Goodwill and Other Intangible Assets - Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 433,374	$ 421,563	$ 131,014
Other intangible assets, net	347,212	371,416
Total goodwill and other intangible assets, net	$ 780,586	$ 792,979