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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Cash flows from operating activities:    
Net income $ 2,116 $ 12,016
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 4,995 5,667
Amortization of debt costs 180 296
Provision for doubtful accounts 3,227 3,154
Deferred income taxes (744) (828)
Share-based compensation 1,943 1,480
Provision for inventory obsolescence 896 649
Excess income tax benefit on employee stock-based awards (78) (242)
Income tax benefit on employee stock-based awards 563 1,013
Other (345) 1,117
Change in operating assets and liabilities:    
Trade accounts receivable 13,779 (11,943)
Inventories (5,126) 732
Escrow receivable   41,537
Prepaid expenses and other current assets (179) 6,559
Trade accounts payable (7,242) (3,103)
Other current liabilities 4,478 (4,787)
Long-term assets (2,266) (1,405)
Long-term liabilities (743) (2,798)
Net cash provided by operating activities 15,454 49,114
Cash flows from investing activities:    
Capital expenditures for property, plant and equipment (6,029) (6,372)
Capital expenditures for intangible assets (439) (151)
Net cash used in investing activities (6,468) (6,523)
Cash flows from financing activities:    
Net proceeds from issuance of common shares 2,143 6,641
Repayments of long-term debt   (3,750)
(Repayment of) proceeds from bank borrowings, net (15) 69
Changes in restricted cash (8,141) (32,271)
Excess income tax benefit on employee stock-based awards 78 242
Net cash used in financing activities (5,935) (29,069)
Effect of exchange rate changes on cash (431) 324
Net increase in cash and cash equivalents 2,620 13,846
Cash and cash equivalents at the beginning of the period 31,055 33,207
Cash and cash equivalents at the end of the period $ 33,675 $ 47,053