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Goodwill and Intangible Assets - Goodwill (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
Goodwill in connection with acquisitions   $ 197,800
Change in goodwill   0
Changes in goodwill    
Balance at end of the period $ 197,797  
Change in goodwill 0  
Balance at end of the period $ 197,797 $ 197,797