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Comprehensive Income (Details 2) (USD $)
In Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Accumulated Other Comprehensive Income [Roll Forward]        
Foreign Currency Translation Adjustment, Beginning Balance     $ 45,905  
Foreign Currency Translation Adjustment, Current Period Change 9,547 (14,535) 16,223 (12,193)
Foreign Currency Translation Adjustment, Ending Balance 62,128   62,128  
Defined Benefit Plans, Beginning Balance     22  
Defined Benefit Plans, Current Period Change 46 35 (125) 274
Defined Benefit Plans, Ending Balance (103)   (103)  
Net Unrealized Losses on Cash Flow Hedges, Beginning Balance     (5,813)  
Net Unrealized Losses on Cash Flow Hedges, Current Period Change (246) (1,219) 444 (1,978)
Net Unrealized Losses on Cash Flow Hedges, Ending Balance (5,369)   (5,369)  
Accumulated Other Comprehensive Income, Beginning Balance     40,114  
Accumulated Other Comprehensive Income, Current Period Change     16,542  
Accumulated Other Comprehensive Income, Ending Balance $ 56,656   $ 56,656