Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Operating activities
Net income (loss)	$ (1,683)	$ 5,889
Adjustments to reconcile to net cash provided by operations:
Depreciation, depletion and amortization	39,511	34,967
Amortization of debt issue costs and original issue discount	580	578
Pension expense, net of unfunded benefits paid	2,788	2,512
Deferred income tax benefit (provision)	(12,268)	1,824
Gains on dispositions of plant, equipment and timberlands, net	(2,133)	(26)
Share-based compensation	3,830	2,956
Change in operating assets and liabilities
Accounts receivable	(16,606)	(12,511)
Inventories	(23,352)	(4,750)
Prepaid and other current assets	(506)	(1,711)
Accounts payable	14,679	7,044
Accruals and other current liabilities	(3,799)	(6,399)
Other	(1,003)	(1,609)
Net cash provided by operating activities	38	28,764
Investing activities
Expenditures for purchases of plant, equipment and timberlands	(36,944)	(71,047)
Proceeds from disposals of plant, equipment and timberlands, net	2,384	83
Other	(68)
Net cash used by investing activities	(34,628)	(70,964)
Financing activities
Net borrowings under revolving credit facility	46,660	68,236
Repayment of term loans	(5,647)	(4,528)
Payments of dividends	(11,368)	(11,130)
Proceeds from government grants	125
Payments related to share-based compensation awards and other	(980)	(112)
Net cash provided by financing activities	28,790	52,466
Effect of exchange rate changes on cash	(3,230)	3,732
Net increase (decrease) in cash and cash equivalents	(9,030)	13,998
Cash and cash equivalents at the beginning of period	116,219	55,444
Cash and cash equivalents at the end of period	107,189	69,442
Cash paid for:
Interest, net of amounts capitalized	10,349	7,810
Income taxes, net	$ 6,804	$ 4,193