Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Statement [Abstract]
Revenues	$ 599,099	$ 575,336	$ 606,950
Costs and expenses:
Cost of goods sold	462,304	470,037	429,789
Selling, general and administrative expenses	52,719	46,392	44,655
Loss on sale of central Idaho timber and timberlands	48,522
Total costs and expenses	563,545	516,429	474,444
Operating income	35,554	58,907	132,506
Interest expense, net	(28,941)	(32,761)	(22,909)
Income before income taxes	6,613	26,146	109,597
Income tax benefit (provision)	4,325	5,568	(19,687)
Net income	$ 10,938	$ 31,714	$ 89,910
Net income per share:
Basic (in dollars per share)	$ 0.27	$ 0.78	$ 2.21
Diluted (in dollars per share)	0.27	0.77	2.20
Distributions per share (in dollars per share)	$ 1.50	$ 1.50	$ 1.425
Weighted-average shares outstanding (in thousands)
Basic (in shares)	40,797,806	40,842,126	40,748,924
Diluted (in shares)	41,033,440	40,987,819	40,894,382