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Comprehensive income (loss) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Components of and changes in accumulated other comprehensive income        
Balance at beginning of the period     $ 1,761  
Unrealized gain on cross-currency swap, net of tax (585) 199 (76) 1,301
Foreign currency translation adjustment (3,798) 1,636 (1,597) 3,624
Balance at end of the period 88   88  
Unrealized gain on derivative instrument, taxes     (44)  
Comprehensive income (loss)        
Net income (loss) 11,205 9,958 23,221 (25,843)
Other comprehensive income (loss):        
Unrealized gain on cross-currency swap, net of tax (585) 199 (76) 1,301
Foreign currency translation adjustment (3,798) 1,636 (1,597) 3,624
Total comprehensive income (loss) 6,822 11,793 21,548 (20,918)
Foreign Currency Translation Adjustments
        
Components of and changes in accumulated other comprehensive income        
Balance at beginning of the period     1,893  
Foreign currency translation adjustment     (1,597)  
Balance at end of the period 296   296  
Other comprehensive income (loss):        
Foreign currency translation adjustment     (1,597)  
Fair Value of Cross-Currency Swap
        
Components of and changes in accumulated other comprehensive income        
Balance at beginning of the period     (132)  
Unrealized gain on cross-currency swap, net of tax     (76)  
Balance at end of the period (208)   (208)  
Other comprehensive income (loss):        
Unrealized gain on cross-currency swap, net of tax     (76)  
Accumulated Other Comprehensive Income
        
Components of and changes in accumulated other comprehensive income        
Balance at beginning of the period     1,761  
Unrealized gain on cross-currency swap, net of tax     (76)  
Foreign currency translation adjustment     (1,597)  
Balance at end of the period 88   88  
Other comprehensive income (loss):        
Unrealized gain on cross-currency swap, net of tax     (76)  
Foreign currency translation adjustment     $ (1,597)