Goodwill and Intangible Assets - Finite-lived Intangible Assets Roll Forward (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Finite-lived Intangible Assets, Gross [Roll Forward]
Intangible assets, January 1	$ 34,362	$ 7,602
Additions	0	26,220
Total intangible assets, end of period	34,362	33,822
Accumulated amortization, January 1
Accumulated amortization, January 1	(11,933)	(7,571)
Current year amortization	(5,466)	(1,733)
Total accumulated amortization	(17,399)	(9,304)
Net intangible assets, end of period	$ 16,963	$ 24,518