Goodwill and Intangible Assets - Finite-lived Intangible Assets Roll Forward (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)
Finite-lived Intangible Assets, Gross [Roll Forward]
Intangible assets, January 1	$ 7,602	$ 7,602
Additions	26,220	0
Total intangible assets, end of period	33,822	7,602
Accumulated amortization
Accumulated amortization	(7,571)	(7,404)
Current year amortization	(1,733)	(84)
Total accumulated amortization	(9,304)	(7,488)
Net intangible assets, end of period	$ 24,518	$ 114