Summary of Significant Accounting Policies - Amortization Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Aggregate amortization expense
Aggregate amortization expense	$ 23,395	$ 21,039	$ 20,934
Estimated amortization expense related to intangible assets
2016	22,841
2017	17,302
2018	14,006
2019	11,127
2020	6,390
Thereafter	24,671
Total finite lived intangibles, net	96,337
Trademarks	1,040
Total intangible assets	$ 97,377	$ 88,175