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Goodwill and Identifiable Intangible Assets - Activity in Goodwill Balance (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2018
USD ($)
Goodwill [Roll Forward]  
Balance at beginning of period $ 928,993
Goodwill adjustments (2,212)
Effect of foreign currency translation (17,718)
Balance at end of period $ 909,063