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Derivative Instruments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative Instruments, Gain Recognized in Other Comprehensive Income (Loss), Effective Portion $ 1,150 $ (1,282) $ 797
Foreign Currency Contract, Asset, Fair Value Disclosure 707   0
Forward Contracts [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative Instruments, Gain Recognized in Other Comprehensive Income (Loss), Effective Portion 748 (802) 258
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net $ (39) $ (57) $ (472)