Intangible Assets Estimated Future Annual Amortization Expense (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
2015 (amount remaining at June 30, 2015)	$ 16,263
2016	25,256
2017	18,607
2018	12,844
2019	9,996
Beyond 2019	34,170
Total intangible assets subject to amortization	$ 117,136	$ 139,909