PotlatchDeltic (PCH) 10-K 13 Feb 15 2014 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information Document (USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Jan. 31, 2015	Jun. 30, 2014
Entity Information [Line Items]
Entity Registrant Name	POTLATCH CORP
Entity Central Index Key	1338749
Current Fiscal Year End Date	-19
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	31-Dec-14
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Amendment Flag	FALSE
Entity Common Stock, Shares Outstanding		40,605,179
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$1,680.50

Consolidated_Condensed_Stateme

Consolidated Condensed Statements of Income (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Revenues	$606,950		$570,289		$525,134
Costs and expenses:
Cost of goods sold1	429,789	[1]	408,772	[1]	390,773	[1]
Selling, general and administrative expenses	44,655		50,397		49,419
Environmental remediation charges	0		3,522		0
Total costs and expenses	474,444		462,691		440,192
Operating income	132,506		107,598		84,942
Interest expense, net	-22,909		-23,132		-25,539
Income before income taxes	109,597		84,466		59,403
Income taxes	-19,687		-13,885		-16,809
Net income	89,910		70,581		42,594
Net income per share:
Basic (in dollars per share)	$2.21		$1.74		$1.06
Diluted (in dollars per share)	$2.20		$1.73		$1.05
Distributions per share (in dollars per share)	$1.43		$1.28		$1.24
Asset impairment charge					$107
[1]	A 2012 asset impairment charge of $107 was reclassified to cost of goods sold.

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net income	$89,910	$70,581	$42,594
Other comprehensive income (loss), net of tax:
Net gain (loss) arising during the period, net of tax expense (benefit) of $(15,598), $21,424 and $(5,968)	-24,396	33,510	-9,334
Prior service credit arising during the period, net of tax expense of $0, $0 and $2,159	0	0	3,273
Amortization of actuarial loss included in net periodic cost, net of tax expense of $6,488, $9,024 and $7,208	10,149	14,114	11,275
Amortization of prior service credit included in net periodic cost, net of tax benefit of $(3,468), $(3,482) and $(3,343)	-5,425	-5,446	-5,230
Other comprehensive income (loss), net of tax	-19,672	42,178	-16
Comprehensive income	$70,238	$112,759	$42,578

Consolidated_Statements_of_Com1

Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net gain (loss) arising during the period, Tax	($15,598)	$21,424	($5,968)
Prior service (cost) credit arising during the period, tax	0	0	2,159
Amortization of actuarial loss included in net periodic cost, tax	6,488	9,024	7,208
Amortization of prior service credit included in net periodic cost, tax	($3,468)	($3,482)	($3,343)

Consolidated_Condensed_Balance

Consolidated Condensed Balance Sheets (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Current assets:
Cash	$4,644	$5,586
Short-term investments	26,368	52,251
Receivables, net of allowance for doubtful accounts of $450	9,928	16,572
Inventories	31,490	36,275
Deferred tax assets	6,168	7,724
Other assets	15,065	11,961
Total current assets	93,663	130,369
Property, plant and equipment, net	65,749	59,976
Timber and timberlands, net	828,420	455,871
Deferred tax assets	37,228	21,576
Other assets	10,361	12,738
Total assets	1,035,421	680,530
Current liabilities:
Current portion of long-term debt	22,870	0
Current liability for pensions and other postretirement employee benefits	6,260	6,701
Accounts payable and accrued liabilities	43,064	43,617
Total current liabilities	72,194	50,318
Long-term debt	606,473	320,092
Liability for pensions and other postretirement employee benefits	115,936	83,619
Other long-term obligations	15,752	22,353
Total liabilities	810,355	476,382
Stockholders’ equity:
Preferred stock, authorized 4,000,000 shares, no shares issued	0	0
Common stock, $1 par value, authorized 100,000,000 shares, issued 40,605,179 and 40,536,879 shares	40,605	40,537
Additional paid-in capital	346,441	337,887
Accumulated deficit	-43,588	-75,556
Accumulated other comprehensive loss, net of tax of $(77,586) and $(64,868)	-118,392	-98,720
Total stockholders’ equity	225,066	204,148
Total liabilities and stockholders' equity	$1,035,421	$680,530

Consolidated_Condensed_Balance1

Consolidated Condensed Balance Sheets (Parentheticals) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Allowance for doubtful accounts	$450	$450
Preferred stock, authorized	4,000,000	4,000,000
Preferred stock, issued	0	0
Common stock, par value	$1	$1
Common stock, authorized	100,000,000	100,000,000
Common stock, issued	40,605,179	40,536,879
Accumulated other comprehensive loss, tax	($77,586)	($64,868)

Consolidated_Condensed_Stateme1

Consolidated Condensed Statements of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$89,910		$70,581		$42,594
Adjustments to reconcile net income to net cash from operating activities:
Depreciation, depletion and amortization	26,749		26,962		26,247
Basis of real estate sold	8,646		2,904		5,048
Change in deferred taxes	-1,616		-2,467		15,992
Employee benefit plans	2,122		7,561		4,317
Employee equity-based compensation expense	4,137		4,377		4,067
Other, net	-2,191		-1,972		599
Change in receivables	7,016		-5,904		2,865
Change in inventories	4,785		-7,347		-325
Change in other assets	-1,421		1,668		-1,459
Change in accounts payable and accrued liabilities	-2,388		-3,468		163
Funding of qualified pension plans	-3,550		0		-21,630
Timber deposits and cost share roads	-827		-2,643		1,503
Net cash from operating activities	131,372		90,252		79,981
CASH FLOWS FROM INVESTING ACTIVITIES
Change in short-term investments	25,883		10,826		-88
Transfer from company owned life insurance (COLI)	28,870		0		21,751
Transfer to COLI	-25,515		0		0
Property, plant and equipment	-13,261		-10,280		-5,636
Timberlands reforestation and roads1	-10,971	[1]	-12,313	[1]	-11,774	[1]
Timberlands reforestation and roads1	-388,952	[1]	-1,060	[1]	-11,778	[1]
Other, net	1,263		823		-1,122
Net cash from investing activities	-382,683		-12,004		-8,647
CASH FLOWS FROM FINANCING ACTIVITIES
Distributions to common stockholders	-57,848		-51,868		-50,041
Repayment of long-term debt	0		-36,663		-21,662
Proceeds from issuance of long-term debt	310,000		0		12,000
Issuance of common stock	398		1,904		1,075
Change in book overdrafts	1,465		-955		462
Deferred financing costs	-2,388		-25		-2,148
Employee tax withholdings on vested performance share awards	-1,104		-1,738		-1,714
Other, net	-154		-302		-140
Net cash from financing activities	250,369		-89,647		-62,168
Increase (decrease) in cash	-942		-11,399		9,166
Cash at beginning of year	5,586		16,985		7,819
Cash at end of year	4,644		5,586		16,985
Cash paid during the year for:
Interest	20,918		22,229		23,884
Income taxes, net	$18,104		$20,097		$53
[1]	Acquisitions of timber and timberlands in 2013 and 2012 were reclassified in order to conform to the 2014 presentation.

Consolidated_Statements_of_Sto

Consolidated Statements of Stockholders' Equity (USD $)	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
In Thousands, except Share data, unless otherwise specified
Balance, beginning of period at Dec. 31, 2011	$142,138	$40,202	$329,206	($86,388)	($140,882)
Balance, beginning of period (shares) at Dec. 31, 2011		40,202,170
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options and stock awards (shares)	60,857	60,857
Exercise of stock options and stock awards	1,092	61	1,031	0	0
Performance share and restricted stock unit awards (shares)		126,153
Performance share and restricted stock unit awards	2,861	126	3,096	-361	0
Net income	42,594	0	0	42,594	0
Pension plans and OPEB obligations	-16	0	0	0	-16
Transfer of assets from REIT to subsidiary	15	0	15	0	0
Common distributions, $1.24 per share 2012, $1.28 per share 2013, $1.425 per share 2014	-50,041	0	0	-50,041	0
Balance, end of period at Dec. 31, 2012	138,643	40,389	333,348	-94,196	-140,898
Balance, end of period (shares) at Dec. 31, 2012		40,389,180
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options and stock awards (shares)	70,968	70,968
Exercise of stock options and stock awards	1,904	71	1,833	0	0
Performance share and restricted stock unit awards (shares)		76,731
Performance share and restricted stock unit awards	2,710	77	2,706	-73	0
Net income	70,581	0	0	70,581	0
Pension plans and OPEB obligations	42,178	0	0	0	42,178
Common distributions, $1.24 per share 2012, $1.28 per share 2013, $1.425 per share 2014	-51,868	0	0	-51,868	0
Balance, end of period at Dec. 31, 2013	204,148	40,537	337,887	-75,556	-98,720
Balance, end of period (shares) at Dec. 31, 2013		40,536,879
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options and stock awards (shares)	12,859	12,859
Exercise of stock options and stock awards	398	13	385	0	0
Performance share and restricted stock unit awards (shares)		55,441
Performance share and restricted stock unit awards	2,935	55	2,974	-94	0
Net income	89,910	0	0	89,910	0
Director deferred stock awards	5,195	0	5,195	0	0
Pension plans and OPEB obligations	-19,672	0	0	0	-19,672
Common distributions, $1.24 per share 2012, $1.28 per share 2013, $1.425 per share 2014	-57,848	0	0	-57,848	0
Balance, end of period at Dec. 31, 2014	$225,066	$40,605	$346,441	($43,588)	($118,392)
Balance, end of period (shares) at Dec. 31, 2014		40,605,179

Consolidated_Statements_of_Sto1

Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Common distributions, per share	$1.43	$1.28	$1.24

Summary_of_Principal_Accountin

Summary of Principal Accounting Policies	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Summary of Principle Accounting Policies	SUMMARY OF PRINCIPAL ACCOUNTING POLICIES
	CONSOLIDATION
	The Consolidated Financial Statements include the accounts of Potlatch Corporation and its subsidiaries after elimination of significant intercompany transactions and accounts. There are no significant unconsolidated subsidiaries.
	We are primarily engaged in activities associated with timberland management, including the sale of timber, the management of approximately 1.6 million acres of timberlands and the purchase and sale of timberlands. We are also engaged in the manufacture and sale of wood products. Our timberlands and all of our wood products facilities are located within the continental United States. The primary market for our products is the United States. We converted to a Real Estate Investment Trust (REIT) effective January 1, 2006.
	SIGNIFICANT ESTIMATES
	The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America, which we refer to in this report as U.S. GAAP, requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates and assumptions.
	Significant estimates are described in further detail in the Notes to Consolidated Financial Statements. Significant estimates include timber volumes, assumptions utilized for asset and disposal group impairment tests, income projections and tax planning strategies used to support realization of deferred tax assets, environmental liabilities, pension and postretirement obligation assumptions and fair value of derivative instruments.
	EQUITY-BASED COMPENSATION
	Equity-based awards are measured at fair value on the dates they are granted or modified. These measurements establish the cost of the equity-based awards for accounting purposes. The cost of the equity-based award is then recognized in the Consolidated Statements of Income over each employee’s required service period. See Note 15: Equity-Based Compensation Plans for more information about our equity-based compensation.
	INVENTORIES
	Inventories are stated at the lower of cost or market. The last-in, first-out method is used to determine cost of logs, lumber and plywood for most of our operations. The average cost method is used to determine cost of all other inventories. Expenses associated with idle capacity or other curtailments of production are reflected in cost of goods sold in the periods incurred.
	PROPERTY, PLANT AND EQUIPMENT
	Property, plant and equipment are valued at cost less accumulated depreciation. Depreciation of buildings, equipment and other depreciable assets is determined using the straight-line method of depreciation. Estimated useful lives range from 30 to 40 years for buildings and structures and 2 to 25 years for equipment.
	Major improvements and replacements of property are capitalized. Maintenance, repairs, and minor improvements and replacements are expensed. Upon retirement or other disposition of property, applicable cost and accumulated depreciation or amortization are removed from the accounts. Any gains or losses are included in earnings.
	TIMBER AND TIMBERLANDS
	Timber and timberlands are valued at cost less accumulated depletion and amortization. For fee timber, the capitalized cost includes costs related to stand establishment, including costs of preparing the land for planting, cost of seeds or seedlings, and tree planting, including labor, materials, depreciation of company-owned equipment and the cost of contract services. Upon completion of planting activities and field inspection to assure the planting operation was successful, a plantation will be considered “established.” Subsequent expenditures made to maintain the integrity or enhance the growth of an established plantation or stand are expensed. Post-establishment expenses include release spray treatments, pest control activities, thinning operations, fertilization and replanting seedlings lost through mortality. Expenditures for forest management consist of regularly recurring items necessary for ownership and administration of timber producing property such as fire protection, property taxes and insurance, silviculture costs incurred subsequent to stand establishment, cruising (physical inventory), property maintenance and salaries, supplies, travel, record-keeping and other normal recurring administrative personnel costs. These expenditures are accounted for as current operating expenses. Timberland acquisitions are capitalized and the cost is allocated to timberland, merchantable sawlogs, merchantable pulpwood, reproduction (young growth not merchantable), logging roads and other land improvements, generally based on relative appraised values.
	The aggregate estimated volume of current standing merchantable timber inventory is updated at least annually to reflect increases due to reclassification of young growth to merchantable timber when the young growth meets defined diameter specifications, the annual growth of merchantable timber and the acquisition of additional merchantable timber, and to reflect decreases due to timber harvests and land sales. Timber volumes are estimated from cruises of the timber tracts, which are completed on our timberlands on approximately a five to ten year cycle. Since the individual cruises collect field data at different times for specific sites, the growth model projects standing inventory from the cruise date to a common reporting date. Annual growth rates for the merchantable inventory have historically been in the range of 2%-5% in the North and 6%-9% in the South.
	Depletion represents the amount charged to expense as fee timber is harvested. Rates at which timber is depleted are calculated annually for each of our Resource regions by dividing the beginning of year balance of the timber accounts by the forest inventory volume, after inventory updates for growth projection adjustments and new timber cruises.
	The base cost of logging roads, such as the clearing, grading, and ditching, is not amortized and remains a capitalized item until obliteration or other disposition, while other portions of the initial cost, such as bridges, culverts and gravel surfacing are amortized over their useful lives, which range from 5 to 20 years. Costs associated with temporary logging roads that will not remain part of our road system are expensed as incurred.
	REAL ESTATE SALES
	Sales of non-core timberland are considered to be part of our normal operations. We therefore classify revenue and costs associated with real estate sold in revenues and cost of goods sold, respectively, in our Consolidated Statements of Income. Cash generated from real estate sales is included as an operating activity in our Consolidated Statements of Cash Flows.
	LIKE-KIND EXCHANGES AND RESTRICTED CASH
	In order to acquire and sell assets, primarily timberlands, in a tax efficient manner, we sometimes enter into like-kind exchange (LKE) tax-deferred transactions. There are two main types of LKE transactions: forward transactions, in which property is sold and the proceeds are reinvested by acquiring similar property; and reverse
	transactions, in which property is acquired and similar property is subsequently sold by us. Both forward and reverse transactions must be completed within prescribed time periods under Internal Revenue Code section 1031.
	We use a qualified intermediary to facilitate LKE transactions. Proceeds from forward transactions are held by the intermediary and are classified as restricted cash within non-current other assets, because we intend to reinvest the the funds in similar properties. If the acquisition of suitable LKE properties is not completed within 180 days of the sale of the company-owned property, the proceeds are distributed to us by the intermediary and are reclassified as available cash and applicable income taxes are determined. In the case of reverse transactions in which we have not yet completed LKE sales of company-owned land to match with property purchased on our behalf by the intermediary, the amount associated with the property purchased on our behalf but not yet matched with LKE sales is classified as a non-current asset and included in “Timber and timberlands, net” in our Consolidated Balance Sheets and as “Additions to timber and timberlands” in the investing activities section of our Consolidated Statements of Cash Flows.
	LONG-LIVED ASSETS
	Our long-lived assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable, as measured by its undiscounted estimated future cash flows. We use our operational budgets to estimate future cash flows. The estimates are adjusted periodically to reflect changing business conditions. Impaired assets are written down to fair value. Assets to be disposed of are reported at the lower of carrying amount or fair value less cost to sell.
	We recognize a liability and an asset equal to the fair value of our legal obligations to perform asset retirement activities if the amount can be reasonably estimated. Our primary obligations relate to asbestos located within our manufacturing facilities and a landfill site. We have recorded assets and corresponding liabilities that are not material to our financial position or results of operations. We have also identified situations that would have resulted in the recognition of additional asset retirement obligations, except for an inability to reasonably estimate the fair value of the liability. Most of these situations relate to asbestos located within our manufacturing facilities where a settlement date or range of settlement dates cannot be specified. We review these obligations annually and do not expect them to have a material effect on our financial position, results of operations or cash flows.
	INCOME TAXES
	We use the asset and liability method of accounting for income taxes. Under this method, deferred tax assets and liabilities are recognized for the estimated future tax consequences attributable to differences between the financial statement carrying amounts of assets and liabilities and their respective tax bases, operating loss carryforwards and tax credit carryforwards. Deferred tax assets and liabilities are measured pursuant to tax laws using rates expected to apply to taxable income in the years in which the temporary differences are expected to be recovered or settled. We recognize the effect of a change in income tax rates on deferred tax assets and liabilities in the Consolidated Statements of Income and Consolidated Statements of Comprehensive Income in the period that includes the enactment date of the rate change. We record a valuation allowance to reduce the carrying amounts of deferred tax assets if it is more likely than not that such deferred tax assets will not be realized.
	REVENUE RECOGNITION
	We recognize revenue from the sale of timber when risk of loss transfers to the buyer and the quantity sold is determinable. These sales take the form of delivered logs, pay-as-cut contracts, timber deeds and lump sum contracts. On delivered log sales, revenue, which includes amounts billed for logging and hauling, is recognized at the point that logs are delivered and scaled. Revenue is recognized on timber deeds and lump sum contracts generally upon closing or when the contracts are effective, which is the point at which the buyer assumes risk of loss associated with the standing timber.
	We receive cash consideration in full and recognize revenue at closing on substantially all our real estate sales.
	We recognize revenue from the sale of manufactured wood products and residual by-products when there is persuasive evidence of a sales agreement, the price to the customer is fixed and determinable, collection is reasonably assured, and title and the risk of loss passes to the customer. Shipping terms generally indicate when title and the risk of loss have passed. Revenue is recognized at shipment for sales when shipping terms are FOB (free on board) shipping point. For sales where shipping terms are FOB destination, revenue is recognized when the goods are received by the customer.
	Revenue is recognized net of any sales taxes collected. Sales taxes, when collected, are recorded as a current liability and remitted to the appropriate governmental entities.
	PROSPECTIVE ACCOUNTING PRONOUNCEMENTS
	In May 2014, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2014-09, Revenue from Contracts with Customers. This update was issued as Accounting Standards Codification Topic 606. The core principle of this amendment is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. ASU 2014-09 is effective for annual reporting periods beginning after December 15, 2016, including interim periods within that reporting period, with earlier adoption not permitted. The guidance permits two implementation approaches, one requiring retrospective application of the new standard with restatement of prior years and one requiring prospective application of the new standard with disclosure of results under old standards. The adoption of this guidance is not expected to have a significant effect on our consolidated financial statements.
	SHIPPING AND HANDLING COSTS
	Costs for shipping and handling are included in cost of goods sold in our Consolidated Statements of Income.

Earnings_per_Share

Earnings per Share	12 Months Ended
	Dec. 31, 2014
Earnings Per Share, Basic, Other Disclosures [Abstract]
Earnings per Share	EARNINGS PER SHARE
	The following table reconciles the number of shares used in calculating the basic and diluted earnings per share for the years ended December 31:
	(Dollars in thousands, except per-share amounts)	2014		2013		2012
	Net income	$	89,910	$	70,581	$	42,594
	Basic weighted-average shares outstanding	40,748,924		40,502,878		40,333,333
	Incremental shares due to:
	Performance shares	117,830		133,766		134,079
	Restricted stock units	27,628		69,076		70,217
	Stock options	—		3,567		15,520
	Diluted weighted-average shares outstanding	40,894,382		40,709,287		40,553,149
	Basic net income per share	$	2.21	$	1.74	$	1.06
	Diluted net income per share	$	2.2	$	1.73	$	1.05
	Anti-dilutive shares excluded from the calculation:
	Performance shares	—		3,441		—
	Restricted stock units	1,216		—		315
	Total anti-dilutive shares excluded from the calculation	1,216		3,441		315

Shortterm_Investments

Short-term Investments	12 Months Ended
	Dec. 31, 2014
Short-term Investments [Abstract]
Short-term Investments	SHORT-TERM INVESTMENTS
	Our short-term investments consist of diversified depository accounts, money market funds and variable rate demand obligations, all of which have very short maturity periods and therefore earn an interest rate commensurate with low-risk instruments. We classify our short-term investments as "available for sale" and there is no significant difference between cost and fair value. We do not attempt to hedge our exposure to interest rate risk for our short-term investments. All short-term investments of REIT funds are made in compliance with the requirements of the Internal Revenue Code with respect to qualifying REIT investments.

Inventories

Inventories	12 Months Ended
	Dec. 31, 2014
Inventory Disclosure [Abstract]
Inventories	INVENTORIES
	(Dollars in thousands)	2014		2013
	Logs	$	7,930	$	14,975
	Lumber and other manufactured wood products	17,286		15,967
	Materials and supplies	6,274		5,333
		$	31,490	$	36,275
	Valued at lower of cost or market:
	Last-in, first-out basis	$	16,874	$	23,250
	Average cost basis	14,616		13,025
	Total inventories	$	31,490	$	36,275
	If the last-in, first-out inventory had been carried at average cost, the values would have been approximately $11.0 million, $11.3 million, and $10.6 million higher at December 31, 2014, 2013, and 2012, respectively.

Property_Plant_and_Equipment

Property, Plant and Equipment	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	PROPERTY, PLANT AND EQUIPMENT
	(Dollars in thousands)	2014			2013
	Land and land improvements	$	18,374		$	17,201
	Buildings and structures	36,174			33,985
	Machinery and equipment	176,085			171,385
	Construction in progress	5,878			1,225
		236,511			223,796
	Less: accumulated depreciation	(170,762		)	(163,820		)
	Total property, plant and equipment	$	65,749		$	59,976
	Depreciation charged against operating income totaled $8.1 million, $8.2 million and $8.8 million in 2014, 2013 and 2012, respectively.

Timber_and_Timberlands

Timber and Timberlands	12 Months Ended
	Dec. 31, 2014
Timber and Timberlands [Abstract]
Timber and Timberlands	TIMBER AND TIMBERLANDS
	(Dollars in thousands)	2014		2013
	Timber and timberlands	$	760,431	$	391,916
	Logging roads	67,989		63,955
	Total timber and timberlands	$	828,420	$	455,871
	Depletion from company-owned lands totaled $14.5 million, $14.6 million and $12.9 million in 2014, 2013 and 2012, respectively. Amortization of logging roads totaled $2.8 million, $2.7 million and $2.6 million in 2014, 2013 and 2012, respectively.
	On December 7, 2014, we acquired approximately 201,000 acres of timberland in Alabama and Mississippi for a total purchase price of $384 million. We borrowed $310 million of new term loans and used cash on hand to pay for the acquisition. See Note 9: Debt in the Notes to Consolidated Financial Statements. The transaction was accounted for as an asset acquisition.
	Payments due under timber cutting contracts total $2.0 million, $2.6 million, $7.3 million and $2.5 million in 2015, 2016, 2017 and 2018, respectively.

Other_Assets

Other Assets	12 Months Ended
	Dec. 31, 2014
Other Assets [Abstract]
Other Assets	OTHER ASSETS
	Current Other Assets
	(Dollars in thousands)	2014		2013
	Basis of real estate held for sale	$	11,529	$	10,010
	Deferred charges	1,172		1,008
	Prepaid expenses	2,364		943
	Total current other assets	$	15,065	$	11,961
	Noncurrent Other Assets
	(Dollars in thousands)	2014		2013
	Deferred charges	$	6,697	$	5,668
	Noncurrent investments	911		3,144
	Derivative asset associated with interest rate swaps	421		1,830
	Developed land	1,733		1,733
	Other	599		363
	Total noncurrent other assets	$	10,361	$	12,738
	Deferred charges primarily consist of deferred financing costs, which are being amortized over the life of the associated debt.

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES
	As a REIT, we generally are not subject to federal and state corporate income taxes on income of the REIT that we distribute to our shareholders. We are, however, subject to corporate taxes on built-in gains (the excess of fair market value over tax basis on January 1, 2006) on sales of real property held by the REIT during the first ten years following our REIT conversion. The sale of standing timber is not subject to built-in gains tax. The Small Business Jobs Act of 2010 modified the built-in gains provisions to exempt sales of real properties in 2011, if five years of the recognition period had elapsed before January 1, 2011. The reduced five-year holding period was extended each year through 2014. Accordingly, the built-in gains tax did not apply to Potlatch sales of real property that occurred in 2011 through 2014.
	We conduct certain activities through taxable REIT subsidiaries (TRS) that are subject to corporate-level federal and state income taxes. These activities are principally comprised of our wood products manufacturing operations and certain real estate investments held for development and sale.
	We reflect accrued interest related to tax obligations, as well as penalties, in our provision for income taxes. For the years ended December 31, 2014, 2013 and 2012, we recognized insignificant amounts related to interest and penalties in our tax provision. At December 31, 2014 and 2013, we had no accrued interest related to tax obligations and no accrued interest receivable with respect to open tax refunds.
	Income tax expense consists of the following for the years ended December 31:
	(Dollars in thousands)	2014			2013			2012
	Current	$	21,205		$	16,352		$	292
	Deferred	(2,143		)	(2,754		)	8,197
	Net operating loss carryforwards	625			287			8,320
	Income taxes	$	19,687		$	13,885		$	16,809
	Income tax expense differs from the amount computed by applying the statutory federal income tax rate of 35% to income before income taxes due to the following for the years ended December 31:
	(Dollars in thousands)	2014			2013			2012
	U.S. federal statutory income tax	$	38,359		$	29,563		$	20,791
	REIT income not subject to federal income tax	(16,812		)	(13,918		)	(5,241		)
	Change in valuation allowance	(1,818		)	(683		)	—
	State income taxes, net of federal income tax	2,234			942			1,615
	Domestic production activities deduction	(1,055		)	(1,579		)	—
	Permanent book-tax differences	(1,073		)	(384		)	(413		)
	All other items	(148		)	(56		)	57
	Income taxes	$	19,687		$	13,885		$	16,809
	Effective tax rate	18		%	16.4		%	28.3		%
	The tax effects of significant temporary differences creating deferred tax assets and liabilities at December 31 were:
	(Dollars in thousands)	2014			2013
	Deferred tax assets:
	Pensions	$	31,527		$	16,807
	Postretirement employee benefits	16,209			18,464
	Inventories	2,720			2,636
	Incentive compensation	2,544			2,807
	Nondeductible accruals	2,033			2,405
	Tax credits	1,904			2,135
	Employee benefits	1,839			1,586
	Net operating loss carryforwards	142			1,056
	Other	224			200
	Total deferred tax assets	59,142			48,096
	Valuation allowance	—			(2,184		)
	Deferred tax assets, net of valuation allowance	59,142			45,912
	Deferred tax liabilities:
	Timber and timberlands	(5,120		)	(5,871		)
	Property, plant and equipment	(10,626		)	(10,741		)
	Total deferred tax liabilities	(15,746		)	(16,612		)
	Net deferred tax assets	$	43,396		$	29,300
	Net deferred tax assets and liabilities consist of:
	(Dollars in thousands)	2014			2013
	Current deferred tax assets	$	6,168		$	7,724
	Noncurrent deferred tax assets	37,228			21,576
	Net deferred tax assets	$	43,396		$	29,300
	As of December 31, 2014 we believe it is more likely than not that we will have sufficient future taxable income to realize all of our deferred tax assets. During 2014, the valuation allowance decreased from $2.2 million to zero, with $1.8 million of the decrease due to the actual use and expected future use of Idaho Investment Tax Credits.
	We have state net operating loss carryforwards of $3.4 million at December 31, 2014 that expire from 2016 through 2017. We have Idaho Investment Tax Credits of $2.9 million at December 31, 2014 that expire from 2016 through 2028.
	The following table summarizes the tax years subject to examination by major taxing jurisdictions:
	Jurisdiction	Years
	Federal	2011	-	2014
	Arkansas	2011	-	2014
	Michigan	2010	-	2014
	Minnesota	2010	-	2014
	Idaho	2011	-	2014
	As of December 31, 2014 and 2013, we had no liabilities for unrecognized tax benefits. We do not currently believe there is a reasonable possibility of recording a liability for unrecognized tax benefits within the next twelve months.

Debt

Debt	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Debt	DEBT
	The following table presents our long-term debt as of December 31:
	(Dollars in thousands)	2014			2013
	Term loans, variable rate 1.88% to 2.13% due 2019 through 2021 and fixed rate 2.95% to 4.64% due 2017 through 2024	$	322,000		$	12,000
	Senior Notes, 7.50%, due 2019	150,000			150,000
	Revenue bonds, 5.90% to 6.95%, due 2024 and 2026	108,335			108,335
	Debentures, 6.95%, due 2015	22,500			22,500
	Medium-term notes, 8.75% to 8.89%, due 2016 through 2022	27,250			27,250
		630,085			320,085
	Interest rate swaps	793			1,830
	Less unamortized discounts	(1,535		)	(1,823		)
		629,343			320,092
	Less current portion	(22,870		)	—
	Long-term debt	$	606,473		$	320,092
	CREDIT AGREEMENT
	On August 12, 2014, we entered into an amended and restated credit agreement with an expiration date of February 12, 2020, which supersedes our previous credit agreement dated as of December 11, 2012. This new credit agreement provides for a revolving line of credit with an initial aggregate principal amount not to exceed $250 million, which may be increased by up to an additional $250 million. It also includes a sublimit of $40 million for the issuance of standby letters of credit and a sublimit of $25 million for swing line loans. Usage under either or both subfacilities reduces availability under the revolving line of credit. As of December 31, 2014, there were no borrowings outstanding under the revolving line of credit, and approximately $1.4 million of the letter of credit subfacility was being used to support several outstanding letters of credit. Available borrowing capacity at December 31, 2014 was $248.6 million.
	Pricing is set according to the type of borrowing. LIBOR Loans are issued at a rate equal to the British Bankers Association LIBOR Rate, while Base Rate Loans are issued at a rate equal to the Base Rate, which is a fluctuating rate per annum equal to the highest of (a) the Federal Funds Rate plus 1/2 of 1.00%, (b) the rate of interest in effect for such day as publicly announced from time to time by KeyBank as its “prime rate,” and (c) the sum of the LIBOR that would apply to a one month Interest Period plus 1.00%. The interest rates we pay for borrowings under either type of loan include an additional Applicable Rate, which can range from 0.875% to 1.70% for LIBOR loans and from 0% to 0.70% for Base Rate loans, depending on our current credit rating. As of December 31, 2014, we were able to borrow under the bank credit facility with the additional applicable rate of 1.30% for LIBOR Loans and 0.30% for Base Rate Loans, with facility fees of 0.2% on the $250 million of the bank credit facility.
	TERM LOANS
	On December 5, 2014, we entered into an amended and restated term loan agreement totaling $322 million, consisting of $310 million of new term loans to fund the acquisition of timberlands in Alabama and Mississippi and$12 million of term loans that we incurred in December 2012 to fund two timberland acquisitions in Arkansas. The new debt consists of six tranches of term loans, with $40.0 million maturing each year from 2019 through 2023 and $110.0 million maturing in 2024. The first three tranches are variable rate term loans based on 3-month LIBOR plus a spread between 1.65% and 1.90%. The last three tranches are fixed rate term loans with interest rates between 4.29% and 4.64%. Our original 2012 term loans consist of two $6 million tranches, with rates of 2.95% on the 2017 maturity and 3.70% on the 2020 maturity. The term loan agreement contains the same covenants and restrictions as those in our bank credit facility.
	DEBT MATURITIES
	Scheduled principal payments due on long-term debt during each of the five years subsequent to December 31, 2014, are as follows:
	(Dollars in thousands)
	2015	$	22,500
	2016	5,000
	2017	11,000
	2018	14,250
	2019	190,000

Accounts_Payable_and_Accrued_L

Accounts Payable and Accrued Liabilities	12 Months Ended
	Dec. 31, 2014
Accounts Payable and Accrued Liabilities [Abstract]
Accounts Payable and Accrued Liabilities	ACCOUNTS PAYABLE AND ACCRUED LIABILITIES
	(Dollars in thousands)	2014		2013
	Wages, salaries and employee benefits	$	14,667	$	15,908
	Trade accounts payable	5,656		7,702
	Taxes other than income taxes	5,663		6,247
	Interest	4,811		4,018
	Logging related expenses	2,983		1,600
	Deferred recreational lease income	1,616		880
	Freight	740		802
	Book overdrafts	4,385		2,920
	Other	2,543		3,540
	Total	$	43,064	$	43,617

Other_LongTerm_Obligations

Other Long-Term Obligations	12 Months Ended
	Dec. 31, 2014
Other Long-term Debt [Abstract]
Other Long-Term Obligations	OTHER LONG-TERM OBLIGATIONS
	(Dollars in thousands)	2014		2013
	Employee benefits and related liabilities	$	8,839	$	15,423
	Cost share logging roads	5,894		5,759
	Other	1,019		1,171
	Total	$	15,752	$	22,353
	On May 8, 2014, our board approved changes to our director compensation program. This amendment states that upon a director's separation from the company, all deferred awards will be settled in company stock and no longer settled in cash. This resulted in a reclassification of the related $4.3 million from employee benefits and related liabilities to stockholders' equity.

Financial_Instruments_and_Conc

Financial Instruments and Concentration of Risk	12 Months Ended
	Dec. 31, 2014
Derivative Instrument Detail [Abstract]
Financial Instruments and Concentration of Risk	FINANCIAL INSTRUMENTS AND CONCENTRATION OF RISK
	FAIR VALUE OF FINANCIAL INSTRUMENTS
	Estimated fair values of our financial instruments as of December 31 are as follows:
		2014						2013
	(Dollars in thousands)	CARRYING			FAIR			CARRYING			FAIR
		AMOUNT			VALUE			AMOUNT			VALUE
	Cash and short-term investments (Level 1)	$	31,012		$	31,012		$	57,837		$	57,837
	Net derivative asset related to interest rate swaps (Level 2)	793			793			1,830			1,830
	Long-term debt (including current portion of long-term debt and fair value adjustments related to fair value swaps) (Level 2)	629,343			657,943			320,092			347,869
	Company owned life insurance (COLI) (Level 3)	877			877			3,110			3,110
	A framework has been established for measuring fair value, which provides a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The three levels of the fair value hierarchy are described below.
	Level 1	Inputs to the valuation methodology are unadjusted quoted prices for identical assets or liabilities in active markets.
	Level 2	Inputs to the valuation methodology include:
	•	Quoted prices for similar assets or liabilities in active markets;
	•	Quoted prices for identical or similar assets or liabilities in inactive markets;
	•	Inputs other than quoted prices that are observable for the asset or liability; and
	•	Inputs that are derived principally from or corroborated by observable market data by correlation or other means.
	If the asset or liability has a specified (contractual) term, the Level 2 input must be observed for substantially the full term of the asset or liability.
	Level 3	Inputs to the valuation methodology are unobservable and significant to the fair value measurement.
	The fair value measurement level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement. Valuation techniques used need to maximize the use of observable inputs and minimize the use of unobservable inputs.
	For cash and short-term investments, the carrying amount approximates fair value due to the short-term nature of these financial instruments. The fair value of the interest rate swaps was determined using discounted cash flow analysis on the expected cash flows of each derivative. The analysis reflects the contractual terms of the derivatives, including the period to maturity, and uses observable market-based inputs, including interest rate forward curves. The fair value of our long-term debt is estimated based upon the quoted market prices for the same or similar debt issues, or estimated based on average market prices for comparable debt when there is no quoted market price. Contract value of our COLI, the amount at which it could be redeemed, is used as a practical expedient to estimate fair value because market prices are not readily available.
	DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES
	We record all derivatives on our balance sheet at fair value. Derivatives designated and qualifying as a hedge of the exposure to changes in the fair value of an asset, liability, or firm commitment attributable to a particular risk, such as interest rate risk, are considered fair value hedges. Hedge accounting generally provides for the matching of the timing of gain or loss recognition on the hedging instrument with the recognition of the changes in the fair value of the hedged asset or liability that is attributable to the hedged risk in a fair value hedge.
	We formally document all relationships between hedging instruments and hedged items, as well as the risk-management objective and strategy for undertaking various hedge transactions.
	FAIR VALUE HEDGES OF INTEREST RATE RISK
	As of December 31, 2014, we had seven separate interest rate swaps with notional amounts totaling $96.75 million associated with our $22.5 million debentures, $24.25 million of our medium-term notes and $50.0 million of our senior notes. The swaps convert interest payments with fixed rates ranging between 6.95% and 8.89% to a variable rate of 3-month LIBOR plus a spread between 4.738% and 6.518%. The interest rate swaps terminate at various dates between December 2015 and November 2019.
	NON-DESIGNATED LUMBER SWAP
	Derivatives not designated as hedges were not speculative and have been used occasionally to manage our exposure to commodity price movements, but did not meet the strict hedge accounting requirements. In February 2012, we entered into two commodity swap contracts that settled during the second quarter of 2012. In September 2011, we entered into two commodity swap contracts that settled in February 2012. Changes in the fair value of derivatives not designated in hedging relationships were recorded directly in net income. There were no outstanding lumber swap contracts at December 31, 2014 or 2013.
	BALANCE SHEET AND INCOME EFFECTS OF DERIVATIVES
	The fair values of derivative instruments on our Consolidated Balance Sheets as of December 31 are as follows:
		DERIVATIVE ASSETS
			2014			2013
	(Dollars in thousands)	BALANCE SHEET	FAIR VALUE			FAIR VALUE
		LOCATION
	Derivatives designated as hedging instruments:
	Interest rate contracts	Other noncurrent assets	$	793		$	1,830
	Total derivatives designated as hedging instruments		$	793		$	1,830
	The effect of derivatives on the Consolidated Statements of Income for the years ended December 31, 2014, 2013 and 2012 are as follows:
		LOCATION OF GAIN (LOSS) RECOGNIZED  IN INCOME	AMOUNT OF GAIN (LOSS)
			RECOGNIZED IN INCOME
	(Dollars in thousands)		2014			2013			2012
	Derivatives designated in fair value hedging relationships:
	Interest rate contracts
	Realized gain on hedging instrument1	Interest expense	$	979		$	960		$	868
	Net gain recognized in income from fair value hedges		$	979		$	960		$	868
	Derivatives not designated as hedging instruments:
	Lumber contracts
	Unrealized loss on derivative	Cost of goods sold	$	—		$	—		$	(480	)
	Realized loss on derivative	Cost of goods sold	—			—			(396		)
	Net loss recognized in income from derivatives not designated as hedging instruments		$	—		$	—		$	(876	)
	1	Realized gain on hedging instrument consists of net cash settlements and interest accruals on the interest rate swaps during the period.
	CONCENTRATION OF RISK
	One customer accounted for slightly more than 10% of our revenues in the years ended December 31, 2014, 2013 and 2012.

Savings_Plans_Pension_Plans_an

Savings Plans, Pension Plans and Other Postretirement Employee Benefits	12 Months Ended
	Dec. 31, 2014
General Discussion of Pension and Other Postretirement Benefits [Abstract]
Savings Plans, Pension Plans and Other Postretirement Employee Benefits	SAVINGS PLANS, PENSION PLANS AND OTHER POSTRETIREMENT EMPLOYEE BENEFITS
	SAVINGS PLANS
	Substantially all of our employees are eligible to participate in 401(k) savings plans. In 2014, 2013 and 2012, we made matching 401(k) contributions on behalf of employees of $2.0 million, $1.8 million and $1.6 million, respectively. Effective January 1, 2011, we closed our defined benefit pension plans to any new salaried and hourly non-represented entrants. In connection with these closures, additional company 401(k) contributions are made for employees hired after that date.
	PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS
	We also provide benefits under company-sponsored defined benefit retiree health care plans, which cover certain salaried and hourly employees. Most of the retiree health care plans require retiree contributions and contain other cost-sharing features.
	We recognize the underfunded status of our defined benefit pension plans and other postretirement employee benefit obligations on our Consolidated Balance Sheets. We recognize the changes in the funded status in the year in which changes occur through our Consolidated Statements of Comprehensive Income.
	We use a December 31 measurement date for our benefit plans and obligations.
	The change in benefit obligation, change in plan assets and funded status for company-sponsored benefit plans and obligations are as follows:
		PENSION PLANS						OTHER POSTRETIREMENT
								EMPLOYEE BENEFITS (OPEB)
	(Dollars in thousands)	2014			2013			2014			2013
	Benefit obligation at beginning of year	$	(393,565	)	$	(445,535	)	$	(47,343	)	$	(52,033	)
	Service cost	(5,081		)	(5,318		)	(25		)	(94		)
	Interest cost	(19,184		)	(17,826		)	(1,741		)	(1,810		)
	Plan amendments	—			—			—			—
	Actuarial loss (gain)	(49,990		)	41,178			3,229			2,692
	Benefits paid	50,126			33,936			4,319			3,902
	Benefit obligation at end of year	$	(417,694	)	$	(393,565	)	$	(41,561	)	$	(47,343	)
	Fair value of plan assets at beginning of year	$	350,588		$	345,633		$	—		$	—
	Actual return on plan assets	31,280			37,157			—			—
	Employer contributions and benefit payments	5,317			1,734			4,319			3,902
	Benefits paid	(50,126		)	(33,936		)	(4,319		)	(3,902		)
	Fair value of plan assets at end of year	$	337,059		$	350,588		$	—		$	—
	Amounts recognized in the consolidated balance sheets:
	Current liabilities	$	(1,774	)	$	(1,772	)	$	(4,486	)	$	(4,929	)
	Noncurrent liabilities	(78,861		)	(41,205		)	(37,075		)	(42,414		)
	Funded status	$	(80,635	)	$	(42,977	)	$	(41,561	)	$	(47,343	)
	Changes in actuarial assumptions, primarily the decrease in the discount rate, and adoption of updated mortality tables used to calculate our pension liabilities resulted in a decrease to the funded status of our pension plans at the end of 2014.
	The accumulated benefit obligation for all defined benefit pension plans was $410.4 million and $387.4 million at December 31, 2014 and 2013, respectively.
	On January 1, 2011 we froze our pension plans to any new salaried and hourly non-represented employees hired after that date.
	In late 2009, we restructured our health care and life insurance plans for the majority of our retirees, with the changes effective January 1, 2010. The level of subsidy was frozen for retirees so that all future increments in heath care costs will be borne by the retirees. In addition, the retiree medical plans were redesigned for all retirees. For retirees under age 65, a high deductible medical plan was created and all other existing medical plans were terminated. These retirees were transferred to the new medical plan effective January 1, 2010. For retirees age 65 or over, the medical plan is divided into two components, with the company continuing to self-insure prescription drugs and providing a fully-insured medical supplemental plan through AARP/United Healthcare. Both medical plans require the retiree to contribute the amounts in excess of the company subsidy in order to continue coverage. Finally, vision, dental and life insurance coverage for these retirees were terminated. The effect of these retiree plan changes was a reduction in the accumulated postretirement benefit obligation of $76.7 million, which was recognized as of December 31, 2009. The retirees from our Arkansas wood products manufacturing facility are represented by a bargaining group and their retiree medical plan is covered by the collective bargaining agreement.
	PENSION ASSETS
	We utilize formal investment policy guidelines for our company-sponsored pension plan assets. These guidelines are periodically reviewed by the board of directors. The board of directors has delegated its authority to management to insure that the investment policy and guidelines are adhered to and the investment objectives are met.
	The general policy states that plan assets will be invested to seek the greatest return consistent with the fiduciary character of the pension funds and to allow the plans to meet the need for timely pension benefit payments. The specific investment guidelines stipulate that management will maintain adequate liquidity for meeting expected benefit payments by reviewing, on a timely basis, contribution and benefit payment levels and appropriately revise long-term and short-term asset allocations. Management takes reasonable and prudent steps to preserve the value of pension fund assets and to avoid the risk of large losses. Major steps taken to provide this protection include the following:
	•Assets are diversified among various asset classes, such as domestic equities, global equities, fixed income, convertible securities and liquid reserves. The long-term asset allocation ranges are as follows:
		Domestic and international equities	24	%	-	48%
		Fixed income securities	38	%	-	58%
		Alternatives	12	%	-	18%
		Cash	0	%	-	5%
	Periodic reviews of allocations within these ranges are made to determine what adjustments should be made based on changing economic and market conditions and specific liquidity requirements.
	•	Assets are managed by professional investment managers and may be invested in separately managed accounts or commingled funds. Assets are diversified by selecting different investment managers for each asset class and by limiting assets under each manager to no more than 25% of the total pension fund.
	•	Assets are not invested in Potlatch stock.
	The investment guidelines also provide that the individual investment managers are expected to achieve a reasonable rate of return over a market cycle. Emphasis will be placed on long-term performance versus short-term market aberrations. Factors to be considered in determining reasonable rates of return include performance achieved by a diverse cross section of other investment managers, performance of commonly used benchmarks (e.g., Russell 3000 Index, Barclays US Long Credit Index, Morgan Stanley Capital International All Country World Index ex US), actuarial assumptions for return on plan investments and specific performance guidelines given to individual investment managers.
	The asset allocations of the pension benefit plans’ assets at December 31 by asset category are as follows:
		PENSION PLANS
	ASSET CATEGORY	2014		2013
	Domestic equity securities	14	%	20	%
	Global/international equity securities	22		27
	Fixed income securities	48		38
	Other	16		15
	Total	100	%	100	%
	The pension assets are stated at fair value. Refer to Note 12. Financial Instruments and Concentration of Risk for discussion of the framework used to measure fair value.
	Following is a description of the valuation methodologies used for assets measured at fair value:
	•	Corporate common and preferred stocks are valued at quoted market prices reported on the major securities markets, and are classified in Level 1. Investments in registered investment company funds for which market quotations are generally readily available are valued at the last reported sale price, official closing price or publicly available net asset value, or NAV, (or its equivalent) on the primary market or exchange on which they are traded, and are classified in Level 1.
	•	Investments in common and collective trust funds, hedge funds and liquidating trusts that maintain investments in mortgage-backed securities, are generally valued based on their respective NAV (or its equivalent), as a practical expedient to estimate fair value due to the absence of readily available market prices. Investments that may be fully redeemed at NAV in the near-term are generally classified in Level 2.
	•	Investments in funds that may not be fully redeemed at NAV in the near-term are generally classified in Level 3.
	Fair value measurements at December 31, 2014:
	(Dollars in thousands)
	ASSET CATEGORY	QUOTED PRICES IN			SIGNIFICANT			SIGNIFICANT			TOTAL
		ACTIVE MARKETS FOR			OBSERVABLE			UNOBSERVABLE
		IDENTICAL ASSETS			INPUTS			INPUTS
		(LEVEL 1)			(LEVEL 2)			(LEVEL 3)
	Cash and equivalents	$	6,586		$	—		$	—		$	6,586
	Equity securities:
U.S. small/mid cap1	1,136			—			—			1,136
International companies	13,782			—			—			13,782
Mutual funds2	226,710						—			226,710
Collective investments:
U.S. large cap3	—			30,005			—			30,005
Developed markets4	—			29,879			—			29,879
Emerging markets5	—			28,961			—			28,961
Total	$	248,214		$	88,845		$	—		$	337,059
1	These are managed investments in US small/mid cap equities that track the Russell 2500 Growth index.
2	The mutual funds were 72% invested in high-quality intermediate and long-term investment grade securities, 22% invested in a diversified portfolio of fixed-income instruments of varying maturities, which may be represented by forwards or derivatives such as options, futures contracts or swap agreements and debt securities, and 6% invested in US small/mid cap equities that track the Russell 2500 Growth index.
3	These collective investments are invested in US large cap equities that track the S&P 500.
4	These collective investments are invested in equity funds of developed markets outside of the US & Canada, that track the MSCI EAFE Value or MSCI EAFE Growth index.
5	These collective investments are invested in equity funds of emerging markets outside of the US & Canada, that track the MSCI Emerging Markets index.
Fair value measurements at December 31, 2013:
(Dollars in thousands)
ASSET CATEGORY	QUOTED PRICES IN			SIGNIFICANT			SIGNIFICANT			TOTAL
	ACTIVE MARKETS FOR			OBSERVABLE			UNOBSERVABLE
	IDENTICAL ASSETS			INPUTS			INPUTS
	(LEVEL 1)			(LEVEL 2)			(LEVEL 3)
Cash and equivalents	$	9,673		$	—		$	—		$	9,673
Equity securities:
U.S. large cap1	32,304			—			—			32,304
U.S. small/mid cap2	19,053			—			—			19,053
International companies	34,773			—			—			34,773
Mutual funds3	185,505			—			—			185,505
Collective investments:
Developed markets4	—			17,401			—			17,401
Emerging markets5	—			41,300			—			41,300
Hedge funds6	—			—			10,579			10,579
Total	$	281,308		$	58,701		$	10,579		$	350,588
1	These are managed investments in US large cap equities that track the Russell 1000 Value index.
2	These are managed investments in US small/mid cap equities that track the Russell 2500 Growth index.
3	The mutual funds were 50% invested in high-quality intermediate and long-term investment grade securities and 50% invested in a diversified portfolio of fixed-income instruments of varying maturities, which may be represented by forwards or derivatives such as options, futures contracts or swap agreements and debt securities.
4	These collective investments are invested in equity funds of developed markets outside of the US & Canada, that track the MSCI EAFE index.
5	These collective investments are invested in equity funds of emerging markets outside of the US & Canada, that track the MSCI Emerging Markets index.
6	The hedge funds are 37% invested in long/short and event-driven equity, 24% invested in long and short credit, 11% in relative value, 10% invested in distressed debt, 6% invested in convertible bond hedging, with the remaining 13% in other investments.
The following table sets forth a summary of changes in the fair value of the plans’ Level 3 assets for the years ended December 31:
	Hedge Funds
(Dollars in thousands)	2014			2013
Balance, beginning of year	$	10,579		$	45,693
Sales and settlements	(10,579		)	(34,500		)
Unrealized losses relating to assets still held at the reporting date	—			(614		)
Balance, end of year	$	—		$	10,579
PLAN ACTIVITY
Pre-tax components of net periodic cost (benefit) recognized in our Consolidated Statements of Income were as follows:
	PENSION PLANS									OTHER POSTRETIREMENT
										EMPLOYEE BENEFITS
(Dollars in thousands)	2014			2013			2012			2014			2013			2012
Service cost	$	5,081		$	5,318		$	5,238		$	25		$	94		$	284
Interest cost	19,184			17,826			19,986			1,741			1,810			2,478
Expected return on plan assets	(24,512		)	(26,092		)	(28,755		)	—			—			—
Curtailment credit	—			—			—			—			—			(103		)
Amortization of prior service cost (credit)	748			779			770			(9,641		)	(9,708		)	(9,343		)
Amortization of actuarial loss	14,451			19,929			15,356			2,186			3,209			3,127
Net periodic cost (benefit)	$	14,952		$	17,760		$	12,595		$	(5,689	)	$	(4,595	)	$	(3,557	)
Other amounts recognized in our Consolidated Statements of Comprehensive Income were as follows:
	PENSION PLANS									OTHER POSTRETIREMENT
										EMPLOYEE BENEFITS
(Dollars in thousands)	2014			2013			2012			2014			2013			2012
Net amount at beginning of year	$	117,167		$	161,667		$	158,883		$	(18,447	)	$	(20,769	)	$	(18,001	)
Amounts arising during the period:
Net loss (gain)	43,223			(52,242		)	20,180			(3,229		)	(2,692		)	(4,878		)
Prior service cost (credit)	—			—			510			—			—			(5,942		)
Taxes	(16,857		)	20,374			(8,069		)	1,259			1,050			4,260
Net amount arising during the period	26,366			(31,868		)	12,621			(1,970		)	(1,642		)	(6,560		)
Amounts reclassified during the period:
Amortization of prior service (cost) credit	(748		)	(779		)	(770		)	9,641			9,708			9,343
Amortization of actuarial loss	(14,451		)	(19,929		)	(15,356		)	(2,186		)	(3,209		)	(3,127		)
Taxes	5,927			8,076			6,289			(2,907		)	(2,535		)	(2,424		)
Net reclassifications during the period	(9,272		)	(12,632		)	(9,837		)	4,548			3,964			3,792
Net amount at end of year	$	134,261		$	117,167		$	161,667		$	(15,869	)	$	(18,447	)	$	(20,769	)
Amounts recognized in accumulated other comprehensive loss on our Consolidated Balance Sheets, net of tax, consist of:
	PENSION PLANS						OTHER POSTRETIREMENT
							EMPLOYEE BENEFITS
(Dollars in thousands)	2014			2013			2014			2013
Net loss	$	134,717		$	115,404		$	(21,750	)	$	16,490
Prior service cost (credit)	(456		)	1,763			5,881			(34,937		)
Net amount recognized	$	134,261		$	117,167		$	(15,869	)	$	(18,447	)
The estimated net loss and prior service cost for the defined benefit pension plans that will be amortized from accumulated other comprehensive loss into net periodic benefit cost over the next fiscal year are $17.6 million and $0.6 million, respectively. The estimated net loss and prior service credit for OPEB obligations that will be amortized from accumulated other comprehensive loss into net periodic benefit over the next fiscal year are $2.2 million and $9.3 million, respectively.
EXPECTED FUNDING AND BENEFIT PAYMENTS
We are not required to make a contribution to our qualified pension plan in 2015. Our non-qualified pension plan is unfunded and benefit payments are paid from our general assets. We estimate approximately $1.8 million in supplemental pension plan payments in 2015.
Our other postretirement employee benefit plans are unfunded and benefit payments are paid from our general assets they come due. Estimated future benefit payments represent benefit costs incurred during the year by eligible participants.
Estimated future benefit payments, which reflect expected future service are as follows for the years indicated:
(Dollars in thousands)	PENSION PLANS			OTHER POSTRETIREMENT
				EMPLOYEE BENEFITS
2015	$	29,566		$	4,486
2016		29,342			4,293
2017		29,167			4,044
2018		29,049			3,789
2019		29,031			3,541
2020 – 2024		143,681			14,600
ACTUARIAL ASSUMPTIONS
The weighted average assumptions used to determine the benefit obligation as of December 31 were:
	PENSION PLANS						OTHER POSTRETIREMENT
							EMPLOYEE BENEFITS
	2014		2013		2012		2014		2013		2012
Discount rate	4.25	%	5.1	%	4.15	%	3.9	%	4.45	%	3.7	%
Rate of salaried compensation increase	3	%	3	%	3.5	%	—		—		—
The weighted average assumptions used to determine the net periodic benefit (cost) for the years ended December 31 were:
	PENSION PLANS						OTHER POSTRETIREMENT
							EMPLOYEE BENEFITS
	2014		2013		2012		2014		2013		2012
Discount rate	5.1	%	4.15	%	4.95	%	4.45	%	3.7	%	4.85	%
Expected return on plan assets	7.5	%	8	%	8	%	—		—		—
Rate of salaried compensation increase	3	%	3.5	%	3.5	%	—		—		—
The discount rate used in the determination of pension and other postretirement employee benefit obligations in 2014 and 2013 was calculated using hypothetical bond portfolios to match the expected benefit payments under each of our pension plans and other postretirement employee benefit obligations based on bonds available on December 31, 2014 with a rating of "AA" or better. The portfolios were well-diversified over corporate industrial, corporate financial, municipal, federal and foreign government issuers.
The expected return on plan assets assumption is based upon an analysis of historical long-term returns for various investment categories, as measured by appropriate indices. These indices are weighted based upon the extent to which plan assets are invested in the particular categories in arriving at our determination of a composite expected return. The expected rate of return assumption that will be used to determine net periodic cost for 2015 is 6.75%.
The assumed health care cost trend rate used to calculate other postretirement employee benefit obligations as of December 31, 2014 was 5.7% for a certain group of participants under age 65 in our hourly plan and our Arkansas participants covered by a collective bargaining agreement, grading ratably to an assumption of 4.3% in 2094.
A one percentage point change in the health care cost trend rates would have the following effects on our December 31, 2014 Consolidated Financial Statements:
(Dollars in thousands)	1% INCREASE			1% DECREASE
Effect on total service cost plus interest cost	$	5		$	(5	)
Effect on accumulated postretirement benefit obligation	112			(112		)

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	COMMITMENTS AND CONTINGENCIES
	We have operating leases covering office space, equipment, land and vehicles expiring at various dates through 2033. As leases expire, it can be expected that certain leases will be renewed or replaced in the normal course of business.
	As of December 31, 2014, the future minimum rental payments required under our operating leases are as follows:
	(Dollars in thousands)
	2015	$	4,211
	2016	3,148
	2017	1,904
	2018	1,123
	2019	452
	2020 and thereafter	1,355
	Total	$	12,193
	Operating lease expense was $4.0 million, $3.6 million and $3.1 million for the years ended December 31, 2014, 2013 and 2012, respectively.
	In January 2007, the Environmental Protection Agency (EPA) notified us that we are a potentially responsible party under the Comprehensive Environmental Response, Compensation and Liability Act of 1980 (CERCLA) and the Clean Water Act for cleanup of a site known as Avery Landing in northern Idaho. We own a portion of the land at the Avery Landing site, which we acquired in 1980 from the Milwaukee Railroad. The land we own at the site and adjacent properties were contaminated with petroleum as a result of the Milwaukee Railroad's operations at the site prior to 1980. We entered into a consent order with the EPA in August 2008 to conduct an Engineering Evaluation/Cost Analysis (EE/CA) study to determine the best means of addressing the contamination at the site. In January 2010, we submitted our draft EE/CA report to the EPA outlining various alternatives for addressing the contamination at the entire site. Ultimately, the EPA published a draft EE/CA report on January 26, 2011 for public comment. The public comment period closed March 11, 2011, and on July 5, 2011, the EPA issued an Action Memorandum for the Avery Landing Site selecting contaminant extraction and off-site disposal as the remedial alternative. On May 23, 2012, we signed a consent order with the EPA pursuant to which we agreed to provide $1.75 million in funding for EPA cleanup on a portion of our property (including the adjacent riverbank owned by the Idaho Department of Lands). On April 4, 2013, the EPA issued a unilateral administrative order requiring us to remediate the portion of the Avery Landing site that we own. During the first quarter of 2013, we increased our accrual by $0.75 million. We began work on the site in May 2013 and discovered more contaminant on our property than had been expected based upon previous testing, and accordingly, during the second quarter of 2013 we increased our expense by an additional $1.75 million. During the third quarter of 2013, we increased our accrual by approximately $1.0 million to reflect the final work completed on the site in September 2013. On January 23, 2014, the EPA project manager informed us that he approved our Final Completion Report dated January 17, 2014 and our Final Natural Attenuation Performance Monitoring Plan dated January 17, 2014, and we have no further obligations with regard to our property other than fulfillment of the Monitoring Plan.
	The following table details our Avery Landing environmental remediation reserve balance for the years ended December 31:
	(Dollars in thousands)	2014		2013
	Beginning reserve balance	$	—	$	4,250
	Environmental remediation charge	—		3,522
	Cash payments	—		(7,772		)
	Ending reserve balance	$	—	$	—
	Negotiations with the EPA continue regarding a final settlement and release of EPA claims against us regarding the site, and we cannot predict at this time what additional costs, if any, that we may incur on this matter. We have reserved all of our rights to seek reimbursement for the costs of remediation from all parties potentially responsible.
	We believe there is no pending or threatened litigation that would have a material adverse effect on our financial position, operations or liquidity.

EquityBased_Compensation_Plans

Equity-Based Compensation Plans	12 Months Ended
	Dec. 31, 2014
Share-based Compensation [Abstract]
Equity-Based Compensation Plans	EQUITY-BASED COMPENSATION PLANS
	As of December 31, 2014, we had two stock incentive plans under which performance shares, restricted stock units (RSUs), or deferred compensation stock equivalent units were outstanding. All of these plans have received shareholder approval. We were originally authorized to issue up to 1.6 million shares and 1.0 million shares under our 2005 Stock Incentive Plan and 2014 Stock Incentive Plan, respectively. At December 31, 2014, approximately 1.1 million shares were authorized for future use under the 2005 Stock Incentive Plan and 2014 Stock Incentive Plan. We issue new shares of common stock to settle performance shares, restricted stock units, and deferred compensation stock equivalent units.
	The following table details our compensation expense and the related income tax benefit as of December 31:
	(Dollars in thousands)	2014			2013			2012
	Employee equity-based compensation expense:
	Performance shares	3,515			3,635			3,440
	Restricted stock units	622			742			627
	Total employee equity-based compensation expense	$	4,137		$	4,377		$	4,067
	Deferred compensation stock equivalent units expense	$	345		$	1,265		$	2,008
	Total tax benefit recognized for shared-based payment awards	$	280		$	71		$	525
	PERFORMANCE SHARES
	Performance share awards granted under the stock incentive plans have a three-year performance period and shares are issued at the end of the period if the performance measure is met. The performance measure is based on the percentile ranking of our total shareholder return relative to the total shareholder return performance of both a selected peer group of companies and a larger group of indexed companies over the three-year performance period. The number of shares actually issued, as a percentage of the amount subject to the performance share award, could range from 0% to 200%. Performance share awards granted under our stock incentive plans do not have voting rights unless and until shares are issued upon settlement. If shares are issued at the end of the three-year performance measurement period, the recipients will receive distribution equivalents in the form of additional shares at the time of payment equal to the distributions that would have been paid on the shares earned had the recipients owned the shares during the three-year period. Therefore, the shares are not considered participating securities.
	A Monte Carlo simulation method is used to estimate the stock prices of Potlatch and the selected peer companies at the end of the three-year performance period. The expected volatility of each company’s stock price and covariance of returns among the peer companies are key assumptions within the Monte Carlo simulation. Historical volatility over a term similar to the performance period is considered a reasonable proxy for forecasted volatility. Likewise, because the returns of Potlatch and the peer group companies are correlated, the covariance, a measure of how two variables tend to move together, is calculated over a historical term similar to the performance period and applied in the simulations. The simulations use the stock prices of Potlatch and the peer group of companies as of the award date as a starting point. Multiple simulations are generated, resulting in share prices and total shareholder return values for Potlatch and the peer group of companies. For each simulation, the total shareholder return of Potlatch is ranked against that of the peer group of companies. The future value of the performance share unit is calculated based on a multiplier for the percentile ranking and then discounted to present value. The discount rate is the risk-free rate as of the award date for a term consistent with the performance period. Awards are also credited with dividend equivalents at the end of the performance period, and as a result, award values are not adjusted for dividends.
	The following table presents the key inputs used in calculating the fair value of the performance share awards in 2014, 2013 and 2012, and the resulting fair values:
		2014			2013			2012
	Shares granted	87,441			83,111			85,028
	Stock price as of valuation date	$	39.76		$	45.31		$	31.11
	Risk-free rate	0.72		%	0.4		%	0.4		%
	Fair value of a performance share	$	45.57		$	62.78		$	34.24
	The following table summarizes outstanding performance share awards as of December 31, 2014, 2013 and 2012, and changes during those years:
	(Dollars in thousands, except	2014						2013					2012
	per-share amounts)	SHARES			WEIGHTED AVG.			SHARES			WEIGHTED AVG.		SHARES			WEIGHTED AVG.
					GRANT DATE						GRANT DATE					GRANT DATE
					FAIR VALUE						FAIR VALUE					FAIR VALUE
	Unvested shares outstanding at January 1	155,814			$	48.73		160,214			$	44.5	154,594			$	50.54
	Granted	87,441			45.57			83,111			62.78		85,028			34.24
	Vested	(76,202		)	34.24			(71,861		)	55.84		(76,812		)	45.3
	Forfeited	(6,820		)	49.75			(15,650		)	47.32		(2,596		)	44.99
	Unvested shares outstanding at December 31	160,233			53.86			155,814			48.73		160,214			44.5
	Total grant date fair value of share awards vested during the year	$	2,609					$	4,013				$	3,480
	Aggregate intrinsic value of unvested share awards at December 31	$	6,709					$	6,504				$	6,019
	As of December 31, 2014, there was $4.1 million of unrecognized compensation cost related to unvested performance share awards, which is expected to be recognized over a weighted average period of 1.6 years.
	RESTRICTED STOCK UNITS
	Our 2005 Stock Incentive Plan and 2014 Stock Incentive Plan also allow for awards to be issued in the form of RSU grants. During 2014, 2013 and 2012, certain officers and other select employees of the company were granted RSU awards that will accrue distribution equivalents based on distributions paid during the RSU vesting period. The distribution equivalents will be converted into additional RSUs that will vest in the same manner as the underlying RSUs to which they relate. Therefore, the shares are not considered participating securities. The terms of the awards state that the RSUs will vest in a given time period of one to three years, and the terms of certain awards follow a vesting schedule within the given time period.
	A summary of the status of outstanding RSU awards as of December 31, 2014, 2013 and 2012, and changes during these years is presented below:
		2014						2013					2012
		SHARES			WEIGHTED AVERAGE GRANT DATE			SHARES			WEIGHTED AVERAGE GRANT DATE		SHARES			WEIGHTED AVERAGE GRANT DATE
					FAIR VALUE						FAIR VALUE					FAIR VALUE
	Unvested shares outstanding at January 1	37,461			$	38.69		40,219			$	34.82	36,359			$	35.6
	Granted	19,599			40.51			23,449			44.41		20,225			31.53
	Vested	(21,333		)	34.46			(19,796		)	38.19		(14,861		)	32.41
	Forfeited	(3,272		)	42.06			(6,411		)	36.91		(1,504		)	33.36
	Unvested shares outstanding at December 31	32,455			42.24			37,461			38.69		40,219			34.82
	Total grant date fair value of RSU awards vested during the year (in thousands)	$	735					$	756				$	482
	Aggregate intrinsic value of unvested RSU awards at December 31 (in thousands)	$	1,359					$	2,511				$	1,575
	As of December 31, 2014, there was $0.8 million of total unrecognized compensation cost related to outstanding RSU awards, which is expected to be recognized over a weighted average period of 1.5 years.
	STOCK OPTIONS
	All outstanding stock options were granted with an exercise price equal to the market price on the date of grant, were fully exercisable after two years and expire not later than 10 years from the date of grant. No new stock options were granted in 2014, 2013 or 2012.
	A summary of the status of outstanding stock options as of December 31, 2014, 2013 and 2012 and changes during those years is presented below:
		2014						2013					2012
		SHARES			WEIGHTED AVG.			SHARES			WEIGHTED AVG.		SHARES			WEIGHTED AVG.
					EXERCISE PRICE						EXERCISE PRICE					EXERCISE PRICE
	Outstanding at January 1	12,859			$	30.92		83,827			$	27.46	144,684			$	23.34
	Shares exercised	(12,859		)	30.92			(70,968		)	26.25		(60,857		)	17.66
	Outstanding and exercisable at December 31	—						12,859			30.92		83,827			27.46
	Total intrinsic value of options exercised during the year (in thousands)	$	150					$	1,423				$	938
	Cash received from stock option exercises for the years ended December 31, 2014, 2013 and 2012 was $0.4 million, $1.9 million and $1.1 million, respectively.
	DEFERRED COMPENSATION STOCK EQUIVALENT UNITS
	A long term incentive award is granted annually to our directors, and payable upon a director's separation from service. Directors may also elect to defer their annual retainers, payable in the form of stock. All stock unit equivalent accounts are credited with dividend equivalents. As of December 31, 2014, there were 122,782 shares outstanding that will be distributed in the future to directors as common stock.

Segment_Information

Segment Information	12 Months Ended
	Dec. 31, 2014
Segment Reporting Information, Additional Information [Abstract]
Segment Information	SEGMENT INFORMATION
	Our businesses are organized into three reportable operating segments: Resource, Wood Products and Real Estate. The Resource segment manages our timberlands to optimize revenue producing opportunities while adhering to our strict stewardship standards. Management activities include planting and harvesting trees and building and maintaining roads. The Resource segment also generates revenues from non-timber resources such as hunting leases, recreation permits and leases, mineral rights leases, biomass production, carbon sequestration and other leasing opportunities. The Wood Products segment manufactures and markets lumber and plywood. The business of our Real Estate segment consists primarily of the sale of land holdings deemed non-strategic or identified as having higher and better use alternatives. The Real Estate segment engages in real estate subdivision and development activities through Potlatch TRS.
	The reporting segments follow the same accounting policies used for our Consolidated Financial Statements, as described in the summary of principal accounting policies, with the exception of the valuation of inventories. All segment inventories are reported using the average cost method, while the LIFO reserve is recorded at the corporate level. Management evaluates a segment’s performance based upon profit or loss from operations before income taxes. Intersegment revenues are recorded based on prevailing market prices.
	The following table presents business segment information for each of the past three years. Corporate information is included to reconcile segment data to the Consolidated Financial Statements.
	(Dollars in thousands)	2014			2013			2012
	Revenues:
	Resource	$	252,581		$	238,228		$	207,846
	Wood Products	376,239			366,015			329,404
	Real Estate	40,460			26,160			38,238
		669,280			630,403			575,488
	Elimination of intersegment revenues - Resource1	(62,330		)	(60,114		)	(50,354		)
	Total consolidated revenues	$	606,950		$	570,289		$	525,134
	Operating Income:
	Resource	$	84,976		$	73,425		$	49,543
	Wood Products	52,442			58,892			45,456
	Real Estate	26,945			18,266			28,056
	Eliminations and adjustments	(190		)	(907		)	(1,061		)
		164,173			149,676			121,994
	Corporate	(31,667		)	(42,078		)	(37,052		)
	Operating income	132,506			107,598			84,942
	Interest expense, net	(22,909		)	(23,132		)	(25,539		)
	Income before income taxes	$	109,597		$	84,466		$	59,403
	Depreciation, depletion and amortization:
	Resource	$	17,847		$	18,103		$	16,446
	Wood Products	6,176			6,194			6,538
	Real Estate	59			56			36
		24,082			24,353			23,020
	Corporate	2,667			2,609			3,227
	Total depreciation, depletion and amortization	$	26,749		$	26,962		$	26,247
	Basis of real estate sold:
	Real Estate	$	9,355		$	3,536		$	5,413
	Elimination and adjustments	(709		)	(632		)	(365		)
	Total basis of real estate sold	$	8,646		$	2,904		$	5,048
	Assets:
	Resource and Real Estate2	$	847,873		$	476,628		$	477,271
	Wood Products	118,674			115,664			100,190
		966,547			592,292			577,461
	Corporate	68,874			88,238			141,436
	Total consolidated assets	$	1,035,421		$	680,530		$	718,897
	Capital Expenditures:3
	Resource and Real Estate	$	11,116		$	12,449		$	12,138
	Wood Products	12,551			9,013			4,427
		23,667			21,462			16,565
	Corporate	565			1,131			845
	Total capital expenditures	$	24,232		$	22,593		$	17,410
	1	Intersegment revenues for 2012-2014, which were based on prevailing market prices, consisted of logs sold by our Resource segment to the Wood Products segment.
	2	Assets are shown on a combined basis for the Resource and Real Estate segments, as we do not produce information separately for those segments for internal purposes.
	3	Excludes acquisition of timber and timberlands.
	All of our wood products facilities and all other assets are located within the continental United States. We sell and ship products to Canada and Mexico. Geographic information regarding our revenues is summarized as follows:
	(Dollars in thousands)	2014			2013			2012
	United States	$	601,738		$	558,138		$	516,466
	Canada	2,618			9,645			5,180
	Mexico	2,594			2,506			3,488
	Total consolidated revenues	$	606,950		$	570,289		$	525,134

Financial_Results_by_Quarter

Financial Results by Quarter	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Data [Abstract]
Financial Results by Quarter	FINANCIAL RESULTS BY QUARTER (UNAUDITED)
		THREE MONTHS ENDED
	(Dollars in thousands, except per-share amounts)	MARCH 31				JUNE 30				SEPTEMBER 30				DECEMBER 31
		2014		2013		2014		2013		2014		2013		2014		2013
	Revenues	$	139,579	$	139,253	$	143,919	$	133,212	$	177,215	$	157,869	$	146,237	$	139,955
	Operating income	31,309		26,608		29,725		29,441		44,869		30,904		26,603		20,645
	Net income	20,350		15,487		16,270		19,182		33,154		22,191		20,136		13,721
	Net income per share1
	Basic	$	0.5	$	0.38	$	0.4	$	0.47	$	0.81	$	0.55	$	0.49	$	0.34
	Diluted	0.5		0.38		0.4		0.47		0.81		0.54		0.49		0.34
	1	Per-share amounts are computed independently for each of the quarters presented. Therefore, the sum of the quarterly per-share amounts may not equal the total computed for the year.

Summary_of_Principal_Accountin1

Summary of Principal Accounting Policies Summary of Principal Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Consolidation	CONSOLIDATION
	The Consolidated Financial Statements include the accounts of Potlatch Corporation and its subsidiaries after elimination of significant intercompany transactions and accounts. There are no significant unconsolidated subsidiaries.
	We are primarily engaged in activities associated with timberland management, including the sale of timber, the management of approximately 1.6 million acres of timberlands and the purchase and sale of timberlands. We are also engaged in the manufacture and sale of wood products. Our timberlands and all of our wood products facilities are located within the continental United States. The primary market for our products is the United States. We converted to a Real Estate Investment Trust (REIT) effective January 1, 2006.
Significant Estimates	SIGNIFICANT ESTIMATES
	The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America, which we refer to in this report as U.S. GAAP, requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates and assumptions.
	Significant estimates are described in further detail in the Notes to Consolidated Financial Statements. Significant estimates include timber volumes, assumptions utilized for asset and disposal group impairment tests, income projections and tax planning strategies used to support realization of deferred tax assets, environmental liabilities, pension and postretirement obligation assumptions and fair value of derivative instruments.
Equity-Based Compensation	EQUITY-BASED COMPENSATION
	Equity-based awards are measured at fair value on the dates they are granted or modified. These measurements establish the cost of the equity-based awards for accounting purposes. The cost of the equity-based award is then recognized in the Consolidated Statements of Income over each employee’s required service period. See Note 15: Equity-Based Compensation Plans for more information about our equity-based compensation.
Inventories	INVENTORIES
	Inventories are stated at the lower of cost or market. The last-in, first-out method is used to determine cost of logs, lumber and plywood for most of our operations. The average cost method is used to determine cost of all other inventories. Expenses associated with idle capacity or other curtailments of production are reflected in cost of goods sold in the periods incurred.
Property, Plant and Equipment	PROPERTY, PLANT AND EQUIPMENT
	Property, plant and equipment are valued at cost less accumulated depreciation. Depreciation of buildings, equipment and other depreciable assets is determined using the straight-line method of depreciation. Estimated useful lives range from 30 to 40 years for buildings and structures and 2 to 25 years for equipment.
	Major improvements and replacements of property are capitalized. Maintenance, repairs, and minor improvements and replacements are expensed. Upon retirement or other disposition of property, applicable cost and accumulated depreciation or amortization are removed from the accounts. Any gains or losses are included in earnings.
Timber and Timberland	TIMBER AND TIMBERLANDS
	Timber and timberlands are valued at cost less accumulated depletion and amortization. For fee timber, the capitalized cost includes costs related to stand establishment, including costs of preparing the land for planting, cost of seeds or seedlings, and tree planting, including labor, materials, depreciation of company-owned equipment and the cost of contract services. Upon completion of planting activities and field inspection to assure the planting operation was successful, a plantation will be considered “established.” Subsequent expenditures made to maintain the integrity or enhance the growth of an established plantation or stand are expensed. Post-establishment expenses include release spray treatments, pest control activities, thinning operations, fertilization and replanting seedlings lost through mortality. Expenditures for forest management consist of regularly recurring items necessary for ownership and administration of timber producing property such as fire protection, property taxes and insurance, silviculture costs incurred subsequent to stand establishment, cruising (physical inventory), property maintenance and salaries, supplies, travel, record-keeping and other normal recurring administrative personnel costs. These expenditures are accounted for as current operating expenses. Timberland acquisitions are capitalized and the cost is allocated to timberland, merchantable sawlogs, merchantable pulpwood, reproduction (young growth not merchantable), logging roads and other land improvements, generally based on relative appraised values.
	The aggregate estimated volume of current standing merchantable timber inventory is updated at least annually to reflect increases due to reclassification of young growth to merchantable timber when the young growth meets defined diameter specifications, the annual growth of merchantable timber and the acquisition of additional merchantable timber, and to reflect decreases due to timber harvests and land sales. Timber volumes are estimated from cruises of the timber tracts, which are completed on our timberlands on approximately a five to ten year cycle. Since the individual cruises collect field data at different times for specific sites, the growth model projects standing inventory from the cruise date to a common reporting date. Annual growth rates for the merchantable inventory have historically been in the range of 2%-5% in the North and 6%-9% in the South.
	Depletion represents the amount charged to expense as fee timber is harvested. Rates at which timber is depleted are calculated annually for each of our Resource regions by dividing the beginning of year balance of the timber accounts by the forest inventory volume, after inventory updates for growth projection adjustments and new timber cruises.
	The base cost of logging roads, such as the clearing, grading, and ditching, is not amortized and remains a capitalized item until obliteration or other disposition, while other portions of the initial cost, such as bridges, culverts and gravel surfacing are amortized over their useful lives, which range from 5 to 20 years. Costs associated with temporary logging roads that will not remain part of our road system are expensed as incurred.
Real Estate Sales	REAL ESTATE SALES
	Sales of non-core timberland are considered to be part of our normal operations. We therefore classify revenue and costs associated with real estate sold in revenues and cost of goods sold, respectively, in our Consolidated Statements of Income. Cash generated from real estate sales is included as an operating activity in our Consolidated Statements of Cash Flows.
Like-Kind Exchange and Restricted Cash	LIKE-KIND EXCHANGES AND RESTRICTED CASH
	In order to acquire and sell assets, primarily timberlands, in a tax efficient manner, we sometimes enter into like-kind exchange (LKE) tax-deferred transactions. There are two main types of LKE transactions: forward transactions, in which property is sold and the proceeds are reinvested by acquiring similar property; and reverse
	transactions, in which property is acquired and similar property is subsequently sold by us. Both forward and reverse transactions must be completed within prescribed time periods under Internal Revenue Code section 1031.
	We use a qualified intermediary to facilitate LKE transactions. Proceeds from forward transactions are held by the intermediary and are classified as restricted cash within non-current other assets, because we intend to reinvest the the funds in similar properties. If the acquisition of suitable LKE properties is not completed within 180 days of the sale of the company-owned property, the proceeds are distributed to us by the intermediary and are reclassified as available cash and applicable income taxes are determined. In the case of reverse transactions in which we have not yet completed LKE sales of company-owned land to match with property purchased on our behalf by the intermediary, the amount associated with the property purchased on our behalf but not yet matched with LKE sales is classified as a non-current asset and included in “Timber and timberlands, net” in our Consolidated Balance Sheets and as “Additions to timber and timberlands” in the investing activities section of our Consolidated Statements of Cash Flows.
Long-Lived Assets	LONG-LIVED ASSETS
	Our long-lived assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable, as measured by its undiscounted estimated future cash flows. We use our operational budgets to estimate future cash flows. The estimates are adjusted periodically to reflect changing business conditions. Impaired assets are written down to fair value. Assets to be disposed of are reported at the lower of carrying amount or fair value less cost to sell.
	We recognize a liability and an asset equal to the fair value of our legal obligations to perform asset retirement activities if the amount can be reasonably estimated. Our primary obligations relate to asbestos located within our manufacturing facilities and a landfill site. We have recorded assets and corresponding liabilities that are not material to our financial position or results of operations. We have also identified situations that would have resulted in the recognition of additional asset retirement obligations, except for an inability to reasonably estimate the fair value of the liability. Most of these situations relate to asbestos located within our manufacturing facilities where a settlement date or range of settlement dates cannot be specified. We review these obligations annually and do not expect them to have a material effect on our financial position, results of operations or cash flows.
Income Taxes	INCOME TAXES
	We use the asset and liability method of accounting for income taxes. Under this method, deferred tax assets and liabilities are recognized for the estimated future tax consequences attributable to differences between the financial statement carrying amounts of assets and liabilities and their respective tax bases, operating loss carryforwards and tax credit carryforwards. Deferred tax assets and liabilities are measured pursuant to tax laws using rates expected to apply to taxable income in the years in which the temporary differences are expected to be recovered or settled. We recognize the effect of a change in income tax rates on deferred tax assets and liabilities in the Consolidated Statements of Income and Consolidated Statements of Comprehensive Income in the period that includes the enactment date of the rate change. We record a valuation allowance to reduce the carrying amounts of deferred tax assets if it is more likely than not that such deferred tax assets will not be realized.
Revenue Recognition	REVENUE RECOGNITION
	We recognize revenue from the sale of timber when risk of loss transfers to the buyer and the quantity sold is determinable. These sales take the form of delivered logs, pay-as-cut contracts, timber deeds and lump sum contracts. On delivered log sales, revenue, which includes amounts billed for logging and hauling, is recognized at the point that logs are delivered and scaled. Revenue is recognized on timber deeds and lump sum contracts generally upon closing or when the contracts are effective, which is the point at which the buyer assumes risk of loss associated with the standing timber.
	We receive cash consideration in full and recognize revenue at closing on substantially all our real estate sales.
	We recognize revenue from the sale of manufactured wood products and residual by-products when there is persuasive evidence of a sales agreement, the price to the customer is fixed and determinable, collection is reasonably assured, and title and the risk of loss passes to the customer. Shipping terms generally indicate when title and the risk of loss have passed. Revenue is recognized at shipment for sales when shipping terms are FOB (free on board) shipping point. For sales where shipping terms are FOB destination, revenue is recognized when the goods are received by the customer.
	Revenue is recognized net of any sales taxes collected. Sales taxes, when collected, are recorded as a current liability and remitted to the appropriate governmental entities.
Shipping and Handling Costs	SHIPPING AND HANDLING COSTS
	Costs for shipping and handling are included in cost of goods sold in our Consolidated Statements of Income.

Earnings_per_Share_Tables

Earnings per Share (Tables)	12 Months Ended
	Dec. 31, 2014
Earnings Per Share, Basic, Other Disclosures [Abstract]
Reconciliation of Number of Common Shares Used in Calculating Basic and Diluted EPS	The following table reconciles the number of shares used in calculating the basic and diluted earnings per share for the years ended December 31:
	(Dollars in thousands, except per-share amounts)	2014		2013		2012
	Net income	$	89,910	$	70,581	$	42,594
	Basic weighted-average shares outstanding	40,748,924		40,502,878		40,333,333
	Incremental shares due to:
	Performance shares	117,830		133,766		134,079
	Restricted stock units	27,628		69,076		70,217
	Stock options	—		3,567		15,520
	Diluted weighted-average shares outstanding	40,894,382		40,709,287		40,553,149
	Basic net income per share	$	2.21	$	1.74	$	1.06
	Diluted net income per share	$	2.2	$	1.73	$	1.05
	Anti-dilutive shares excluded from the calculation:
	Performance shares	—		3,441		—
	Restricted stock units	1,216		—		315
	Total anti-dilutive shares excluded from the calculation	1,216		3,441		315

Inventories_Inventories_Tables

Inventories Inventories (Tables)	12 Months Ended
	Dec. 31, 2014
Inventory Disclosure [Abstract]
Schedule of inventory
	(Dollars in thousands)	2014		2013
	Logs	$	7,930	$	14,975
	Lumber and other manufactured wood products	17,286		15,967
	Materials and supplies	6,274		5,333
		$	31,490	$	36,275
	Valued at lower of cost or market:
	Last-in, first-out basis	$	16,874	$	23,250
	Average cost basis	14,616		13,025
	Total inventories	$	31,490	$	36,275

Property_Plant_and_Equipment_T

Property, Plant and Equipment (Tables)	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Schedule of Property, Plant and Equipment
	(Dollars in thousands)	2014			2013
	Land and land improvements	$	18,374		$	17,201
	Buildings and structures	36,174			33,985
	Machinery and equipment	176,085			171,385
	Construction in progress	5,878			1,225
		236,511			223,796
	Less: accumulated depreciation	(170,762		)	(163,820		)
	Total property, plant and equipment	$	65,749		$	59,976

Timber_and_TimberlandsTables

Timber and Timberlands(Tables)	12 Months Ended
	Dec. 31, 2014
Timber and Timberlands [Abstract]
Schedule of Timber and Timberlands
	(Dollars in thousands)	2014		2013
	Timber and timberlands	$	760,431	$	391,916
	Logging roads	67,989		63,955
	Total timber and timberlands	$	828,420	$	455,871

Other_Assets_Tables

Other Assets (Tables)	12 Months Ended
	Dec. 31, 2014
Other Assets [Abstract]
Schedule of Other Assets, Current
	Current Other Assets
	(Dollars in thousands)	2014		2013
	Basis of real estate held for sale	$	11,529	$	10,010
	Deferred charges	1,172		1,008
	Prepaid expenses	2,364		943
	Total current other assets	$	15,065	$	11,961
Schedule of Other Assets, Noncurrent
	Noncurrent Other Assets
	(Dollars in thousands)	2014		2013
	Deferred charges	$	6,697	$	5,668
	Noncurrent investments	911		3,144
	Derivative asset associated with interest rate swaps	421		1,830
	Developed land	1,733		1,733
	Other	599		363
	Total noncurrent other assets	$	10,361	$	12,738

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Schedule of the Income Tax Provision Allocated to Continuing Operations	Income tax expense consists of the following for the years ended December 31:
	(Dollars in thousands)	2014			2013			2012
	Current	$	21,205		$	16,352		$	292
	Deferred	(2,143		)	(2,754		)	8,197
	Net operating loss carryforwards	625			287			8,320
	Income taxes	$	19,687		$	13,885		$	16,809
Schedule of Effective Income Tax Rate Reconciliation	Income tax expense differs from the amount computed by applying the statutory federal income tax rate of 35% to income before income taxes due to the following for the years ended December 31:
	(Dollars in thousands)	2014			2013			2012
	U.S. federal statutory income tax	$	38,359		$	29,563		$	20,791
	REIT income not subject to federal income tax	(16,812		)	(13,918		)	(5,241		)
	Change in valuation allowance	(1,818		)	(683		)	—
	State income taxes, net of federal income tax	2,234			942			1,615
	Domestic production activities deduction	(1,055		)	(1,579		)	—
	Permanent book-tax differences	(1,073		)	(384		)	(413		)
	All other items	(148		)	(56		)	57
	Income taxes	$	19,687		$	13,885		$	16,809
	Effective tax rate	18		%	16.4		%	28.3		%
Schedule of Deferred Tax Assets and Liabilities	The tax effects of significant temporary differences creating deferred tax assets and liabilities at December 31 were:
	(Dollars in thousands)	2014			2013
	Deferred tax assets:
	Pensions	$	31,527		$	16,807
	Postretirement employee benefits	16,209			18,464
	Inventories	2,720			2,636
	Incentive compensation	2,544			2,807
	Nondeductible accruals	2,033			2,405
	Tax credits	1,904			2,135
	Employee benefits	1,839			1,586
	Net operating loss carryforwards	142			1,056
	Other	224			200
	Total deferred tax assets	59,142			48,096
	Valuation allowance	—			(2,184		)
	Deferred tax assets, net of valuation allowance	59,142			45,912
	Deferred tax liabilities:
	Timber and timberlands	(5,120		)	(5,871		)
	Property, plant and equipment	(10,626		)	(10,741		)
	Total deferred tax liabilities	(15,746		)	(16,612		)
	Net deferred tax assets	$	43,396		$	29,300
	Net deferred tax assets and liabilities consist of:
	(Dollars in thousands)	2014			2013
	Current deferred tax assets	$	6,168		$	7,724
	Noncurrent deferred tax assets	37,228			21,576
	Net deferred tax assets	$	43,396		$	29,300
Summary of Tax Years Subject to Examination by Major Taxing Jurisdictions	The following table summarizes the tax years subject to examination by major taxing jurisdictions:
	Jurisdiction	Years
	Federal	2011	-	2014
	Arkansas	2011	-	2014
	Michigan	2010	-	2014
	Minnesota	2010	-	2014
	Idaho	2011	-	2014

Debt_Tables

Debt (Tables)	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments	The following table presents our long-term debt as of December 31:
	(Dollars in thousands)	2014			2013
	Term loans, variable rate 1.88% to 2.13% due 2019 through 2021 and fixed rate 2.95% to 4.64% due 2017 through 2024	$	322,000		$	12,000
	Senior Notes, 7.50%, due 2019	150,000			150,000
	Revenue bonds, 5.90% to 6.95%, due 2024 and 2026	108,335			108,335
	Debentures, 6.95%, due 2015	22,500			22,500
	Medium-term notes, 8.75% to 8.89%, due 2016 through 2022	27,250			27,250
		630,085			320,085
	Interest rate swaps	793			1,830
	Less unamortized discounts	(1,535		)	(1,823		)
		629,343			320,092
	Less current portion	(22,870		)	—
	Long-term debt	$	606,473		$	320,092
Schedule of Maturities of Long-term Debt	Scheduled principal payments due on long-term debt during each of the five years subsequent to December 31, 2014, are as follows:
	(Dollars in thousands)
	2015	$	22,500
	2016	5,000
	2017	11,000
	2018	14,250
	2019	190,000

Accounts_Payable_and_Accrued_L1

Accounts Payable and Accrued Liabilities (Tables)	12 Months Ended
	Dec. 31, 2014
Accounts Payable and Accrued Liabilities [Abstract]
Schedule of Accounts Payable and Accrued Liabilities
	(Dollars in thousands)	2014		2013
	Wages, salaries and employee benefits	$	14,667	$	15,908
	Trade accounts payable	5,656		7,702
	Taxes other than income taxes	5,663		6,247
	Interest	4,811		4,018
	Logging related expenses	2,983		1,600
	Deferred recreational lease income	1,616		880
	Freight	740		802
	Book overdrafts	4,385		2,920
	Other	2,543		3,540
	Total	$	43,064	$	43,617

Other_LongTerm_Obligations_Tab

Other Long-Term Obligations (Tables)	12 Months Ended
	Dec. 31, 2014
Other Long-term Debt [Abstract]
Schedule of Other Long-Term Obligations
	(Dollars in thousands)	2014		2013
	Employee benefits and related liabilities	$	8,839	$	15,423
	Cost share logging roads	5,894		5,759
	Other	1,019		1,171
	Total	$	15,752	$	22,353

Financial_Instruments_and_Conc1

Financial Instruments and Concentration of Risk (Tables)	12 Months Ended
	Dec. 31, 2014
Derivative Instrument Detail [Abstract]
Estimated Fair Value of Financial Instruments	Estimated fair values of our financial instruments as of December 31 are as follows:
		2014						2013
	(Dollars in thousands)	CARRYING			FAIR			CARRYING			FAIR
		AMOUNT			VALUE			AMOUNT			VALUE
	Cash and short-term investments (Level 1)	$	31,012		$	31,012		$	57,837		$	57,837
	Net derivative asset related to interest rate swaps (Level 2)	793			793			1,830			1,830
	Long-term debt (including current portion of long-term debt and fair value adjustments related to fair value swaps) (Level 2)	629,343			657,943			320,092			347,869
	Company owned life insurance (COLI) (Level 3)	877			877			3,110			3,110
Fair Values of Derivative Instruments	The fair values of derivative instruments on our Consolidated Balance Sheets as of December 31 are as follows:
		DERIVATIVE ASSETS
			2014			2013
	(Dollars in thousands)	BALANCE SHEET	FAIR VALUE			FAIR VALUE
		LOCATION
	Derivatives designated as hedging instruments:
	Interest rate contracts	Other noncurrent assets	$	793		$	1,830
	Total derivatives designated as hedging instruments		$	793		$	1,830
Effect of Derivatives on the Consolidated Statements of Operations	The effect of derivatives on the Consolidated Statements of Income for the years ended December 31, 2014, 2013 and 2012 are as follows:
		LOCATION OF GAIN (LOSS) RECOGNIZED  IN INCOME	AMOUNT OF GAIN (LOSS)
			RECOGNIZED IN INCOME
	(Dollars in thousands)		2014			2013			2012
	Derivatives designated in fair value hedging relationships:
	Interest rate contracts
	Realized gain on hedging instrument1	Interest expense	$	979		$	960		$	868
	Net gain recognized in income from fair value hedges		$	979		$	960		$	868
	Derivatives not designated as hedging instruments:
	Lumber contracts
	Unrealized loss on derivative	Cost of goods sold	$	—		$	—		$	(480	)
	Realized loss on derivative	Cost of goods sold	—			—			(396		)
	Net loss recognized in income from derivatives not designated as hedging instruments		$	—		$	—		$	(876	)
	1	Realized gain on hedging instrument consists of net cash settlements and interest accruals on the interest rate swaps during the period.

Savings_Plans_Pension_Plans_an1

Savings Plans, Pension Plans and Other Postretirement Employee Benefits (Tables)	12 Months Ended
	Dec. 31, 2014
General Discussion of Pension and Other Postretirement Benefits [Abstract]
Schedule of Changes in Projected Benefit Obligations	The change in benefit obligation, change in plan assets and funded status for company-sponsored benefit plans and obligations are as follows:
		PENSION PLANS						OTHER POSTRETIREMENT
								EMPLOYEE BENEFITS (OPEB)
	(Dollars in thousands)	2014			2013			2014			2013
	Benefit obligation at beginning of year	$	(393,565	)	$	(445,535	)	$	(47,343	)	$	(52,033	)
	Service cost	(5,081		)	(5,318		)	(25		)	(94		)
	Interest cost	(19,184		)	(17,826		)	(1,741		)	(1,810		)
	Plan amendments	—			—			—			—
	Actuarial loss (gain)	(49,990		)	41,178			3,229			2,692
	Benefits paid	50,126			33,936			4,319			3,902
	Benefit obligation at end of year	$	(417,694	)	$	(393,565	)	$	(41,561	)	$	(47,343	)
	Fair value of plan assets at beginning of year	$	350,588		$	345,633		$	—		$	—
	Actual return on plan assets	31,280			37,157			—			—
	Employer contributions and benefit payments	5,317			1,734			4,319			3,902
	Benefits paid	(50,126		)	(33,936		)	(4,319		)	(3,902		)
	Fair value of plan assets at end of year	$	337,059		$	350,588		$	—		$	—
	Amounts recognized in the consolidated balance sheets:
	Current liabilities	$	(1,774	)	$	(1,772	)	$	(4,486	)	$	(4,929	)
	Noncurrent liabilities	(78,861		)	(41,205		)	(37,075		)	(42,414		)
	Funded status	$	(80,635	)	$	(42,977	)	$	(41,561	)	$	(47,343	)
Schedule of Weighted Average Asset Allocations of the Pension Benefit Plans' Assets	The asset allocations of the pension benefit plans’ assets at December 31 by asset category are as follows:
		PENSION PLANS
	ASSET CATEGORY	2014		2013
	Domestic equity securities	14	%	20	%
	Global/international equity securities	22		27
	Fixed income securities	48		38
	Other	16		15
	Total	100	%	100	%
Schedule of Allocation of Plan Assets	Fair value measurements at December 31, 2014:
	(Dollars in thousands)
	ASSET CATEGORY	QUOTED PRICES IN			SIGNIFICANT			SIGNIFICANT			TOTAL
		ACTIVE MARKETS FOR			OBSERVABLE			UNOBSERVABLE
		IDENTICAL ASSETS			INPUTS			INPUTS
		(LEVEL 1)			(LEVEL 2)			(LEVEL 3)
	Cash and equivalents	$	6,586		$	—		$	—		$	6,586
	Equity securities:
	U.S. small/mid cap1	1,136			—			—			1,136
	International companies	13,782			—			—			13,782
	Mutual funds2	226,710						—			226,710
	Collective investments:
	U.S. large cap3	—			30,005			—			30,005
	Developed markets4	—			29,879			—			29,879
	Emerging markets5	—			28,961			—			28,961
	Total	$	248,214		$	88,845		$	—		$	337,059
	1	These are managed investments in US small/mid cap equities that track the Russell 2500 Growth index.
	2	The mutual funds were 72% invested in high-quality intermediate and long-term investment grade securities, 22% invested in a diversified portfolio of fixed-income instruments of varying maturities, which may be represented by forwards or derivatives such as options, futures contracts or swap agreements and debt securities, and 6% invested in US small/mid cap equities that track the Russell 2500 Growth index.
	3	These collective investments are invested in US large cap equities that track the S&P 500.
	4	These collective investments are invested in equity funds of developed markets outside of the US & Canada, that track the MSCI EAFE Value or MSCI EAFE Growth index.
	5	These collective investments are invested in equity funds of emerging markets outside of the US & Canada, that track the MSCI Emerging Markets index.
	Fair value measurements at December 31, 2013:
	(Dollars in thousands)
	ASSET CATEGORY	QUOTED PRICES IN			SIGNIFICANT			SIGNIFICANT			TOTAL
		ACTIVE MARKETS FOR			OBSERVABLE			UNOBSERVABLE
		IDENTICAL ASSETS			INPUTS			INPUTS
		(LEVEL 1)			(LEVEL 2)			(LEVEL 3)
	Cash and equivalents	$	9,673		$	—		$	—		$	9,673
	Equity securities:
	U.S. large cap1	32,304			—			—			32,304
	U.S. small/mid cap2	19,053			—			—			19,053
	International companies	34,773			—			—			34,773
	Mutual funds3	185,505			—			—			185,505
	Collective investments:
	Developed markets4	—			17,401			—			17,401
	Emerging markets5	—			41,300			—			41,300
	Hedge funds6	—			—			10,579			10,579
	Total	$	281,308		$	58,701		$	10,579		$	350,588
	1	These are managed investments in US large cap equities that track the Russell 1000 Value index.
	2	These are managed investments in US small/mid cap equities that track the Russell 2500 Growth index.
	3	The mutual funds were 50% invested in high-quality intermediate and long-term investment grade securities and 50% invested in a diversified portfolio of fixed-income instruments of varying maturities, which may be represented by forwards or derivatives such as options, futures contracts or swap agreements and debt securities.
	4	These collective investments are invested in equity funds of developed markets outside of the US & Canada, that track the MSCI EAFE index.
	5	These collective investments are invested in equity funds of emerging markets outside of the US & Canada, that track the MSCI Emerging Markets index.
	6	The hedge funds are 37% invested in long/short and event-driven equity, 24% invested in long and short credit, 11% in relative value, 10% invested in distressed debt, 6% invested in convertible bond hedging, with the remaining 13% in other investments.
Schedule of Summary of Changes in the Fair Value of the Plans' Level 3 Assets	The following table sets forth a summary of changes in the fair value of the plans’ Level 3 assets for the years ended December 31:
		Hedge Funds
	(Dollars in thousands)	2014			2013
	Balance, beginning of year	$	10,579		$	45,693
	Sales and settlements	(10,579		)	(34,500		)
	Unrealized losses relating to assets still held at the reporting date	—			(614		)
	Balance, end of year	$	—		$	10,579
Schedule of Net Benefit Costs	Pre-tax components of net periodic cost (benefit) recognized in our Consolidated Statements of Income were as follows:
		PENSION PLANS									OTHER POSTRETIREMENT
											EMPLOYEE BENEFITS
	(Dollars in thousands)	2014			2013			2012			2014			2013			2012
	Service cost	$	5,081		$	5,318		$	5,238		$	25		$	94		$	284
	Interest cost	19,184			17,826			19,986			1,741			1,810			2,478
	Expected return on plan assets	(24,512		)	(26,092		)	(28,755		)	—			—			—
	Curtailment credit	—			—			—			—			—			(103		)
	Amortization of prior service cost (credit)	748			779			770			(9,641		)	(9,708		)	(9,343		)
	Amortization of actuarial loss	14,451			19,929			15,356			2,186			3,209			3,127
	Net periodic cost (benefit)	$	14,952		$	17,760		$	12,595		$	(5,689	)	$	(4,595	)	$	(3,557	)
Schedule of Amounts Recognized in Other Comprehensive Income (Loss)	Other amounts recognized in our Consolidated Statements of Comprehensive Income were as follows:
		PENSION PLANS									OTHER POSTRETIREMENT
											EMPLOYEE BENEFITS
	(Dollars in thousands)	2014			2013			2012			2014			2013			2012
	Net amount at beginning of year	$	117,167		$	161,667		$	158,883		$	(18,447	)	$	(20,769	)	$	(18,001	)
	Amounts arising during the period:
	Net loss (gain)	43,223			(52,242		)	20,180			(3,229		)	(2,692		)	(4,878		)
	Prior service cost (credit)	—			—			510			—			—			(5,942		)
	Taxes	(16,857		)	20,374			(8,069		)	1,259			1,050			4,260
	Net amount arising during the period	26,366			(31,868		)	12,621			(1,970		)	(1,642		)	(6,560		)
	Amounts reclassified during the period:
	Amortization of prior service (cost) credit	(748		)	(779		)	(770		)	9,641			9,708			9,343
	Amortization of actuarial loss	(14,451		)	(19,929		)	(15,356		)	(2,186		)	(3,209		)	(3,127		)
	Taxes	5,927			8,076			6,289			(2,907		)	(2,535		)	(2,424		)
	Net reclassifications during the period	(9,272		)	(12,632		)	(9,837		)	4,548			3,964			3,792
	Net amount at end of year	$	134,261		$	117,167		$	161,667		$	(15,869	)	$	(18,447	)	$	(20,769	)
Schedule of Accumulated Other Comprehensive Income (Loss)	Amounts recognized in accumulated other comprehensive loss on our Consolidated Balance Sheets, net of tax, consist of:
		PENSION PLANS						OTHER POSTRETIREMENT
								EMPLOYEE BENEFITS
	(Dollars in thousands)	2014			2013			2014			2013
	Net loss	$	134,717		$	115,404		$	(21,750	)	$	16,490
	Prior service cost (credit)	(456		)	1,763			5,881			(34,937		)
	Net amount recognized	$	134,261		$	117,167		$	(15,869	)	$	(18,447	)
Schedule of Expected Future Benefit Payments	Estimated future benefit payments, which reflect expected future service are as follows for the years indicated:
	(Dollars in thousands)	PENSION PLANS			OTHER POSTRETIREMENT
					EMPLOYEE BENEFITS
	2015	$	29,566		$	4,486
	2016		29,342			4,293
	2017		29,167			4,044
	2018		29,049			3,789
	2019		29,031			3,541
	2020 – 2024		143,681			14,600
Weighted Average Assumptions Used to Determine the Benefit Obligation	The weighted average assumptions used to determine the benefit obligation as of December 31 were:
		PENSION PLANS						OTHER POSTRETIREMENT
								EMPLOYEE BENEFITS
		2014		2013		2012		2014		2013		2012
	Discount rate	4.25	%	5.1	%	4.15	%	3.9	%	4.45	%	3.7	%
	Rate of salaried compensation increase	3	%	3	%	3.5	%	—		—		—
Schedule of Weighted Average Assumptions Used to Determine the Net Periodic Benefit (Cost)	The weighted average assumptions used to determine the net periodic benefit (cost) for the years ended December 31 were:
		PENSION PLANS						OTHER POSTRETIREMENT
								EMPLOYEE BENEFITS
		2014		2013		2012		2014		2013		2012
	Discount rate	5.1	%	4.15	%	4.95	%	4.45	%	3.7	%	4.85	%
	Expected return on plan assets	7.5	%	8	%	8	%	—		—		—
	Rate of salaried compensation increase	3	%	3.5	%	3.5	%	—		—		—
Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates	A one percentage point change in the health care cost trend rates would have the following effects on our December 31, 2014 Consolidated Financial Statements:
	(Dollars in thousands)	1% INCREASE			1% DECREASE
	Effect on total service cost plus interest cost	$	5		$	(5	)
	Effect on accumulated postretirement benefit obligation	112			(112		)

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Schedule of Future Minimum Rental Payments for Operating Leases	As of December 31, 2014, the future minimum rental payments required under our operating leases are as follows:
	(Dollars in thousands)
	2015	$	4,211
	2016	3,148
	2017	1,904
	2018	1,123
	2019	452
	2020 and thereafter	1,355
	Total	$	12,193
Schedule of Environmental Loss Contingencies by Site	The following table details our Avery Landing environmental remediation reserve balance for the years ended December 31:
	(Dollars in thousands)	2014		2013
	Beginning reserve balance	$	—	$	4,250
	Environmental remediation charge	—		3,522
	Cash payments	—		(7,772		)
	Ending reserve balance	$	—	$	—

EquityBased_Compensation_Plans1

Equity-Based Compensation Plans (Tables)	12 Months Ended
	Dec. 31, 2014
Share-based Compensation [Abstract]
Details of Compensation Expense	The following table details our compensation expense and the related income tax benefit as of December 31:
	(Dollars in thousands)	2014			2013			2012
	Employee equity-based compensation expense:
	Performance shares	3,515			3,635			3,440
	Restricted stock units	622			742			627
	Total employee equity-based compensation expense	$	4,137		$	4,377		$	4,067
	Deferred compensation stock equivalent units expense	$	345		$	1,265		$	2,008
	Total tax benefit recognized for shared-based payment awards	$	280		$	71		$	525
Fair Value of Performance Share Awards	The following table presents the key inputs used in calculating the fair value of the performance share awards in 2014, 2013 and 2012, and the resulting fair values:
		2014			2013			2012
	Shares granted	87,441			83,111			85,028
	Stock price as of valuation date	$	39.76		$	45.31		$	31.11
	Risk-free rate	0.72		%	0.4		%	0.4		%
	Fair value of a performance share	$	45.57		$	62.78		$	34.24
Summary of Outstanding Performance Share Awards	The following table summarizes outstanding performance share awards as of December 31, 2014, 2013 and 2012, and changes during those years:
	(Dollars in thousands, except	2014						2013					2012
	per-share amounts)	SHARES			WEIGHTED AVG.			SHARES			WEIGHTED AVG.		SHARES			WEIGHTED AVG.
					GRANT DATE						GRANT DATE					GRANT DATE
					FAIR VALUE						FAIR VALUE					FAIR VALUE
	Unvested shares outstanding at January 1	155,814			$	48.73		160,214			$	44.5	154,594			$	50.54
	Granted	87,441			45.57			83,111			62.78		85,028			34.24
	Vested	(76,202		)	34.24			(71,861		)	55.84		(76,812		)	45.3
	Forfeited	(6,820		)	49.75			(15,650		)	47.32		(2,596		)	44.99
	Unvested shares outstanding at December 31	160,233			53.86			155,814			48.73		160,214			44.5
	Total grant date fair value of share awards vested during the year	$	2,609					$	4,013				$	3,480
	Aggregate intrinsic value of unvested share awards at December 31	$	6,709					$	6,504				$	6,019
Summary of Outstanding RSU Awards	A summary of the status of outstanding RSU awards as of December 31, 2014, 2013 and 2012, and changes during these years is presented below:
		2014						2013					2012
		SHARES			WEIGHTED AVERAGE GRANT DATE			SHARES			WEIGHTED AVERAGE GRANT DATE		SHARES			WEIGHTED AVERAGE GRANT DATE
					FAIR VALUE						FAIR VALUE					FAIR VALUE
	Unvested shares outstanding at January 1	37,461			$	38.69		40,219			$	34.82	36,359			$	35.6
	Granted	19,599			40.51			23,449			44.41		20,225			31.53
	Vested	(21,333		)	34.46			(19,796		)	38.19		(14,861		)	32.41
	Forfeited	(3,272		)	42.06			(6,411		)	36.91		(1,504		)	33.36
	Unvested shares outstanding at December 31	32,455			42.24			37,461			38.69		40,219			34.82
	Total grant date fair value of RSU awards vested during the year (in thousands)	$	735					$	756				$	482
	Aggregate intrinsic value of unvested RSU awards at December 31 (in thousands)	$	1,359					$	2,511				$	1,575
Summary of Outstanding Stock Options	A summary of the status of outstanding stock options as of December 31, 2014, 2013 and 2012 and changes during those years is presented below:
		2014						2013					2012
		SHARES			WEIGHTED AVG.			SHARES			WEIGHTED AVG.		SHARES			WEIGHTED AVG.
					EXERCISE PRICE						EXERCISE PRICE					EXERCISE PRICE
	Outstanding at January 1	12,859			$	30.92		83,827			$	27.46	144,684			$	23.34
	Shares exercised	(12,859		)	30.92			(70,968		)	26.25		(60,857		)	17.66
	Outstanding and exercisable at December 31	—						12,859			30.92		83,827			27.46
	Total intrinsic value of options exercised during the year (in thousands)	$	150					$	1,423				$	938

Segment_Information_Tables

Segment Information (Tables)	12 Months Ended
	Dec. 31, 2014
Segment Reporting Information, Additional Information [Abstract]
Summary of Information by Business Segment	The following table presents business segment information for each of the past three years. Corporate information is included to reconcile segment data to the Consolidated Financial Statements.
	(Dollars in thousands)	2014			2013			2012
	Revenues:
	Resource	$	252,581		$	238,228		$	207,846
	Wood Products	376,239			366,015			329,404
	Real Estate	40,460			26,160			38,238
		669,280			630,403			575,488
	Elimination of intersegment revenues - Resource1	(62,330		)	(60,114		)	(50,354		)
	Total consolidated revenues	$	606,950		$	570,289		$	525,134
	Operating Income:
	Resource	$	84,976		$	73,425		$	49,543
	Wood Products	52,442			58,892			45,456
	Real Estate	26,945			18,266			28,056
	Eliminations and adjustments	(190		)	(907		)	(1,061		)
		164,173			149,676			121,994
	Corporate	(31,667		)	(42,078		)	(37,052		)
	Operating income	132,506			107,598			84,942
	Interest expense, net	(22,909		)	(23,132		)	(25,539		)
	Income before income taxes	$	109,597		$	84,466		$	59,403
	Depreciation, depletion and amortization:
	Resource	$	17,847		$	18,103		$	16,446
	Wood Products	6,176			6,194			6,538
	Real Estate	59			56			36
		24,082			24,353			23,020
	Corporate	2,667			2,609			3,227
	Total depreciation, depletion and amortization	$	26,749		$	26,962		$	26,247
	Basis of real estate sold:
	Real Estate	$	9,355		$	3,536		$	5,413
	Elimination and adjustments	(709		)	(632		)	(365		)
	Total basis of real estate sold	$	8,646		$	2,904		$	5,048
	Assets:
	Resource and Real Estate2	$	847,873		$	476,628		$	477,271
	Wood Products	118,674			115,664			100,190
		966,547			592,292			577,461
	Corporate	68,874			88,238			141,436
	Total consolidated assets	$	1,035,421		$	680,530		$	718,897
	Capital Expenditures:3
	Resource and Real Estate	$	11,116		$	12,449		$	12,138
	Wood Products	12,551			9,013			4,427
		23,667			21,462			16,565
	Corporate	565			1,131			845
	Total capital expenditures	$	24,232		$	22,593		$	17,410
	1	Intersegment revenues for 2012-2014, which were based on prevailing market prices, consisted of logs sold by our Resource segment to the Wood Products segment.
	2	Assets are shown on a combined basis for the Resource and Real Estate segments, as we do not produce information separately for those segments for internal purposes.
	3	Excludes acquisition of timber and timberlands.
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area	All of our wood products facilities and all other assets are located within the continental United States. We sell and ship products to Canada and Mexico. Geographic information regarding our revenues is summarized as follows:
	(Dollars in thousands)	2014			2013			2012
	United States	$	601,738		$	558,138		$	516,466
	Canada	2,618			9,645			5,180
	Mexico	2,594			2,506			3,488
	Total consolidated revenues	$	606,950		$	570,289		$	525,134

Financial_Resutls_by_Quarter_T

Financial Resutls by Quarter (Tables)	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Data [Abstract]
Schedule of Quarterly Financial Information
		THREE MONTHS ENDED
	(Dollars in thousands, except per-share amounts)	MARCH 31				JUNE 30				SEPTEMBER 30				DECEMBER 31
		2014		2013		2014		2013		2014		2013		2014		2013
	Revenues	$	139,579	$	139,253	$	143,919	$	133,212	$	177,215	$	157,869	$	146,237	$	139,955
	Operating income	31,309		26,608		29,725		29,441		44,869		30,904		26,603		20,645
	Net income	20,350		15,487		16,270		19,182		33,154		22,191		20,136		13,721
	Net income per share1
	Basic	$	0.5	$	0.38	$	0.4	$	0.47	$	0.81	$	0.55	$	0.49	$	0.34
	Diluted	0.5		0.38		0.4		0.47		0.81		0.54		0.49		0.34
	1	Per-share amounts are computed independently for each of the quarters presented. Therefore, the sum of the quarterly per-share amounts may not equal the total computed for the year.

Summary_of_Principal_Accountin2

Summary of Principal Accounting Policies Summary of Principal Accounting Policies (Details)	12 Months Ended
	Dec. 31, 2014
	acre
Principle Accounting Policies [Line Items]
Timber And Timberlands Acres Owned	1,600,000
Buildings and Structures Useful Life Minimum	30 years 0 months 0 days
Buildings and Structures Useful Life Maximum	40 years 0 months 0 days
Equipment Useful Life Minimum	2 years 0 months 0 days
Equipment Useful Life Maximum	25 years 0 months 0 days
Bridges, Culverts and Gravel Surfacing Useful Life Minimum	5 years 0 months 0 days
Bridges, Culverts and Gravel Surfacing Useful Life Maximum	20 years 0 months 0 days
Northern United States [Member]
Principle Accounting Policies [Line Items]
Historic Average Annual Growth Rate for Merchantable Inventory Range, Minimum	2.00%
Historic Average Annual Growth Rate for Mechantable Inventory Range, Maximum	5.00%
Southern United States [Member]
Principle Accounting Policies [Line Items]
Historic Average Annual Growth Rate for Merchantable Inventory Range, Minimum	6.00%
Historic Average Annual Growth Rate for Mechantable Inventory Range, Maximum	9.00%

Earnings_per_Share_Reconciliat

Earnings per Share (Reconciliation Of Number Of Common Shares Used In Calculating Basic And Diluted EPS) (Details) (USD $)	3 Months Ended																12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings per Share [Line Items]
Net income	$20,136		$33,154		$16,270		$20,350		$13,721		$22,191		$19,182		$15,487		$89,910	$70,581	$42,594
Basic weighted-average shares outstanding (in shares)																	40,748,924	40,502,878	40,333,333
Diluted weighted-average shares outstanding (in shares)																	40,894,382	40,709,287	40,553,149
Basic net income per share (in dollars per share)	$0.49	[1]	$0.81	[1]	$0.40	[1]	$0.50	[1]	$0.34	[1]	$0.55	[1]	$0.47	[1]	$0.38	[1]	$2.21	$1.74	$1.06
Diluted net income per share (in dollars per share)	$0.49	[1]	$0.81	[1]	$0.40	[1]	$0.50	[1]	$0.34	[1]	$0.54	[1]	$0.47	[1]	$0.38	[1]	$2.20	$1.73	$1.05
Anti-dilutive shares excluded from the calculation (in shares)																	1,216	3,441	315
Performance Shares [Member]
Earnings per Share [Line Items]
Incremental shares (in shares)																	117,830	133,766	134,079
Anti-dilutive shares excluded from the calculation (in shares)																	0	3,441	0
Restricted Stock Units (RSUs) [Member]
Earnings per Share [Line Items]
Incremental shares (in shares)																	27,628	69,076	70,217
Anti-dilutive shares excluded from the calculation (in shares)																	1,216	0	315
Stock Options [Member]
Earnings per Share [Line Items]
Incremental shares (in shares)																	0	3,567	15,520
[1]	1 Per-share amounts are computed independently for each of the quarters presented. Therefore, the sum of the quarterly per-share amounts may not equal the total computed for the year.

Inventories_Details

Inventories (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Inventory Disclosure [Abstract]
Logs	$7,930,000	$14,975,000
Lumber and other manufactured wood products	17,286,000	15,967,000
Materials and supplies	6,274,000	5,333,000
Inventories, Total	31,490,000	36,275,000
Last-in, first-out basis	16,874,000	23,250,000
Average cost basis	14,616,000	13,025,000
Last-In, First-Out Reserve	$11,000,000	$11,300,000	$10,600,000

Property_Plant_and_Equipment_D

Property, Plant and Equipment (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Land and land improvements	$18,374,000	$17,201,000
Buildings and structures	36,174,000	33,985,000
Machinery and equipment	176,085,000	171,385,000
Construction in progress	5,878,000	1,225,000
Property, Plant and Equipment, Gross	236,511,000	223,796,000
Less: accumulated depreciation	-170,762,000	-163,820,000
Property, Plant and Equipment, Net	65,749,000	59,976,000
Depreciation	$8,100,000	$8,200,000	$8,800,000

Timber_and_Timberlands_Details

Timber and Timberlands (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Timber and Timberlands [Line Items]
Timber and timberlands	$760,431,000	$391,916,000
Logging roads	67,989,000	63,955,000
Timber and Timberlands, Net	828,420,000	455,871,000
Amortization of Logging Roads	2,800,000	2,700,000	2,600,000
Depletion from Company Owned Lands	$14,500,000	$14,600,000	$12,900,000

Timber_and_Timberlands_Narrati

Timber and Timberlands (Narrative) (Details) (USD $)	0 Months Ended
	Dec. 07, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 05, 2014	Dec. 31, 2012
	acre
Property, Plant and Equipment [Line Items]
Long-term Debt, Gross		$629,343,000	$320,092,000
Payments under timber cutting contracts, due in 2015		2,000,000
Payments under timber cutting contracts, due in 2016		2,600,000
Payments under timber cutting contracts, due in 2017		7,300,000
Payments under timber cutting contracts, due in 2018		2,500,000
Alabama and Mississippi [Member]
Property, Plant and Equipment [Line Items]
Acres aquired through timberland purchase	201,000
Payments to Acquire and Develop Real Estate	384,000,000
Term Loans [Member]
Property, Plant and Equipment [Line Items]
Long-term Debt, Gross		322,000,000	12,000,000	322,000,000	12,000,000
Term Loans [Member] | Alabama and Mississippi [Member]
Property, Plant and Equipment [Line Items]
Long-term Debt, Gross	$310,000,000			$310,000,000

Other_Assets_Current_and_Noncu

Other Assets (Current and Noncurrent Other Assets) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Other Assets [Abstract]
Basis of real estate held for sale	$11,529	$10,010
Deferred charges	1,172	1,008
Prepaid expenses	2,364	943
Total current other assets	15,065	11,961
Deferred charges	6,697	5,668
Noncurrent investments	911	3,144
Derivative asset associated with interest rate swaps	421	1,830
Developed land	1,733	1,733
Other	599	363
Total noncurrent other assets	$10,361	$12,738

Income_Taxes_Narrative_Details

Income Taxes (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Corporate taxation of built-in gains, subjection term	10 years
Recognition period before January 1, 2011 modified by the Small Business Jobs Act of 2010	5 years
Reduced holding period for sales modified by the American Taxpayer Relief Act of 2012	5 years
Statutory Federal Income Tax Rate	35.00%
Valuation allowance	$0	$2,184,000
Change in Valuation Allowance	1,800,000
Operating Loss Carryforwards	3,400,000
Idaho Investment Tax Credits	$2,900,000

Income_Taxes_Schedule_of_Incom

Income Taxes (Schedule of Income Tax Provision (Benefit)) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Current	$21,205	$16,352	$292
Deferred	-2,143	-2,754	8,197
Net operating loss carryforwards	625	287	8,320
Income taxes	$19,687	$13,885	$16,809

Income_Taxes_Schedule_of_Recon

Income Taxes (Schedule of Reconciliation of Income Tax Provision (Benefit)) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
U.S. federal statutory income tax	$38,359	$29,563	$20,791
REIT income not subject to federal income tax	-16,812	-13,918	-5,241
Change in valuation allowance	-1,818	-683	0
State income taxes, net of federal income tax	2,234	942	1,615
Domestic production activities deduction	-1,055	-1,579	0
Permanent Book-Tax Differences	-1,073	-384	-413
All other items	-148	-56	57
Income taxes	$19,687	$13,885	$16,809
Effective tax rate	18.00%	16.40%	28.30%

Income_Taxes_Schedule_of_Compo

Income Taxes (Schedule of Components of Deferred Income Tax Assets and Liabilities) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Income Tax Disclosure [Abstract]
Pensions	$31,527	$16,807
Postretirement employee benefits	16,209	18,464
Inventories	2,720	2,636
Incentive compensation	2,544	2,807
Nondeductible accruals	2,033	2,405
Tax credits	1,904	2,135
Employee benefits	1,839	1,586
Net operating loss carryforwards	142	1,056
Other	224	200
Total deferred tax assets	59,142	48,096
Valuation allowance	0	-2,184
Deferred tax assets, net of valuation allowance	59,142	45,912
Timber and timberlands	-5,120	-5,871
Property, plant and equipment	-10,626	-10,741
Total deferred tax liabilities	-15,746	-16,612
Net deferred tax assets	$43,396	$29,300

Income_Taxes_Schedule_of_Defer

Income Taxes (Schedule of Deferrred Income Tax Asset (Liability) Classification (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Income Tax Disclosure [Abstract]
Current deferred tax assets	$6,168	$7,724
Noncurrent deferred tax assets	37,228	21,576
Net deferred tax assets	$43,396	$29,300

Debt_Schedule_of_LongTerm_Debt

Debt (Schedule of Long-Term Debt) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 05, 2014	Dec. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Long-term debt, Including current installments on long-term debt	$629,343		$320,092
Debt Instrument, Face Amount	630,085		320,085
Debt Instrument, Unamortized Discount	-1,535		-1,823
Less current installments on long-term debt	-22,870		0
Long-term debt	606,473		320,092
Term loans, variable rate 1.88% to 2.13% due 2019 through 2021 and fixed rate 2.95% to 4.64% due 2017 through 2024
Debt Instrument [Line Items]
Long-term debt, Including current installments on long-term debt	322,000	322,000	12,000	12,000
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum	4.64%
Term loans, variable rate 1.88% to 2.13% due 2019 through 2021 and fixed rate 2.95% to 4.64% due 2017 through 2024 | Minimum [Member]
Debt Instrument [Line Items]
Interest Rate	1.88%
Term loans, variable rate 1.88% to 2.13% due 2019 through 2021 and fixed rate 2.95% to 4.64% due 2017 through 2024 | Maximum [Member]
Debt Instrument [Line Items]
Interest Rate	2.13%
Senior Notes, 7.50%, due 2019
Debt Instrument [Line Items]
Long-term debt, Including current installments on long-term debt	150,000		150,000
Interest Rate	7.50%
Revenue bonds, 5.90% to 6.95%, due 2024 and 2026
Debt Instrument [Line Items]
Long-term debt, Including current installments on long-term debt	108,335		108,335
Revenue bonds, 5.90% to 6.95%, due 2024 and 2026 | Minimum [Member]
Debt Instrument [Line Items]
Interest Rate	5.90%
Revenue bonds, 5.90% to 6.95%, due 2024 and 2026 | Maximum [Member]
Debt Instrument [Line Items]
Interest Rate	6.95%
Debentures, 6.95%, due 2015
Debt Instrument [Line Items]
Long-term debt, Including current installments on long-term debt	22,500		22,500
Interest Rate	6.95%
Medium-term notes, 8.75% to 8.89%, due 2016 through 2022
Debt Instrument [Line Items]
Long-term debt, Including current installments on long-term debt	27,250		27,250
Medium-term notes, 8.75% to 8.89%, due 2016 through 2022 | Minimum [Member]
Debt Instrument [Line Items]
Interest Rate	8.75%
Medium-term notes, 8.75% to 8.89%, due 2016 through 2022 | Maximum [Member]
Debt Instrument [Line Items]
Interest Rate	8.89%
Interest rate swaps
Debt Instrument [Line Items]
Long-term debt, Including current installments on long-term debt	$793		$1,830
Debt Instrument, Redemption, Period One [Member] | Term loans, variable rate 1.88% to 2.13% due 2019 through 2021 and fixed rate 2.95% to 4.64% due 2017 through 2024
Debt Instrument [Line Items]
Interest Rate				2.95%

Debt_Line_of_Credit_Details

Debt (Line of Credit) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014
Line of Credit Facility [Line Items]
Amout Available to Increase Borrowing Capacity	$250,000,000
Remaining Borrowing Capacity	248,600,000
Line of Credit [Member]
Line of Credit Facility [Line Items]
Maximum Borrowing Capacity	250,000,000
Line of Credit Facility, Amount Outstanding	0
Additional Applicable Rate Added to Base Rate, Minimum	1.30%
Additional Applicable Rate Added to Base Rate, At End of Period	0.30%
Unused Capacity, Commitment Fee Percentage	0.20%
Letter of Credit [Member]
Line of Credit Facility [Line Items]
Maximum Borrowing Capacity	40,000,000
Line of Credit Facility, Amount Outstanding	1,400,000
Swing Line Loan [Member]
Line of Credit Facility [Line Items]
Maximum Borrowing Capacity	$25,000,000
Minimum [Member] | Eurodollar [Member]
Line of Credit Facility [Line Items]
Interest Rate	0.88%
Minimum [Member] | Base Rate [Member]
Line of Credit Facility [Line Items]
Interest Rate	0.00%
Maximum [Member] | Eurodollar [Member]
Line of Credit Facility [Line Items]
Interest Rate	1.70%
Maximum [Member] | Base Rate [Member]
Line of Credit Facility [Line Items]
Interest Rate	0.70%

Debt_Additional_Details_Detail

Debt (Additional Details) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 05, 2014	Dec. 07, 2014
			Acquisiton
Debt Instrument [Line Items]
Long-term Debt, Gross	$629,343,000	$320,092,000
Timberland Acquisitions			2
Number of Tranches Included in Term Loan	6		2
Term Loan Tranche			6,000,000
Long-term Debt, Maturities, Repayments of Principal in Year Five	190,000,000
Term loans, variable rate 1.88% to 2.13% due 2019 through 2021 and fixed rate 2.95% to 4.64% due 2017 through 2024
Debt Instrument [Line Items]
Long-term Debt, Gross	322,000,000	12,000,000	12,000,000	322,000,000
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum	4.29%
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum	4.64%
Long-term Debt, Maturities, Repayments of Principal in Year Five	40,000,000
Long Term Debt Maturities Repayment of Principal in Year Six	40,000,000
Long Term Debt Maturities Repayment of Principal in Year Seven	40,000,000
Long Term Debt Maturities Repayment of Principal in Year Eight	40,000,000
Long Term Debt Maturities Repayment of Principal in Year Nine	40,000,000
Long-Term Debt, Maturities, Repayments of Principal In Year Ten	110,000,000
Revenue bonds, 5.90% to 7.75%, due 2024 and 2026 [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	108,335,000	108,335,000
Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	150,000,000	150,000,000
Interest Rate	7.50%
Minimum [Member] | Term loans, variable rate 1.88% to 2.13% due 2019 through 2021 and fixed rate 2.95% to 4.64% due 2017 through 2024
Debt Instrument [Line Items]
Interest Rate	1.88%
Minimum [Member] | Revenue bonds, 5.90% to 7.75%, due 2024 and 2026 [Member]
Debt Instrument [Line Items]
Interest Rate	5.90%
Maximum [Member] | Term loans, variable rate 1.88% to 2.13% due 2019 through 2021 and fixed rate 2.95% to 4.64% due 2017 through 2024
Debt Instrument [Line Items]
Interest Rate	2.13%
Maximum [Member] | Revenue bonds, 5.90% to 7.75%, due 2024 and 2026 [Member]
Debt Instrument [Line Items]
Interest Rate	6.95%
LIBOR [Member] | Minimum [Member] | Term loans, variable rate 1.88% to 2.13% due 2019 through 2021 and fixed rate 2.95% to 4.64% due 2017 through 2024
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.65%
LIBOR [Member] | Maximum [Member] | Term loans, variable rate 1.88% to 2.13% due 2019 through 2021 and fixed rate 2.95% to 4.64% due 2017 through 2024
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.90%
Debt Instrument, Redemption, Period One [Member] | Term loans, variable rate 1.88% to 2.13% due 2019 through 2021 and fixed rate 2.95% to 4.64% due 2017 through 2024
Debt Instrument [Line Items]
Interest Rate			2.95%
Debt Instrument, Redemption, Period Two [Member] | Term loans, variable rate 1.88% to 2.13% due 2019 through 2021 and fixed rate 2.95% to 4.64% due 2017 through 2024
Debt Instrument [Line Items]
Interest Rate			3.70%
Alabama and Mississippi [Member] | Term loans, variable rate 1.88% to 2.13% due 2019 through 2021 and fixed rate 2.95% to 4.64% due 2017 through 2024
Debt Instrument [Line Items]
Long-term Debt, Gross				$310,000,000	$310,000,000

Debt_Scheduled_Payments_Due_on

Debt (Scheduled Payments Due on Long-Term Debt) (Details) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Long-term Debt, Fiscal Year Maturity [Abstract]
2015	$22,500
2016	5,000
2017	11,000
2018	14,250
2019	$190,000

Accounts_Payable_and_Accrued_L2

Accounts Payable and Accrued Liabilites (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Accounts Payable and Accrued Liabilities [Abstract]
Wages, salaries and employee benefits	$14,667	$15,908
Trade accounts payable	5,656	7,702
Taxes other than income taxes	5,663	6,247
Interest	4,811	4,018
Logging related expenses	2,983	1,600
Deferred recreational lease income	1,616	880
Freight	740	802
Book overdrafts	4,385	2,920
Other	2,543	3,540
Accounts Payable and Accrued Liabilities, Total	$43,064	$43,617

Other_LongTerm_Obligations_Det

Other Long-Term Obligations (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Other Long-Term Obligations [Line Items]
Employee benefits and related liabilities	$8,839,000	$15,423,000
Cost share logging roads	5,894,000	5,759,000
Other	1,019,000	1,171,000
Other Long-Term Obligations, Total	15,752,000	22,353,000
Reclassification from employee benefits and related liabilities to stockholders' equity	$4,300,000

Financial_Instruments_and_Conc2

Financial Instruments and Concentration of Risk (Estimated Fair Values of Financial Instruments) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and short-term investments, Carrying Amount	$31,012	$57,837
Cash and short-term investments, Fair Value	31,012	57,837
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt (including current installments on lont-term debt and fair value adjustments related to fair value swaps), Carrying Amount	629,343	320,092
Long-term debt (including current installments on lont-term debt and fair value adjustments related to fair value swaps), Fair Value	657,943	347,869
Level 2 [Member] | Interest rate contracts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net derivative asset related to interest rate swaps, Carrying Amount	793	1,830
Net derivative asset related to interest rate swaps, Fair Value	793	1,830
Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Company owned life insurance (COLI)	877	3,110
Company owned life insurance (COLI), fair value	$877	$3,110

Financial_Instruments_and_Conc3

Financial Instruments and Concentration of Risk (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Derivatives, Fair Value [Line Items]
Debentures	$630,085,000	$320,085,000
Concentration Risk, Customer	1	1
Concentration Risk, Percentage	10.00%	10.00%
Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Number of interest rate swap agreements	7
Notional amounts	96,750,000
Debentures	22,500,000
Medium-term notes	24,250,000
Senior Notes	$50,000,000
Swaps fixed interest rate, minimum	6.95%
Swaps fixed interest rate, maximum	8.89%
LIBOR variable interest rate, minimum	4.74%
LIBOR variable interest rate, maximum	6.52%

Financial_Instruments_and_Conc4

Financial Instruments and Concentration of Risk (Fair Values of Derivative Instruments) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Derivatives, Fair Value [Line Items]
Fair Value of Derivative Assets	$421	$1,830
Derivatives designated as hedging instruments [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Derivative Assets	793	1,830
Other non-current assets [Member] | Derivatives designated as hedging instruments [Member] | Interest rate contracts [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Derivative Assets	$793	$1,830

Financial_Instruments_and_Conc5

Financial Instruments and Concentration of Risk (Effect Of Derivatives on the Consolidated Statement of Operations) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Derivatives designated as hedging instruments [Member] | Interest rate contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) recognized in income	$979		$960		$868
Derivatives designated as hedging instruments [Member] | Interest expense [Member] | Interest rate contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Realized gain (loss) on hedging instrument/derivative	979	[1]	960	[1]	868	[1]
Derivatives not designated as hedging instruments [Member] | Lumber contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) recognized in income	0		0		-876
Derivatives not designated as hedging instruments [Member] | Cost of goods sold [Member] | Lumber contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gain (loss) on derivative	0		0		-480
Realized gain (loss) on hedging instrument/derivative	$0		$0		($396)
[1]	1 Realized gain on hedging instrument consists of net cash settlements and interest accruals on the interest rate swaps during the period.

Savings_Plans_Pension_Plans_an2

Savings Plans, Pension Plans and Other Postretirement Employee Benefits (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2009
Defined Benefit Plan Disclosure [Line Items]
401(K) contributions by employer	$2,000,000	$1,800,000	$1,600,000
Pension Contributions	3,550,000	0	21,630,000
Accumulated benefit obligation	410,400,000	387,400,000
Non-Qualified Pension Plan, Estimated Payments in Next Fiscal Year	1,800,000
Health care cost trend rate assumed for next fiscal year	5.70%
Decrease in accumulated postretirement benefit obligations				-76,700,000
Defined Benefit Plan, Assumption Health Care Cost Trend Rate for Next Fiscal Year	4.30%
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	4.25%	5.10%	4.15%
Contributions	5,317,000	1,734,000
Estimated net loss to be amortized from Accumulated Other Comprehensive Loss ino Net Periodic Benefit Cost	17,600,000
Estimated prior service cost to be amortized from Accumulated Other Comprehensive Loss ino Net Periodic Benefit Cost	600,000
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	3.90%	4.45%	3.70%
Contributions	4,319,000	3,902,000
Estimated net loss to be amortized from Accumulated Other Comprehensive Loss ino Net Periodic Benefit Cost	2,200,000
Estimated prior service cost to be amortized from Accumulated Other Comprehensive Loss ino Net Periodic Benefit Cost	$9,300,000

Savings_Plans_Pension_Plans_an3

Savings Plans, Pension Plans and Other Postretirement Employee Benefits (Change in Benefit Obligation, Plan Assets and Funded Status for Company-Sponsored Benefit Plans and Obligations) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets	$337,059	$350,588
Amounts recognized in the consolidated balance sheets [Abstract]
Current Liabilities	6,260	6,701
Noncurrent Liabilities	115,936	83,619
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation	-393,565	-445,535
Service Cost	-5,081	-5,318	-5,238
Interest Cost	-19,184	-17,826	-19,986
Plan Amendments	0	0
Actuarial Loss (Gain)	-49,990	41,178
Benefits Paid	50,126	33,936
Benefit Obligation	-417,694	-393,565	-445,535
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets	350,588	345,633
Actual Return on Plan Assets	31,280	37,157
Employer contributions and benefit payments	5,317	1,734
Fair Value of Plan Assets	337,059	350,588	345,633
Amounts recognized in the consolidated balance sheets [Abstract]
Current Liabilities	-1,774	-1,772
Noncurrent Liabilities	-78,861	-41,205
Funded Status of Plan	-80,635	-42,977
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligation	-47,343	-52,033
Service Cost	-25	-94	-284
Interest Cost	-1,741	-1,810	-2,478
Plan Amendments	0	0
Actuarial Loss (Gain)	3,229	2,692
Benefits Paid	4,319	3,902
Benefit Obligation	-41,561	-47,343	-52,033
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets	0	0
Actual Return on Plan Assets	0	0
Employer contributions and benefit payments	4,319	3,902
Fair Value of Plan Assets	0	0	0
Amounts recognized in the consolidated balance sheets [Abstract]
Current Liabilities	-4,486	-4,929
Noncurrent Liabilities	-37,075	-42,414
Funded Status of Plan	($41,561)	($47,343)

Savings_Plans_Pension_Plans_an4

Savings Plans, Pension Plans and Other Postretirement Employee Benefits (Long-Term Asset Allocation Ranges) (Details)	12 Months Ended
	Dec. 31, 2014
Maximum [Member]
Domestic and International Equities	48.00%
Fixed income securities	58.00%
Alternatives	18.00%
Cash	5.00%
Minimum [Member]
Domestic and International Equities	24.00%
Fixed income securities	38.00%
Alternatives	12.00%
Cash	0.00%

Savings_Plans_Pension_Plans_an5

Savings Plans, Pension Plans and Other Postretirement Employee Benefits (Weighted Average Asset Alllocations of the Pension Benefit Plans' Assets) (Details) (Pension Plans, Defined Benefit [Member])	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan, Actual Plan Asset Allocations	100.00%	100.00%
Domestic Equity Securities [Member]
Defined Benefit Plan, Actual Plan Asset Allocations	14.00%	20.00%
Debt Securities [Member]
Defined Benefit Plan, Actual Plan Asset Allocations	48.00%	38.00%
Global and International Equity Securities [Member]
Defined Benefit Plan, Actual Plan Asset Allocations	22.00%	27.00%
Other notes [Member]
Defined Benefit Plan, Actual Plan Asset Allocations	16.00%	15.00%

Savings_Plans_Pension_Plans_an6

Savings Plans, Pension Plans and Other Postretirement Employee Benefits (Fair Value Measurements) (Details) (USD $)	Dec. 31, 2014		Dec. 31, 2013
In Thousands, unless otherwise specified
Fair Value of Plan Assets	$337,059		$350,588
Cash and Cash Equivalents [Member]
Cash and Equivalents	6,586		9,673
Equity Securities [Member]
U.S. Large Cap			32,304	[1]
U.S. Small Mid Cap	1,136	[2]	19,053	[2]
International Companies	13,782		34,773
Mutual Funds [Member]
Mutual Funds	226,710	[3]	185,505	[4]
Percent Invested in High-Quality Intermediate and Long-Term Investment Grade Securities	72.00%		50.00%
Percent Invested in Diversified Portfolio of Fixed-Income Instruments of Varying Maturities	22.00%		50.00%
Defined Benefit Plan, Fair Vale Measurements, Mutual Funds, Percent Invested in US Small/Mid Cap Equities that Track Russell 2500 Growth Index	6.00%
Investments [Member]
U.S. Large Cap			30,005	[5]
Developed Markets	29,879	[6]	17,401	[7]
Emerging Markets	28,961	[8]	41,300	[8]
Hedge Funds [Member]
Hedge Funds			10,579	[9]
Percent Invested in Long/Short and Event-Driven Equity			37.00%
Percent Invested in Long and Short Credit			24.00%
Percent in Relative Value			11.00%
Percent Invested in Distressed Debt			10.00%
Defined Benefit Plan, Fair Value Investments, Hedge Funds, Percent Invested in Convertible Bond Hedging			6.00%
Percent in Other Investments			13.00%
Level 1 [Member]
Cash and Equivalents	31,012		57,837
Fair Value of Plan Assets	248,214		281,308
Level 1 [Member] | Cash and Cash Equivalents [Member]
Cash and Equivalents	6,586		9,673
Level 1 [Member] | Equity Securities [Member]
U.S. Large Cap			32,304	[1]
U.S. Small Mid Cap	1,136	[2]	19,053	[2]
International Companies	13,782		34,773
Level 1 [Member] | Mutual Funds [Member]
Mutual Funds	226,710	[3]	185,505	[4]
Level 1 [Member] | Investments [Member]
U.S. Large Cap			0	[5]
Developed Markets	0	[6]	0	[7]
Emerging Markets	0	[8]	0	[8]
Level 1 [Member] | Hedge Funds [Member]
Hedge Funds			0	[9]
Level 2 [Member]
Fair Value of Plan Assets	88,845		58,701
Level 2 [Member] | Cash and Cash Equivalents [Member]
Cash and Equivalents	0		0
Level 2 [Member] | Equity Securities [Member]
U.S. Large Cap			0	[1]
U.S. Small Mid Cap	0	[2]	0	[2]
International Companies	0		0
Level 2 [Member] | Mutual Funds [Member]
Mutual Funds		[3]	0	[4]
Level 2 [Member] | Investments [Member]
U.S. Large Cap			30,005	[5]
Developed Markets	29,879	[6]	17,401	[7]
Emerging Markets	28,961	[8]	41,300	[8]
Level 2 [Member] | Hedge Funds [Member]
Hedge Funds			0	[9]
Level 3 [Member]
Fair Value of Plan Assets	0		10,579
Level 3 [Member] | Cash and Cash Equivalents [Member]
Cash and Equivalents	0		0
Level 3 [Member] | Equity Securities [Member]
U.S. Large Cap			0	[1]
U.S. Small Mid Cap	0	[2]	0	[2]
International Companies	0		0
Level 3 [Member] | Mutual Funds [Member]
Mutual Funds	0	[3]	0	[4]
Level 3 [Member] | Investments [Member]
U.S. Large Cap			0	[5]
Developed Markets	0	[6]	0	[7]
Emerging Markets	0	[8]	0	[8]
Level 3 [Member] | Hedge Funds [Member]
Hedge Funds			$10,579	[9]
[1]	These are managed investments in US large cap equities that track the Russell 1000 Value index.
[2]	These are managed investments in US small/mid cap equities that track the Russell 2500 Growth index.
[3]	The mutual funds were 72% invested in high-quality intermediate and long-term investment grade securities, 22% invested in a diversified portfolio of fixed-income instruments of varying maturities, which may be represented by forwards or derivatives such as options, futures contracts or swap agreements and debt securities, and 6% invested in US small/mid cap equities that track the Russell 2500 Growth index.
[4]	The mutual funds were 50% invested in high-quality intermediate and long-term investment grade securities and 50% invested in a diversified portfolio of fixed-income instruments of varying maturities, which may be represented by forwards or derivatives such as options, futures contracts or swap agreements and debt securities.
[5]	These collective investments are invested in US large cap equities that track the S&P 500.
[6]	These collective investments are invested in equity funds of developed markets outside of the US & Canada, that track the MSCI EAFE Value or MSCI EAFE Growth index.
[7]	These collective investments are invested in equity funds of developed markets outside of the US & Canada, that track the MSCI EAFE index.
[8]	These collective investments are invested in equity funds of emerging markets outside of the US & Canada, that track the MSCI Emerging Markets index.
[9]	The hedge funds are 37% invested in long/short and event-driven equity, 24% invested in long and short credit, 11% in relative value, 10% invested in distressed debt, 6% invested in convertible bond hedging, with the remaining 13% in other investments.

Savings_Plans_Pension_Plans_an7

Savings Plans, Pension Plans and Other Postretirement Employee Benefits (Summary of Changes in the Fair Value of the Plans' Level 3 Assest) (Details) (Hedge Funds [Member], USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Hedge Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Asset balance	$0	$10,579	$45,693
Sales and settlements	-10,579	-34,500
Unrealized gain (losses) relating to assets still held at the reporting date	$0	($614)

Savings_Plans_Pension_Plans_an8

Savings Plans, Pension Plans and Other Postretirement Employee Benefits (Pre-Tax Components Of Net Periodic Cost (Benefit)) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$5,081	$5,318	$5,238
Interest cost	19,184	17,826	19,986
Expected return on plan assets	-24,512	-26,092	-28,755
Curtailment credit	0	0	0
Amortization of prior service cost (credit)	748	779	770
Amortization of actuarial loss	14,451	19,929	15,356
Net periodic cost (benefit)	14,952	17,760	12,595
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	25	94	284
Interest cost	1,741	1,810	2,478
Expected return on plan assets	0	0	0
Curtailment credit	0	0	-103
Amortization of prior service cost (credit)	-9,641	-9,708	-9,343
Amortization of actuarial loss	2,186	3,209	3,127
Net periodic cost (benefit)	($5,689)	($4,595)	($3,557)

Savings_Plans_Pension_Plans_an9

Savings Plans, Pension Plans and Other Postretirement Employee Benefits Savings Plans, Pension Plans and Other Postretirement Employee Benefits (Other Amounts Recognized in Consolidated Statements of Comprehensive Income) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net amount at beginning of year	($98,720)
Taxes	-15,598	21,424	-5,968
Net amount arising during the period	-24,396	33,510	-9,334
Taxes	0	0	2,159
Net reclassifications during the period	19,672	-42,178	16
Net amount at end of year	-118,392	-98,720
Pension Plans, Defined Benefit [Member]
Net amount at beginning of year	117,167	161,667	158,883
Net loss (gain)	43,223	-52,242	20,180
Prior service cost (credit)	0	0	510
Taxes	-16,857	20,374	-8,069
Net amount arising during the period	26,366	-31,868	12,621
Amortization of prior service (cost) credit	-748	-779	-770
Amortization of actuarial loss	-14,451	-19,929	-15,356
Taxes	5,927	8,076	6,289
Net reclassifications during the period	-9,272	-12,632	-9,837
Net amount at end of year	134,261	117,167	161,667
Other Postretirement Benefit Plans, Defined Benefit [Member]
Net amount at beginning of year	-18,447	-20,769	-18,001
Net loss (gain)	-3,229	-2,692	-4,878
Prior service cost (credit)	0	0	-5,942
Taxes	1,259	1,050	4,260
Net amount arising during the period	-1,970	-1,642	-6,560
Amortization of prior service (cost) credit	9,641	9,708	9,343
Amortization of actuarial loss	-2,186	-3,209	-3,127
Taxes	-2,907	-2,535	-2,424
Net reclassifications during the period	4,548	3,964	3,792
Net amount at end of year	($15,869)	($18,447)	($20,769)

Recovered_Sheet1

Savings Plans, Pension Plans and Other Postretirement Employee Benefits Savings Plans, Pension Plans and Other Postretirement Employee Benefits (Amounts Recognized in AOCI on Consolidated Balance Sheet) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net amount recognized	($118,392)	($98,720)
Pension Plans, Defined Benefit [Member]
Net Loss	134,717	115,404
Prior Service Cost (Credit)	-456	1,763
Net amount recognized	134,261	117,167	161,667	158,883
Other Postretirement Benefit Plans, Defined Benefit [Member]
Net Loss	-21,750	16,490
Prior Service Cost (Credit)	5,881	-34,937
Net amount recognized	($15,869)	($18,447)	($20,769)	($18,001)

Recovered_Sheet2

Savings Plans, Pension Plans and Other Postretirement Employee Benefits (Schedule of Estimated Future Beneffit Payments) (Details) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Other Postretirement Benefit Plans, Defined Benefit [Member]
2015	$4,486
2016	4,293
2017	4,044
2018	3,789
2019	3,541
2020 through 2024	14,600
Pension Plans, Defined Benefit [Member]
2015	29,566
2016	29,342
2017	29,167
2018	29,049
2019	29,031
2020 through 2024	$143,681

Recovered_Sheet3

Savings Plans, Pension Plans and Other Postretirement Employee Benefits (Weighted Average Assumptions Used to Determine the Benefit Obligation) (Details)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Other Postretirement Benefit Plans, Defined Benefit [Member]
Discount Rate	3.90%	4.45%	3.70%
Rate of salaried compensation increase	0.00%	0.00%	0.00%
Pension Plans, Defined Benefit [Member]
Discount Rate	4.25%	5.10%	4.15%
Rate of salaried compensation increase	3.00%	3.00%	3.50%

Recovered_Sheet4

Savings Plans, Pension Plans and Other Postretirement Employee Benefits (Weighted Average Assumptions used to Determne the Net Periodic Benefit (Cost)) (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Other Postretirement Benefit Plans, Defined Benefit [Member]
Discount Rate	4.45%	3.70%	4.85%
Expected return on plan assets	0.00%	0.00%	0.00%
Rate of salaried compensation increase	0.00%	0.00%	0.00%
Pension Plans, Defined Benefit [Member]
Discount Rate	5.10%	4.15%	4.95%
Expected return on plan assets	7.50%	8.00%	8.00%
Rate of salaried compensation increase	3.00%	3.50%	3.50%

Recovered_Sheet5

Savings Plans, Pension Plans and Other Postretirement Employee Benefits (One Percent Point Change in Health Care Cost Trend Rate Effect) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014
Savings Plans, Pension Plans and Other Postretirement Employee Benefits [Abstract]
Effect on total service and interest cost components, 1% increase	$5
Effect on total service and interest cost components, 1% decrease	-5
Effect on OPEB obligations, 1% increase	112
Effect on OPEB obligations, 1% decrease	($112)

Commitments_and_Contingencies_1

Commitments and Contingencies (Future Minimum Rental Payments) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Commitments and Contingencies Disclosure [Abstract]
2015	$4,211,000
2016	3,148,000
2017	1,904,000
2018	1,123,000
2019	452,000
2020 and thereafter	1,355,000
Total	12,193,000
Rent Expense	$4,000,000	$3,600,000	$3,100,000

Commitments_and_Contingencies_2

Commitments and Contingencies (Environmental) (Details) (USD $)	3 Months Ended			12 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Site Contingency [Line Items]
Loss Contingency Accrual, Carrying Value, Payments	$1,000,000	$1,750,000	$750,000		$1,750,000
Accrual, Present Value				0	0	4,250,000
Environmental remediation charges				0	3,522,000	0
Cash Payments				$0	($7,772,000)

EquityBased_Compensation_Plans2

Equity-Based Compensation Plans (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outandsing Stock Options, Date Fully Exercisable After	2 years 0 months 0 days
Outstanding Stock Options, Number of Years Expiration Date is No Later Than	10 years 0 months 0 days
Proceeds from Issuance of Common Stock	$398,000	$1,904,000	$1,075,000
Performance shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	4,100,000
Weighted average period (in years)	1 year 7 months 6 days
Restricted stock units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	800,000
Weighted average period (in years)	1 year 6 months 0 days
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proceeds from Issuance of Common Stock	$400,000	$1,900,000	$1,100,000
Minimum [Member] | Performance shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares Actually Issued, as a Percent of the Amount Subject to the Performance Share Award	0.00%
Maximum [Member] | Performance shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares Actually Issued, as a Percent of the Amount Subject to the Performance Share Award	200.00%
2005 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number Of Shares Originally Authorized	1,600,000
Number of Shares Authorized	1,100,000
2014 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number Of Shares Originally Authorized	1,000,000
Number of Shares Authorized	1,100,000
Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred Stock, Shares Outstanding	122,782

EquityBased_Compensation_Plans3

Equity-Based Compensation Plans (Details Of Compensation Expense) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee equity-based compensation expense	$4,137	$4,377	$4,067
Director deferred compensation expense (income)	345	1,265	2,008
Actual tax benefit realized for tax deductions from equity-based plans	280	71	525
Performance shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee equity-based compensation expense	3,515	3,635	3,440
Restricted stock units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee equity-based compensation expense	$622	$742	$627

EquityBased_Compensation_Plans4

Equity-Based Compensation Plans (Fair Value Of Performance Share Awards) (Details) (Performance shares [Member], USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Performance shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (in shares)	87,441	83,111	85,028
Stock price as of valuation date (in dollars per share)	$39.76	$45.31	$31.11
Risk-free rate	0.72%	0.40%	0.40%
Fair value of a performance share (in dollars per share)	$45.57	$62.78	$34.24

EquityBased_Compensation_Plans5

Equity-Based Compensation Plans (Summary Of Outstanding Performance Share Awards / Restricted Stock Units) (Details) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Performance shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Unvested shares outstanding at January 1, Shares	155,814	160,214	154,594
Granted (in shares)	87,441	83,111	85,028
Vested (in shares)	-76,202	-71,861	-76,812
Forfeited (in shares)	-6,820	-15,650	-2,596
Unvested shares outstanding at December 31, Shares	160,233	155,814	160,214
Unvested shares outstanding at January 1, Weighted Avg. Grant Date Fair Value (in dollars per share)	$48.73	$44.50	$50.54
Granted, Weighted Av.g Exercise Price (in dollars per share)	$45.57	$62.78	$34.24
Vested, Weighted Avg. Grant Date Fair Value (in dollars per share)	$34.24	$55.84	$45.30
Forfeited, Weighted Avg. Grant Date Fair Value (in dollars per share)	$49.75	$47.32	$44.99
Unvested shares outstanding at December 31, Weighted Avg. Grant Date Fair Value (in dollars per share)	$53.86	$48.73	$44.50
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value	$2,609	$4,013	$3,480
Aggregate Intrinsic Value	6,709	6,504	6,019
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Unvested shares outstanding at January 1, Shares	37,461	40,219	36,359
Granted (in shares)	19,599	23,449	20,225
Vested (in shares)	-21,333	-19,796	-14,861
Forfeited (in shares)	-3,272	-6,411	-1,504
Unvested shares outstanding at December 31, Shares	32,455	37,461	40,219
Unvested shares outstanding at January 1, Weighted Avg. Grant Date Fair Value (in dollars per share)	$38.69	$34.82	$35.60
Granted, Weighted Av.g Exercise Price (in dollars per share)	$40.51	$44.41	$31.53
Vested, Weighted Avg. Grant Date Fair Value (in dollars per share)	$34.46	$38.19	$32.41
Forfeited, Weighted Avg. Grant Date Fair Value (in dollars per share)	$42.06	$36.91	$33.36
Unvested shares outstanding at December 31, Weighted Avg. Grant Date Fair Value (in dollars per share)	$42.24	$38.69	$34.82
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value	735	756	482
Aggregate Intrinsic Value	$1,359	$2,511	$1,575

EquityBased_Compensation_Plans6

Equity-Based Compensation Plans (Summary Of Outstanding Stock Options) (Details) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at January 1, (in shares)	12,859	83,827	144,684
Shares exercised	-12,859	-70,968	-60,857
Outstanding and exercisable at December 31, (in shares)	0	12,859	83,827
Outstanding at January 1, Weighted Avg. Exercise Price (in dollars per share)	$30.92	$27.46	$23.34
Shares exercised, Weighted Avg. Exercise Price (in dollars per share)	$30.92	$26.25	$17.66
Outstanding and exercisable at December 31, Weighted Avg. Exercise Price (in dollars per share)		$30.92	$27.46
Shares exercised, Aggregate Intrinsic Value	$150	$1,423	$938

Segment_Information_Summary_Of

Segment Information (Summary Of Information By Business Segment) (Details) (USD $)	3 Months Ended										12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013		Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Segment Reporting Information [Line Items]
Number of Reportable Segments											3
Segment Revenues	$146,237		$177,215	$143,919	$139,579	$139,955		$157,869	$133,212	$139,253	$606,950		$570,289		$525,134
Operating Income											109,597		84,466		59,403
Operating Income	26,603		44,869	29,725	31,309	20,645		30,904	29,441	26,608	132,506		107,598		84,942
Interest expense, net											-22,909		-23,132		-25,539
Depreciation, depletion and amortization											26,749		26,962		26,247
Basis of real estate sold											8,646		2,904		5,048
Assets	1,035,421					680,530					1,035,421		680,530		718,897
Capital Expenditures											24,232	[1]	22,593	[1]	17,410	[1]
Operating Segments [Member]
Segment Reporting Information [Line Items]
Segment Revenues											669,280		630,403		575,488
Operating Income											164,173		149,676		121,994
Depreciation, depletion and amortization											24,082		24,353		23,020
Assets	966,547					592,292					966,547		592,292		577,461
Capital Expenditures											23,667	[1]	21,462	[1]	16,565	[1]
Resource [Member]
Segment Reporting Information [Line Items]
Segment Revenues											252,581		238,228		207,846
Operating Income											84,976		73,425		49,543
Depreciation, depletion and amortization											17,847		18,103		16,446
Real Estate [Member]
Segment Reporting Information [Line Items]
Segment Revenues											40,460		26,160		38,238
Operating Income											26,945		18,266		28,056
Depreciation, depletion and amortization											59		56		36
Basis of real estate sold											9,355		3,536		5,413
Resource and Real Estate [Member]
Segment Reporting Information [Line Items]
Assets	847,873	[2]				476,628	[2]				847,873	[2]	476,628	[2]	477,271	[2]
Capital Expenditures											11,116	[1]	12,449	[1]	12,138	[1]
Wood Products [Member]
Segment Reporting Information [Line Items]
Segment Revenues											376,239		366,015		329,404
Operating Income											52,442		58,892		45,456
Depreciation, depletion and amortization											6,176		6,194		6,538
Assets	118,674					115,664					118,674		115,664		100,190
Capital Expenditures											12,551	[1]	9,013	[1]	4,427	[1]
Eliminations and Adjustments [Member]
Segment Reporting Information [Line Items]
Segment Revenues											-62,330	[3]	-60,114	[3]	-50,354	[3]
Operating Income											-190		-907		-1,061
Basis of real estate sold											-709		-632		-365
Corporate Elimination [Member]
Segment Reporting Information [Line Items]
Operating Income											-31,667		-42,078		-37,052
Depreciation, depletion and amortization											2,667		2,609		3,227
Assets	68,874					88,238					68,874		88,238		141,436
Capital Expenditures											$565	[1]	$1,131	[1]	$845	[1]
[1]	Excludes acquisition of timber and timberlands.
[2]	Assets are shown on a combined basis for the Resource and Real Estate segments, as we do not produce information separately for those segments for internal purposes.
[3]	ntersegment revenues for 2012-2014, which were based on prevailing market prices, consisted of logs sold by our Resource segment to the Wood Products segment.

Segment_Information_Segment_In

Segment Information Segment Information (Schedule of Revenue by Geographic Area) (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues	$146,237	$177,215	$143,919	$139,579	$139,955	$157,869	$133,212	$139,253	$606,950	$570,289	$525,134
United States
Revenues									601,738	558,138	516,466
Canada
Revenues									2,618	9,645	5,180
Mexico
Revenues									$2,594	$2,506	$3,488

Financial_Results_by_Quarter_F

Financial Results by Quarter Financial Results by Quarter (Details) (USD $)	3 Months Ended																12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Data [Abstract]
Revenues	$146,237		$177,215		$143,919		$139,579		$139,955		$157,869		$133,212		$139,253		$606,950	$570,289	$525,134
Operating Income	26,603		44,869		29,725		31,309		20,645		30,904		29,441		26,608		132,506	107,598	84,942
Net income (loss)	$20,136		$33,154		$16,270		$20,350		$13,721		$22,191		$19,182		$15,487		$89,910	$70,581	$42,594
Basic (in dollars per share)	$0.49	[1]	$0.81	[1]	$0.40	[1]	$0.50	[1]	$0.34	[1]	$0.55	[1]	$0.47	[1]	$0.38	[1]	$2.21	$1.74	$1.06
Diluted (in dollars per share)	$0.49	[1]	$0.81	[1]	$0.40	[1]	$0.50	[1]	$0.34	[1]	$0.54	[1]	$0.47	[1]	$0.38	[1]	$2.20	$1.73	$1.05
[1]	1 Per-share amounts are computed independently for each of the quarters presented. Therefore, the sum of the quarterly per-share amounts may not equal the total computed for the year.