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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Operating Activities    
Net income $ 22,141 $ 21,007
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation and amortization 7,848 7,813
Deferred income taxes 2,474 4,237
Excess tax benefits of options exercised (24) (106)
Stock-based compensation 516 234
Other (22) (87)
Changes in operating assets and liabilities:    
Accounts receivable 6,602 (22,883)
Inventories (14,311) (9,402)
Trade accounts payable and accrued liabilities (15,003) (3,867)
Other assets and liabilities (136) (584)
Current income taxes receivable / payable 3,704 383
Net cash provided by (used in) operating activities 13,789 (3,255)
Investing Activities    
Purchases of property, plant and equipment (22,497) (14,178)
Proceeds from sale of assets 0 75
Other 0 (32)
Net cash provided by (used in) investing activities (22,497) (14,135)
Financing Activities    
Proceeds from issuance of common stock, net 452 428
Dividends paid (829) (828)
Excess tax benefits of options exercised 24 106
Net cash provided by (used in) financing activities (353) (294)
Net increase (decrease) in cash and cash equivalents (9,061) (17,684)
Cash and cash equivalents at beginning of period 54,664 36,778
Cash and cash equivalents at end of period $ 45,603 $ 19,094