Intangible Assets Estimated Future Annual Amortization Expense (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
2015 (amount remaining at September 30, 2015)	$ 8,189
2016	25,566
2017	19,005
2018	13,271
2019	10,448
Beyond 2019	35,288
Total intangible assets subject to amortization	$ 111,767	$ 139,909