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Goodwill and Intangible Assets - Goodwill (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
Changes in goodwill  
Balance at beginning of the period $ 197,797
Balance at end of the period 197,797
Business Acquisitions  
Changes in goodwill  
Balance at beginning of the period 197,800
Balance at end of the period 197,800
Goodwill impairment loss $ 0