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Intangible Assets Estimated Future Annual Amortization Expense (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Intangible Assets [Abstract]    
2017 (amount remaining at March 31, 2017) $ 13,709  
2018 12,673  
2019 9,935  
2020 8,077  
2021 7,031  
Beyond 2021 18,060  
Total intangible assets subject to amortization $ 69,485 $ 72,151