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Accumulated Other Comprehensive Income (Schedule Of Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Accumulated Other Comprehensive Income [Abstract]      
Beginning balance, Unrealized Gain (Loss) on Investments, Net of Tax $ (225)    
Beginning balance, Unrealized Gain (Loss) on Derivative Instruments, Net of Tax 2,217    
Beginning balance, Unrealized Gain On Net Investment Hedge, Net Of Tax 1,894    
Beginning balance, Cumulative Translation Adjustment (46,151)    
Other comprehensive income (loss) before reclassifications, Unrealized Gain (Loss) on Investments, Net of Tax 205 $ 33  
Other comprehensive income (loss) before reclassifications, Unrealized Gain (Loss) on Derivative Instruments, Net of Tax (3,266) 7,185  
Other comprehensive income (loss) before reclassifications, Unrealized Gain On Net Investment Hedge, Net Of Tax 2,224    
Other comprehensive income (loss) before reclassifications, Cumulative Translation Adjustment 6,016 (20,232)  
Other comprehensive income (loss) before reclassifications, Cumulative Translation Adjustment (46,151)   $ (40,135)
Gains reclassified from accumulated other comprehensive income, Unrealized Gain (Loss) on Derivative Instruments, Net of Tax (429) $ (2,964)  
Ending balance, Unrealized Gain (Loss) on Investments, Net of Tax (20)    
Ending balance, Unrealized Gain (Loss) on Derivative Instruments, Net of Tax (1,478)    
Ending balance, Unrealized Gain On Net Investment Hedge, Net Of Tax 4,118    
Ending balance, Cumulative Translation Adjustment (40,135)    
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance (42,265)    
Accumulated Other Comprehensive Income, before Tax     $ 5,179
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax (429)    
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance $ (37,515)