Goodwill and Intangible Assets - Estimated Future Amortization Expense by Year (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense	$ 13,200	$ 14,100	$ 12,200
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2016	13,244
2017	13,255
2018	13,079
2019	12,936
2020	$ 12,897