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Goodwill and Other Intangible Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Goodwill [Roll Forward]    
Goodwill, Beginning $ 446,284 $ 444,085
Goodwill, Acquired During Period 41,308 9,773
Goodwill, Translation Adjustments (11,214) (7,574)
Goodwill, Ending $ 476,378 $ 446,284