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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Cash flows from operating activities:    
Net income (loss) $ (5,128) $ 19,389
Adjustments to reconcile net income to net cash provided by (used for) operating activities:    
Depreciation and amortization 23,275 19,984
Amortization of debt premium 0 (218)
Deferred income tax provision (4,912) 37
Convertible debt conversion charge 0 7,273
Stock-based compensation 877 963
Excess tax benefit from stock options exercised 2 29
Issuance of treasury stock under 401(k) plan 160 154
(Increase) decrease in assets:    
Accounts receivable (61,482) (34,978)
Inventories (7,009) (16,310)
Prepaid and other current assets 28,601 (870)
Other assets (4,856) 1,330
Increase (decrease) in liabilities:    
Accounts payable 34,038 33,902
Other current liabilities 16,141 (4,266)
Other liabilities (1,716) (5,139)
Net cash provided by operating activities 17,991 21,280
Cash flows from investing activities:    
Capital expenditures (16,754) (21,174)
Acquisition of additional interest (12,676) 0
Decrease in Restricted Cash 14,188 0
Other 3,278 (219)
Net cash used for investing activities (11,964) (21,393)
Cash flows from financing activities:    
Proceeds from borrowings 0 345,313
Payment on debt (4,248) (18,059)
Term loan borrowing 6,945 10,818
Convertible note conversion 0 (14,090)
Proceeds from exercise of stock options 20 739
Excess tax benefit from stock options exercised (2) (29)
Payment of financing fees (33) (5,064)
Dividends paid (268) (243)
Net cash provided by (used for) financing activities 2,414 319,385
Effect of exchange rate changes on cash 2,293 61
Net increase in cash and cash equivalents 10,734 319,333
Cash and cash equivalents, beginning of period 189,360 189,114
Cash and cash equivalents, end of period 200,094 508,447
Supplemental Cash Flow Information [Abstract]    
Interest paid 2,553 15,535
Income taxes paid 4,508 10,003
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]    
Issuance of common stock for convertible debt payment $ 0 $ 45,903