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Goodwill and Intangible Assets - Goodwill (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
Goodwill rollforward  
Gross carrying Amount, beginning balance $ 238,108
Accumulated Impairment, beginning balance 123,200
Net Amount, beginning balance 114,908
Acquisition 192,223
Gross carrying Amount, ending balance 430,331
Accumulated Impairment, ending balance 123,200
Net Amount, ending balance $ 307,131
Number of trading days considered to calculate market capitalization 10 days
Impairment of goodwill $ 0