Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Intangible Assets - Narrative (Details)

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Goodwill and Intangible Assets - Narrative (Details) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]      
Amortization of intangible assets $ 7,500,000 $ 2,700,000  
Goodwill accumulated impairment loss $ 0   $ 0