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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Operating activities    
Net income $ 16,168 $ 13,925
Adjustments to reconcile to net cash provided by operations:    
Depreciation, depletion and amortization 16,646 15,975
Amortization of debt issue costs 290 315
Pension expense, net of unfunded benefits paid 767 2,463
Deferred income tax benefit 2,436 1,086
Losses (gains) on dispositions of plant, equipment and timberlands, net 24 (2,654)
Share-based compensation 1,217 1,747
Change in operating assets and liabilities    
Accounts receivable 2,376 (13,968)
Inventories (5,888) (4,732)
Prepaid and other current assets (1,980) (2,269)
Accounts payable (15,759) (8,067)
Accruals and other current liabilities (4,897) (3,492)
Other 41 1,826
Net cash provided by operating activities 11,441 2,155
Investing activities    
Expenditures for purchases of plant, equipment and timberlands (43,294) (21,749)
Proceeds from disposals of plant, equipment and timberlands, net 33 2,726
Other (300) (1,600)
Net cash used by investing activities (43,561) (20,623)
Financing activities    
Payments of borrowing costs (51) (1,008)
Repayment of term loans (1,926)  
Payments of dividends (5,231) (4,774)
Proceeds from government grants 3,861  
Payments related to share-based compensation awards and other (751) (1,408)
Net cash used by financing activities (4,098) (7,190)
Effect of exchange rate changes on cash 1,176 (2,609)
Net decrease in cash and cash equivalents (35,042) (28,267)
Cash and cash equivalents at the beginning of period 105,304 99,837
Cash and cash equivalents at the end of period 70,262 71,570
Cash paid for:    
Interest, net of amounts capitalized 474 818
Income taxes, net $ 5,188 $ 5,321