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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning of year $ (15,823) $ 25,860  
End of year (48,091) (15,823) $ 25,860
Net derivative instruments [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning of year 0 0 240
Transfer from OCI into earnings 0 0 (240)
End of year 0 0 0
Cumulative translation adjustments [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning of year (15,823) 25,860 12,258
Other comprehensive income (loss) before transfers from OCI into earnings (32,268) (41,683) 13,602
End of year $ (48,091) $ (15,823) $ 25,860