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Intangible Assets Estimated Future Annual Amortization Expense (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]    
2014 (amount remaining at March 31, 2014) $ 33,305  
2014 35,630  
2015 28,025  
2016 20,836  
2017 14,655  
Beyond 2018 51,601  
Total intangible assets subject to amortization $ 184,052 $ 195,840