Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Operating activities
Net income	$ 11,603	$ 16,168
Adjustments to reconcile to net cash provided by operations:
Depreciation, depletion and amortization	17,282	16,646
Amortization of debt issue costs	289	290
Pension expense, net of unfunded benefits paid	928	767
Deferred income tax benefit	1,704	2,436
Losses on dispositions of plant, equipment and timberlands, net	32	24
Share-based compensation	1,648	1,217
Change in operating assets and liabilities
Accounts receivable	(11,462)	2,376
Inventories	(9,907)	(5,888)
Prepaid and other current assets	1,670	(1,980)
Accounts payable	2,903	(15,759)
Accruals and other current liabilities	(8,874)	(4,897)
Other	(255)	41
Net cash provided by operating activities	7,561	11,441
Investing activities
Expenditures for purchases of plant, equipment and timberlands	(36,783)	(43,294)
Proceeds from disposals of plant, equipment and timberlands, net		33
Other		(300)
Net cash used by investing activities	(36,783)	(43,561)
Financing activities
Net borrowings under revolving credit facility	38,236
Payments of borrowing costs		(51)
Repayment of term loans	(2,190)	(1,926)
Payments of dividends	(5,455)	(5,231)
Proceeds from government grants		3,861
Payments related to share-based compensation awards and other	(112)	(751)
Net cash provided (used) by financing activities	30,479	(4,098)
Effect of exchange rate changes on cash	526	1,176
Net increase (decrease) in cash and cash equivalents	1,783	(35,042)
Cash and cash equivalents at the beginning of period	55,444	105,304
Cash and cash equivalents at the end of period	57,227	70,262
Cash paid for:
Interest, net of amounts capitalized	293	474
Income taxes, net	$ 2,194	$ 5,188