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Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
OPERATING ACTIVITIES    
Net income $ 6,395 $ 6,694
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation and amortization 3,352 3,609
Deferred income taxes (506) (6,099)
Other 89 255
Changes in operating assets and liabilities:    
Accounts receivable (14,810) (28,451)
Inventories 9,288 6,110
Trade accounts payable and accrued liabilities (3,743) (6,682)
Other assets and liabilities 3,862 (1,696)
Current income taxes receivable / payable (2,146) 7,414
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES 1,781 (18,846)
INVESTING ACTIVITIES    
Purchases of property, plant and equipment (2,588) (9,118)
Proceeds from sale of assets   10
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES (2,588) (9,108)
FINANCING ACTIVITIES    
Proceeds from issuances of common stock 70 43
Dividends paid (413) (469)
Excess tax benefits of options exercised 11 5
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES (332) (421)
Net increase (decrease) in cash and cash equivalents (1,139) (28,375)
Cash and cash equivalents at beginning of period 33,883 [1] 112,298
Cash and cash equivalents at end of period $ 32,744 $ 83,923
[1] The consolidated balance sheet at December 31, 2012, as presented, is derived from the audited consolidated financial statements at that date.