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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Cash flows from operating activities:    
Net income $ 79,719 $ 22,520
Adjustments to reconcile net income to net cash provided by (used for) operating activities:    
Depreciation and amortization 23,553 21,146
Deferred income tax provision 572 8,446
Noncash convertible debt conversion charge 0 16,135
Supply agreement termination income (26,134) 0
Stock-based compensation 2,175 1,384
Excess tax benefit from stock options exercised (190) 0
Issuance of treasury stock under 401(k) plan 293 268
Gain on acquisition 0 (919)
Increase in assets:    
Accounts receivable (51,659) (152,495)
Inventories (26,335) (34,968)
Prepaid and other current assets (11,305) (6,088)
Other assets 2,342 (222)
Increase (decrease) in liabilities:    
Accounts payable 37,346 77,736
Other current liabilities (259) 19,269
Other liabilities 18,565 (2,844)
Net cash provided by (used for) operating activities 48,683 (30,632)
Cash flows from investing activities:    
Capital expenditures (19,006) (10,196)
Acquisitions, net of cash acquired 0 (99,118)
Other 453 1,395
Net cash used for investing activities (18,553) (107,919)
Cash flows from financing activities:    
Repurchase of senior unsecured notes 0 (1,064)
Payment on debt (14,226) 0
Term loan borrowing 4,378 14,148
Proceeds from exercise of stock options 887 477
Excess tax benefit from stock options exercised 190 0
Dividends paid (423) (387)
Net cash provided by (used for) financing activities (9,194) 13,174
Effect of exchange rate changes on cash (656) 39
Net increase (decrease) in cash and cash equivalents 20,280 (125,338)
Cash and cash equivalents, beginning of period 129,170 239,500
Cash and cash equivalents, end of period $ 149,450 $ 114,162