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Goodwill and Other Intangible Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Goodwill [Roll Forward]    
Goodwill, Beginning $ 444,085 $ 455,842
Goodwill, Acquired During Period 9,773 1,282
Goodwill, Translation Adjustments (7,574) (13,039)
Goodwill, Ending $ 446,284 $ 444,085