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Goodwill (Schedule of Changes in the Carrying Amount of Goodwill) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Goodwill [Abstract].    
Goodwill as of January 1 $ 387,108 $ 385,629
Currency translation adjustments and disposition (1,300) 1,500
Goodwill as of December 31 $ 385,849 $ 387,108