Goodwill and Other Intangible Assets - Roll Forward of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Goodwill [Roll Forward]
Balance at beginning of year	$ 291,764	$ 175,820
Additions	0	115,944
Other adjustments	(94)	0
Balance at End of Year	$ 291,670	$ 291,764