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Consolidated Statements of Cash Flow (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Operating Activities    
Net income $ 36,652 $ 32,070
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation and amortization 11,972 11,631
Deferred income taxes 7,553 2,937
Excess tax benefits of options exercised (24) (114)
Stock-based compensation 500 515
Other (146) (77)
Changes in operating assets and liabilities:    
Accounts receivable 14,903 (14,441)
Inventories (19,583) (9,693)
Trade accounts payable and accrued liabilities (12,283) 3,598
Other assets and liabilities (56) (697)
Current income taxes receivable / payable 3,096 3,564
Net cash provided by (used in) operating activities 42,584 29,293
Investing Activities    
Purchases of property, plant and equipment (34,897) (26,624)
Proceeds from sale of assets 52 75
Other 0 (32)
Net cash provided by (used in) investing activities (34,845) (26,581)
Financing Activities    
Purchase of treasury stock (2,922) 0
Proceeds from issuance of common stock, net 555 483
Dividends paid (1,243) (1,243)
Excess tax benefits of options exercised 24 114
Net cash provided by (used in) financing activities (3,586) (646)
Net increase (decrease) in cash and cash equivalents 4,153 2,066
Cash and cash equivalents at beginning of period 54,664 36,778
Cash and cash equivalents at end of period $ 58,817 $ 38,844