Technology, L.P. [Member] | Series A Preferred Stock [Member]
Supplemental Consolidating Statements Of Balance Sheets [Line Items]
Limited Partners' Capital	185,000		185,000
DuPont Fabros Technology, L.P. [Member] | Series A Preferred Stock [Member] | Operating Partnership [Member]
Supplemental Consolidating Statements Of Balance Sheets [Line Items]
Limited Partners' Capital	185,000		185,000
DuPont Fabros Technology, L.P. [Member] | Series A Preferred Stock [Member] | Subsidiary Guarantors [Member]
Supplemental Consolidating Statements Of Balance Sheets [Line Items]
Limited Partners' Capital	0		0
DuPont Fabros Technology, L.P. [Member] | Series A Preferred Stock [Member] | Subsidiary Non-Guarantors [Member]
Supplemental Consolidating Statements Of Balance Sheets [Line Items]
Limited Partners' Capital	0		0
DuPont Fabros Technology, L.P. [Member] | Series A Preferred Stock [Member] | Eliminations [Member]
Supplemental Consolidating Statements Of Balance Sheets [Line Items]
Limited Partners' Capital	0		0
DuPont Fabros Technology, L.P. [Member] | Series B Preferred Stock [Member]
Supplemental Consolidating Statements Of Balance Sheets [Line Items]
Limited Partners' Capital	166,250		166,250
DuPont Fabros Technology, L.P. [Member] | Series B Preferred Stock [Member] | Operating Partnership [Member]
Supplemental Consolidating Statements Of Balance Sheets [Line Items]
Limited Partners' Capital	166,250		166,250
DuPont Fabros Technology, L.P. [Member] | Series B Preferred Stock [Member] | Subsidiary Guarantors [Member]
Supplemental Consolidating Statements Of Balance Sheets [Line Items]
Limited Partners' Capital	0		0
DuPont Fabros Technology, L.P. [Member] | Series B Preferred Stock [Member] | Subsidiary Non-Guarantors [Member]
Supplemental Consolidating Statements Of Balance Sheets [Line Items]
Limited Partners' Capital	0		0
DuPont Fabros Technology, L.P. [Member] | Series B Preferred Stock [Member] | Eliminations [Member]
Supplemental Consolidating Statements Of Balance Sheets [Line Items]
Limited Partners' Capital	0		0
DuPont Fabros Technology, L.P. [Member] | Limited partners' common units [Member]
Supplemental Consolidating Statements Of Balance Sheets [Line Items]
Limited Partners' Capital	868,914		901,361
DuPont Fabros Technology, L.P. [Member] | Limited partners' common units [Member] | Operating Partnership [Member]
Supplemental Consolidating Statements Of Balance Sheets [Line Items]
Limited Partners' Capital	868,914		901,361
DuPont Fabros Technology, L.P. [Member] | Limited partners' common units [Member] | Subsidiary Guarantors [Member]
Supplemental Consolidating Statements Of Balance Sheets [Line Items]
Limited Partners' Capital	2,265,744		2,172,006
DuPont Fabros Technology, L.P. [Member] | Limited partners' common units [Member] | Subsidiary Non-Guarantors [Member]
Supplemental Consolidating Statements Of Balance Sheets [Line Items]
Limited Partners' Capital	41,136		108,717
DuPont Fabros Technology, L.P. [Member] | Limited partners' common units [Member] | Eliminations [Member]
Supplemental Consolidating Statements Of Balance Sheets [Line Items]
Limited Partners' Capital	($2,306,880)		($2,280,723)
[1]	(1)Properties located in Ashburn, VA (ACC7 and ACC8); Piscataway, NJ (NJ1 Phase II), Elk Grove Village, IL (CH2) and Santa Clara, CA (SC1 Phase II and SC2).

13_Supplemental_Consolidating_3

13. Supplemental Consolidating Financial Data for Subsidiary Guarantors of the Unsecured Notes Supplemental Consolidating Statements of Operations (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenues:
Base rent	$63,281,000	$56,641,000	$185,474,000	$165,584,000
Recoveries from tenants	31,687,000	27,759,000	87,073,000	77,573,000
Other revenues	1,374,000	1,046,000	3,118,000	3,329,000
Total revenues	96,342,000	85,446,000	275,665,000	246,486,000
Expenses:
Property operating costs	27,119,000	24,524,000	75,398,000	70,360,000
Real estate taxes and insurance	3,630,000	4,631,000	10,944,000	9,215,000
Depreciation and amortization	23,538,000	22,531,000	69,773,000	66,885,000
General and administrative	3,664,000	3,973,000	12,546,000	13,714,000
Other expenses	874,000	734,000	2,231,000	2,146,000
Total expenses	58,825,000	56,393,000	170,892,000	162,320,000
Operating income	37,517,000	29,053,000	104,773,000	84,166,000
Interest income	32,000	33,000	85,000	112,000
Interest:
Expense incurred	-12,048,000	-11,934,000	-37,490,000	-36,471,000
Amortization of deferred financing costs	-849,000	-874,000	-2,542,000	-2,677,000
Loss on early extinguishment of debt	-30,610,000	0	-32,310,000	0
Net income	-5,958,000	16,278,000	32,516,000	45,130,000
Preferred stock dividends	-6,811,000	-6,811,000	-20,433,000	-20,241,000
Depreciation	22,200,000	21,300,000	66,400,000	63,300,000
DuPont Fabros Technology, L.P. [Member]
Revenues:
Base rent	63,281,000	56,641,000	185,474,000	165,584,000
Recoveries from tenants	31,687,000	27,759,000	87,073,000	77,573,000
Other revenues	1,374,000	1,046,000	3,118,000	3,329,000
Total revenues	96,342,000	85,446,000	275,665,000	246,486,000
Expenses:
Property operating costs	27,119,000	24,524,000	75,398,000	70,360,000
Real estate taxes and insurance	3,630,000	4,631,000	10,944,000	9,215,000
Depreciation and amortization	23,538,000	22,531,000	69,773,000	66,885,000
General and administrative	3,664,000	3,973,000	12,546,000	13,714,000
Other expenses	874,000	734,000	2,231,000	2,146,000
Total expenses	58,825,000	56,393,000	170,892,000	162,320,000
Operating income	37,517,000	29,053,000	104,773,000	84,166,000
Interest income	32,000	33,000	85,000	112,000
Interest:
Expense incurred	-12,048,000	-11,934,000	-37,490,000	-36,471,000
Amortization of deferred financing costs	-849,000	-874,000	-2,542,000	-2,677,000
Loss on early extinguishment of debt	-30,610,000	0	-32,310,000	0
Equity in earnings	0	0	0	0
Net income	-5,958,000	16,278,000	32,516,000	45,130,000
Preferred stock dividends	-6,811,000	-6,811,000	-20,433,000	-20,241,000
Net Income Loss Available To Common Unit holders Basic	-12,769,000	9,467,000	12,083,000	24,889,000
DuPont Fabros Technology, L.P. [Member] | Operating Partnership [Member]
Revenues:
Base rent	0	0	0	0
Recoveries from tenants	3,940,000	3,517,000	11,317,000	10,226,000
Other revenues	0	0	0	0
Total revenues	3,940,000	3,517,000	11,317,000	10,226,000
Expenses:
Property operating costs	0	0	0	0
Real estate taxes and insurance	0	0	0	0
Depreciation and amortization	18,000	28,000	64,000	90,000
General and administrative	3,534,000	3,406,000	12,039,000	11,807,000
Other expenses	161,000	119,000	600,000	135,000
Total expenses	3,713,000	3,553,000	12,703,000	12,032,000
Operating income	227,000	-36,000	-1,386,000	-1,806,000
Interest income	32,000	109,000	-200,000	299,000
Interest:
Expense incurred	-12,467,000	-11,889,000	-36,731,000	-35,608,000
Amortization of deferred financing costs	-820,000	-682,000	-2,206,000	-2,069,000
Loss on early extinguishment of debt	-30,610,000		-30,610,000
Equity in earnings	37,680,000	28,776,000	103,649,000	84,314,000
Net income	-5,958,000	16,278,000	32,516,000	45,130,000
Preferred stock dividends	-6,811,000	-6,811,000	-20,433,000	-20,241,000
Net Income Loss Available To Common Unit holders Basic	-12,769,000	9,467,000	12,083,000	24,889,000
DuPont Fabros Technology, L.P. [Member] | Subsidiary Guarantors [Member]
Revenues:
Base rent	59,343,000	52,188,000	173,651,000	152,222,000
Recoveries from tenants	28,776,000	24,519,000	79,315,000	68,348,000
Other revenues	382,000	305,000	1,191,000	903,000
Total revenues	88,501,000	77,012,000	254,157,000	221,473,000
Expenses:
Property operating costs	28,314,000	24,968,000	79,433,000	71,827,000
Real estate taxes and insurance	3,480,000	4,491,000	10,572,000	8,800,000
Depreciation and amortization	22,380,000	21,154,000	66,424,000	62,757,000
General and administrative	21,000	21,000	78,000	97,000
Other expenses	0	0	296,000	0
Total expenses	54,195,000	50,634,000	156,803,000	143,481,000
Operating income	34,306,000	26,378,000	97,354,000	77,992,000
Interest income	0	0	20,000	0
Interest:
Expense incurred	420,000	-45,000	-595,000	-863,000
Amortization of deferred financing costs	22,000	-192,000	-222,000	-608,000
Loss on early extinguishment of debt	0		-1,700,000
Equity in earnings	0	0	0	0
Net income	34,748,000	26,141,000	94,857,000	76,521,000
Preferred stock dividends	0	0	0	0
Net Income Loss Available To Common Unit holders Basic	34,748,000	26,141,000	94,857,000	76,521,000
DuPont Fabros Technology, L.P. [Member] | Subsidiary Non-Guarantors [Member]
Revenues:
Base rent	3,976,000	4,491,000	11,936,000	13,475,000
Recoveries from tenants	2,911,000	3,240,000	7,758,000	9,225,000
Other revenues	1,037,000	786,000	2,046,000	2,537,000
Total revenues	7,924,000	8,517,000	21,740,000	25,237,000
Expenses:
Property operating costs	2,790,000	3,118,000	7,401,000	8,870,000
Real estate taxes and insurance	150,000	140,000	372,000	415,000
Depreciation and amortization	1,140,000	1,349,000	3,285,000	4,038,000
General and administrative	109,000	546,000	429,000	1,810,000
Other expenses	751,000	653,000	1,448,000	2,124,000
Total expenses	4,940,000	5,806,000	12,935,000	17,257,000
Operating income	2,984,000	2,711,000	8,805,000	7,980,000
Interest income	0	0	0	0
Interest:
Expense incurred	-1,000	-76,000	101,000	-187,000
Amortization of deferred financing costs	-51,000	0	-114,000	0
Loss on early extinguishment of debt	0		0
Equity in earnings	0	0	0	0
Net income	2,932,000	2,635,000	8,792,000	7,793,000
Preferred stock dividends	0	0	0	0
Net Income Loss Available To Common Unit holders Basic	2,932,000	2,635,000	8,792,000	7,793,000
DuPont Fabros Technology, L.P. [Member] | Eliminations [Member]
Revenues:
Base rent	-38,000	-38,000	-113,000	-113,000
Recoveries from tenants	-3,940,000	-3,517,000	-11,317,000	-10,226,000
Other revenues	-45,000	-45,000	-119,000	-111,000
Total revenues	-4,023,000	-3,600,000	-11,549,000	-10,450,000
Expenses:
Property operating costs	-3,985,000	-3,562,000	-11,436,000	-10,337,000
Real estate taxes and insurance	0	0	0	0
Depreciation and amortization	0	0	0	0
General and administrative	0	0	0	0
Other expenses	-38,000	-38,000	-113,000	-113,000
Total expenses	-4,023,000	-3,600,000	-11,549,000	-10,450,000
Operating income	0	0	0	0
Interest income	0	-76,000	265,000	-187,000
Interest:
Expense incurred	0	76,000	-265,000	187,000
Amortization of deferred financing costs	0	0	0	0
Loss on early extinguishment of debt	0		0
Equity in earnings	-37,680,000	-28,776,000	-103,649,000	-84,314,000
Net income	-37,680,000	-28,776,000	-103,649,000	-84,314,000
Preferred stock dividends	0	0	0	0
Net Income Loss Available To Common Unit holders Basic	($37,680,000)	($28,776,000)	($103,649,000)	($84,314,000)

13_Supplemental_Consolidating_4

13. Supplemental Consolidating Financial Data for Subsidiary Guarantors of the Unsecured Notes Supplemental Consodlidating Statements of Cash Flows (Details) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Supplemental Consolidating Statements Of Cash Flows [Line Items]
Net Cash Provided by (Used in) Operating Activities	$140,650	$102,740
Investments in real estate – development	-50,164	-82,754
Payments to Acquire Land	-14,186	0
Interest capitalized for real estate under development	-1,522	-2,654
Improvements to real estate	-5,035	-3,333
Additions to non-real estate property	-24	-55
Net cash used in investing activities	-70,931	-88,796
Proceeds from line of credit	102,000	15,000
Repayments of line of credit	-120,000	-35,000
Proceeds from mortgage notes payable	115,000	0
Lump sum payoffs of mortgage notes payable	-138,300	0
Repayments of Secured Debt	-1,300	-3,900
Proceeds from Issuance of Unsecured Debt	120,000	0
Proceeds from Unsecured Notes Payable	600,000	0
Repayments of Unsecured Debt	-418,111	0
Payments of financing costs	-18,073	-2,084
Payments of Debt Extinguishment Costs	-25,462	0
Exercises of stock options	61	868
Payments for Repurchase of Common Stock	-37,792	0
Net cash provided by financing activities	104,899	-13,630
Net increase (decrease) in cash and cash equivalents	174,618	314
Cash and cash equivalents, beginning	23,578	14,402
Cash and cash equivalents, ending	198,196	14,716
DuPont Fabros Technology, L.P. [Member]
Supplemental Consolidating Statements Of Cash Flows [Line Items]
Net Cash Provided by (Used in) Operating Activities	140,650	102,740
Investments in real estate – development	-50,164	-82,754
Payments to Acquire Land	-14,186	0
Investments in affiliates	0	0
Interest capitalized for real estate under development	-1,522	-2,654
Improvements to real estate	-5,035	-3,333
Additions to non-real estate property	-24	-55
Net cash used in investing activities	-70,931	-88,796
Proceeds from line of credit	102,000	15,000
Repayments of line of credit	-120,000	-35,000
Proceeds from mortgage notes payable	115,000	0
Lump sum payoffs of mortgage notes payable	-138,300	0
Repayments of Secured Debt	-1,300	-3,900
Proceeds from Issuance of Unsecured Debt	120,000	0
Proceeds from Unsecured Notes Payable	600,000	0
Repayments of Unsecured Debt	-418,111	0
Payments of financing costs	-18,073	-2,084
Issuance of preferred units, net of offering costs		62,694
Payments of Debt Extinguishment Costs	-25,462	0
Exercises of stock options	61	868
Payments for Repurchase of Common Stock	-37,792	0
Proceeds from Related Party Debt	0	4,000
Payments of Distributions to Affiliates	-73,124	-51,199
Net cash provided by financing activities	104,899	-9,621
Net increase (decrease) in cash and cash equivalents	174,618	4,323
Cash and cash equivalents, beginning	19,282	10,097
Cash and cash equivalents, ending	193,900	14,420
DuPont Fabros Technology, L.P. [Member] | Operating Partnership [Member]
Supplemental Consolidating Statements Of Cash Flows [Line Items]
Net Cash Provided by (Used in) Operating Activities	-36,793	-37,301
Investments in real estate – development	-8	-25
Payments to Acquire Land	0
Investments in affiliates	80,340	46,653
Interest capitalized for real estate under development	0	0
Improvements to real estate	0	0
Additions to non-real estate property	-6	-17
Net cash used in investing activities	80,326	46,611
Proceeds from line of credit	102,000	15,000
Repayments of line of credit	-120,000	-35,000
Proceeds from mortgage notes payable	0
Lump sum payoffs of mortgage notes payable	0
Repayments of Secured Debt	0	0
Proceeds from Issuance of Unsecured Debt	120,000
Proceeds from Unsecured Notes Payable	600,000
Repayments of Unsecured Debt	-418,111
Payments of financing costs	-16,369	-2,084
Issuance of preferred units, net of offering costs		62,694
Payments of Debt Extinguishment Costs	-25,462
Exercises of stock options	61	868
Payments for Repurchase of Common Stock	-37,792
Proceeds from Related Party Debt		4,000
Payments of Distributions to Affiliates	-73,124	-51,199
Net cash provided by financing activities	131,203	-5,721
Net increase (decrease) in cash and cash equivalents	174,736	3,589
Cash and cash equivalents, beginning	18,240	9,174
Cash and cash equivalents, ending	192,976	12,763
DuPont Fabros Technology, L.P. [Member] | Subsidiary Guarantors [Member]
Supplemental Consolidating Statements Of Cash Flows [Line Items]
Net Cash Provided by (Used in) Operating Activities	165,509	129,718
Investments in real estate – development	-27,469	-73,359
Payments to Acquire Land	0
Investments in affiliates	6,545	-45,398
Interest capitalized for real estate under development	-453	-2,654
Improvements to real estate	-4,871	-3,306
Additions to non-real estate property	-18	-38
Net cash used in investing activities	-26,266	-124,755
Proceeds from line of credit	0	0
Repayments of line of credit	0	0
Proceeds from mortgage notes payable	0
Lump sum payoffs of mortgage notes payable	-138,300
Repayments of Secured Debt	-1,300	-3,900
Proceeds from Issuance of Unsecured Debt	0
Proceeds from Unsecured Notes Payable	0
Repayments of Unsecured Debt	0
Payments of financing costs	-4	0
Issuance of preferred units, net of offering costs		0
Payments of Debt Extinguishment Costs	0
Exercises of stock options	0	0
Payments for Repurchase of Common Stock	0
Proceeds from Related Party Debt		0
Payments of Distributions to Affiliates	0	0
Net cash provided by financing activities	-139,604	-3,900
Net increase (decrease) in cash and cash equivalents	-361	1,063
Cash and cash equivalents, beginning	361	196
Cash and cash equivalents, ending	0	1,259
DuPont Fabros Technology, L.P. [Member] | Subsidiary Non-Guarantors [Member]
Supplemental Consolidating Statements Of Cash Flows [Line Items]
Net Cash Provided by (Used in) Operating Activities	11,934	10,323
Investments in real estate – development	-22,687	-9,370
Payments to Acquire Land	-14,186
Investments in affiliates	-86,885	-1,255
Interest capitalized for real estate under development	-1,069	0
Improvements to real estate	-164	-27
Additions to non-real estate property	0	0
Net cash used in investing activities	-124,991	-10,652
Proceeds from line of credit	0	0
Repayments of line of credit	0	0
Proceeds from mortgage notes payable	115,000
Lump sum payoffs of mortgage notes payable	0
Repayments of Secured Debt	0	0
Proceeds from Issuance of Unsecured Debt	0
Proceeds from Unsecured Notes Payable	0
Repayments of Unsecured Debt	0
Payments of financing costs	-1,700	0
Issuance of preferred units, net of offering costs		0
Payments of Debt Extinguishment Costs	0
Exercises of stock options	0	0
Payments for Repurchase of Common Stock	0
Proceeds from Related Party Debt		0
Payments of Distributions to Affiliates	0	0
Net cash provided by financing activities	113,300	0
Net increase (decrease) in cash and cash equivalents	243	-329
Cash and cash equivalents, beginning	681	727
Cash and cash equivalents, ending	924	398
DuPont Fabros Technology, L.P. [Member] | Eliminations [Member]
Supplemental Consolidating Statements Of Cash Flows [Line Items]
Net Cash Provided by (Used in) Operating Activities	0	0
Investments in real estate – development	0	0
Payments to Acquire Land	0
Investments in affiliates	0	0
Interest capitalized for real estate under development	0	0
Improvements to real estate	0	0
Additions to non-real estate property	0	0
Net cash used in investing activities	0	0
Proceeds from line of credit	0	0
Repayments of line of credit	0	0
Proceeds from mortgage notes payable	0
Lump sum payoffs of mortgage notes payable	0
Repayments of Secured Debt	0	0
Proceeds from Issuance of Unsecured Debt	0
Proceeds from Unsecured Notes Payable	0
Repayments of Unsecured Debt	0
Payments of financing costs	0	0
Issuance of preferred units, net of offering costs		0
Payments of Debt Extinguishment Costs	0
Exercises of stock options	0	0
Payments for Repurchase of Common Stock	0
Proceeds from Related Party Debt		0
Payments of Distributions to Affiliates	0	0
Net cash provided by financing activities	0	0
Net increase (decrease) in cash and cash equivalents	0	0
Cash and cash equivalents, beginning	0	0
Cash and cash equivalents, ending	$0	$0