Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating activities
Net income	$ 21,554	$ 64,575	$ 69,246
Adjustments to reconcile to net cash provided by operations:
Depreciation, depletion and amortization	65,826	63,236	70,555
Amortization of debt issue costs and original issue discount	1,153	1,184	1,315
Pension expense, net of unfunded benefits paid	11,180	7,383	5,173
Charge for impairment of intangible asset		1,200	3,262
Deferred income tax benefit	(22,055)	(1,902)	(9,419)
Losses (gains) on dispositions of plant, equipment and timberlands, net	216	(21,113)	(4,861)
Share-based compensation	5,889	7,244	7,859
Change in operating assets and liabilities
Accounts receivable	8,372	(13,312)	(5,404)
Inventories	(10,778)	(8,054)	(21,456)
Prepaid and other current assets	(2,430)	5,506	(3,521)
Accounts payable	(8,174)	26,042	(4,175)
Accruals and other current liabilities	43,195	(2,186)	(12,802)
Other	2,162	3,940	3,805
Net cash provided by operating activities	116,110	133,743	99,577
Investing activities
Expenditures for purchases of plant, equipment and timberlands	(160,158)	(99,889)	(66,046)
Proceeds from disposals of plant, equipment and timberlands, net	70	24,459	5,072
Acquisition, net of cash acquired		(224)	(8,015)
Other	(800)	(1,600)	(600)
Net cash used by investing activities	(160,888)	(77,254)	(69,589)
Financing activities
Net borrowings under (repayments of) revolving credit facility	2,891	(22,294)	(30,720)
Payments of borrowing costs	(136)	(1,329)
Proceeds from term loans	19,428	2,873	12,592
Repayment of term loans	(8,205)	(5,229)
Repurchases of common stock			(12,180)
Payments of dividends	(21,589)	(20,443)	(18,696)
Proceeds from government grants	5,582	421
Payments related to share-based compensation awards and other	(990)	(2,015)	(1,877)
Net cash used by financing activities	(3,019)	(48,016)	(50,881)
Effect of exchange rate changes on cash	(2,063)	(3,006)	(2,152)
Net increase (decrease) in cash and cash equivalents	(49,860)	5,467	(23,045)
Cash and cash equivalents at the beginning of period	105,304	99,837	122,882
Cash and cash equivalents at the end of period	55,444	105,304	99,837
Cash paid for:
Interest, net of amounts capitalized	14,569	16,256	17,643
Income taxes, net	$ 14,020	$ 15,849	$ 24,139