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Intangible Assets Estimated Future Annual Amortization Expense (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]    
2017 $ 17,914  
2018 12,383  
2019 9,695  
2020 7,866  
2021 6,845  
Beyond 2021 17,448  
Total intangible assets subject to amortization $ 72,151 $ 101,932