Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	$ 74,865	$ (3,435)
Adjustments to reconcile net income (loss) to net cash from operating activities:
Depreciation, depletion and amortization	21,908	25,723
Basis of real estate sold	6,351	6,686
Change in deferred taxes	(925)	1,375
Pension and other postretirement employee benefits	9,863	11,743
Equity-based compensation expense	3,536	3,290
Loss on sale of central Idaho timber and timberlands		48,522
Other, net	(1,467)	(1,141)
Funding of qualified pension plans	(5,275)	(1,300)
Change in working capital and operating-related activities, net	20,489	(17,073)
Net cash from operating activities	129,345	74,390
CASH FLOWS FROM INVESTING ACTIVITIES
Purchase of property, plant and equipment	(9,445)	(4,262)
Timberlands reforestation and roads	(11,577)	(10,421)
Acquisition of timber and timberlands	(22,033)	(1,180)
Net proceeds from sale of central Idaho timber and timberlands		111,460
Other, net	(106)	525
Net cash from investing activities	(43,161)	96,122
CASH FLOWS FROM FINANCING ACTIVITIES
Dividends to common stockholders	(45,686)	(45,647)
Repayment of revolving line of credit borrowings		(30,000)
Repayment of long-term debt	(5,000)	(113,335)
Proceeds from issuance of long-term debt		93,235
Repurchase of common stock		(5,956)
Other, net	(1,279)	(3,879)
Net cash from financing activities	(51,965)	(105,582)
Change in cash and cash equivalents	34,219	64,930
Cash and cash equivalents at beginning of period	82,584	7,925
Cash and cash equivalents at end of period	116,803	72,855
Cash paid (received) during the period for:
Interest, net of amounts capitalized	17,381	19,690
Income taxes, net	$ 13,923	$ (1,828)