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Intangible Assets Estimated Future Annual Amortization Expense (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]    
2016 (amount remaining at March 31, 2016) $ 19,031  
2017 18,841  
2018 13,132  
2019 10,325  
2020 8,423  
Beyond 2020 26,634  
Total intangible assets subject to amortization $ 96,386 $ 101,932