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Income Taxes - Unrecognized Tax Benefits (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Unrecognized tax benefits, beginning of period $ 7,156 $ 20,150 $ 18,367
Increases for tax positions taken in current period 542 4,461 2,648
Increases for tax positions taken in prior periods 10,502 663 846
Decreases for tax positions taken in prior periods (1,723) 0 (383)
Decreases for lapses in statutes of limitations (436) (1,548) (398)
Decreases for settlements with taxing authorities 0 (16,570) (930)
Unrecognized tax benefits, end of period 16,041 7,156 20,150
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued [Abstract]      
Benefit for lapses of statutes of limitations and settlement with taxing authorities (124) (1,583) (433)
Accruals for current and prior periods 293 626 944
Total interest and penalties $ 169 $ (957) $ 511
United States [Member]
     
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued [Abstract]      
Open tax years by major tax jurisdiction 2007 and forward    
The Netherlands [Member]
     
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued [Abstract]      
Open tax years by major tax jurisdiction 2006 and forward    
Czech Republic [Member]
     
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued [Abstract]      
Open tax years by major tax jurisdiction 2009 and forward