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Summary of Significant Accounting Policies (Details 8) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Accumulated other comprehensive items, net          
Accumulated other comprehensive items, net $ (2,335)   $ (2,335)   $ (8,660)
Other Expense (Income), Net:          
Foreign currency transaction losses (gains), net (4,347) 16,366 2,091 19,931  
Other, net (491) (1,091) (1,612) (1,917)  
Total other expense (income), net (4,838) 15,275 479 18,014  
Foreign currency translation adjustments
         
Accumulated other comprehensive items, net          
Accumulated other comprehensive items, net (3,809)   (3,809)   (9,586)
Market value adjustments for securities, net of tax
         
Accumulated other comprehensive items, net          
Accumulated other comprehensive items, net $ 1,474   $ 1,474   $ 926