Intangible Assets Estimated Future Annual Amortization Expense (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
2014 (amount remaining at June 30, 2014)	$ 22,200
2015	35,643
2016	28,062
2017	20,895
2018	14,674
Beyond 2018	51,453
Total intangible assets subject to amortization	$ 172,927	$ 195,840