Goodwill and Other Intangible Assets (Details) - Other Intangible Assets - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Finite-lived Intangible Assets [Roll Forward]
Balance at the beginning of the year, gross	$ 58,959	$ 48,550
Balance at the beginning of the year, accumulated amortization	32,962	28,280
Balance at the beginning of the year, net	25,997	20,270
Additions	39,017	10,925
Amortization expense	1,965	985
Balance at the end of the year, gross	97,976	59,475
Balance at the end of the year, accumulated amortization	34,927	29,265
Balance at the end of the year, net	$ 63,049	$ 30,210