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Intangible Assets Estimated Future Annual Amortization Expense (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]    
2017 (amount remaining at June 30, 2017) $ 11,103  
2018 18,761  
2019 16,050  
2020 13,698  
2021 11,799  
Beyond 2021 32,023  
Total intangible assets subject to amortization $ 103,434 $ 72,151