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Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Statement of Comprehensive Income [Abstract]        
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment $ (10,023) $ (8,162) $ (4,448) $ 324
Accumulated Other Comprehensive Income (Loss), Derivatives, Net of Tax 0 0 (122) (208)
Changes in fair value of derivative, net of tax 0 122 86  
Other Comprehensive Income (Loss), Net of Tax (1,861) (3,592) (4,686)  
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax (1,861) (3,714) (4,772)  
Accumulated other comprehensive loss $ (10,023) $ (8,162) $ (4,570) $ 116