Goodwill and Other Intangible Assets - Roll Forward of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Goodwill [Roll Forward]
Balance at beginning of year	$ 291,670	$ 291,670
Additions	0	0
Other adjustments	(4,224)	0
Balance at End of Year	$ 287,446	$ 291,670