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Intangible Assets Estimated Future Annual Amortization Expense (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]    
2017 $ 19,380  
2018 16,553  
2019 14,208  
2020 12,162  
2021 9,961  
Beyond 2022 22,964  
Total intangible assets subject to amortization $ 95,228 $ 72,151