Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Operating activities
Net income	$ 5,889	$ 18,133
Adjustments to reconcile to net cash provided by operations:
Depreciation, depletion and amortization	34,967	33,411
Amortization of debt issue costs	578	574
Pension expense, net of unfunded benefits paid	2,512	1,964
Deferred income tax benefit	1,824	(2,672)
(Gains) losses on dispositions of plant, equipment and timberlands, net	(26)	26
Share-based compensation	2,956	2,803
Change in operating assets and liabilities
Accounts receivable	(12,511)	(8,471)
Inventories	(4,750)	(12,295)
Prepaid and other current assets	(1,711)	(163)
Accounts payable	7,044	(3,027)
Accruals and other current liabilities	(6,399)	5,252
Other	(1,609)	1,105
Net cash provided by operating activities	28,764	36,640
Investing activities
Expenditures for purchases of plant, equipment and timberlands	(71,047)	(80,391)
Proceeds from disposals of plant, equipment and timberlands, net	83	53
Other		(300)
Net cash used by investing activities	(70,964)	(80,638)
Financing activities
Net borrowings (repayments) under revolving credit facility	68,236	(11,403)
Payments of borrowing costs		(136)
Proceeds from term loans		19,428
Repayment of term loans	(4,528)	(3,803)
Payments of dividends	(11,130)	(10,679)
Proceeds from government grants		4,443
Payments related to share-based compensation awards and other	(112)	(976)
Net cash provided (used) by financing activities	52,466	(3,126)
Effect of exchange rate changes on cash	3,732	352
Net increase (decrease) in cash and cash equivalents	13,998	(46,772)
Cash and cash equivalents at the beginning of period	55,444	105,304
Cash and cash equivalents at the end of period	69,442	58,532
Cash paid for:
Interest, net of amounts capitalized	7,810	7,509
Income taxes, net	$ 4,193	$ 8,486