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Goodwill and Intangible Assets - Estimated Future Amortization (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
Finite-Lived Intangible Assets [Line Items]  
Estimated useful life (in years) 5 years
Estimated Amortization Expense:  
2018 $ 6,619
2019 6,439
2020 6,439
2021 5,624
2022 $ 5,624
Minimum  
Finite-Lived Intangible Assets [Line Items]  
Estimated useful life (in years) 3 years
Maximum  
Finite-Lived Intangible Assets [Line Items]  
Estimated useful life (in years) 15 years