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Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2013
Accumulated Other Comprehensive (Loss) Income          
Beginning Balance $ (27,221) $ (24,274) $ (33,977) $ (19,495)  
Other comprehensive loss before reclassifications   (2,685)   (7,464)  
Amounts reclassified from accumulated other comprehensive loss   (1,066)   (1,066)  
Other comprehensive income (loss) 5,437 (3,751) 12,193 (8,530)  
Ending Balance $ (21,784) $ (28,025) $ (21,784) $ (28,025)  
ISRAEL          
Accumulated Other Comprehensive (Loss) Income          
Accumulated foreign exchange translation gains         $ 1,100