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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 $ 4,500 $ 9,407
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 5,029 5,717
Amortization of debt costs 180 296
Provision for doubtful accounts 1,374 3,222
Deferred income taxes (6) (2,652)
Share-based compensation 1,943 1,433
Excess income tax benefit on employee stock-based awards (78)  
Income tax benefit on employee stock-based awards 563 (389)
Other 391 (1,776)
Change in operating assets and liabilities:    
Trade accounts receivable 8,589 (5,423)
Inventories (2,100) (1,510)
Escrow receivable   41,537
Prepaid expenses and other current assets 2,695 8,711
Trade accounts payable (7,247) (4,041)
Other current liabilities 2,070 (5,544)
Long-term assets (1,805) (21)
Long-term liabilities (1,039)  
Net cash provided by operating activities 15,059 48,967
Cash flows from investing activities:    
Capital expenditures for property, plant and equipment (6,029) (6,372)
Capital expenditures for intangible assets (44) (151)
Net cash used in investing activities (6,073) (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 78 389
Net cash used in financing activities (5,935) (28,922)
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 [1] $ 47,053
[1] Unaudited