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Summary of significant accounting policies (Details 5) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Components of and changes in accumulated other comprehensive income      
Balance at the beginning of the period $ 5,390    
Unrealized loss on cross-currency swaps, net of tax of $167 & $(36) (437) (90) (2,702)
Foreign currency translation adjustment (3,192) (1,710) 7,006
Balance at the end of the period 1,761 5,390  
Tax on unrealized loss on cross-currency swaps 256 36 1,050
Foreign Currency Translation Adjustments
     
Components of and changes in accumulated other comprehensive income      
Balance at the beginning of the period 5,085 6,795  
Foreign currency translation adjustment (3,192) (1,710)  
Balance at the end of the period 1,893 5,085  
Fair Value of Cross-Currency Swaps
     
Components of and changes in accumulated other comprehensive income      
Balance at the beginning of the period 305 395  
Unrealized loss on cross-currency swaps, net of tax of $167 & $(36) (437) (90)  
Balance at the end of the period (132) 305  
Accumulated other comprehensive income (Loss)
     
Components of and changes in accumulated other comprehensive income      
Balance at the beginning of the period 5,390 7,190  
Unrealized loss on cross-currency swaps, net of tax of $167 & $(36) (437) (90) (2,702)
Foreign currency translation adjustment (3,192) (1,710) 7,006
Balance at the end of the period $ 1,761 $ 5,390 $ 7,190