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 ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]        
Amortization expense of intangible assets $ 2.6 $ 4.1 $ 4.1 $ 9.3