Goodwill and Intangible Assets - Amortization (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Amortization expense
Amortization expense	$ 16,600	$ 16,000	$ 15,300
Estimated remaining amortization expense
2016	16,470
2017	15,527
2018	13,939
2019	13,393
2020	12,965
Thereafter	90,171
Intangible Assets, Net (finite life)	$ 162,465