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Goodwill and Intangible Assets - Estimated Future Amortization (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Finite-Lived Intangible Assets [Line Items]    
Estimated useful life (in years) 5 years  
Estimated Amortization Expense:    
2018 $ 6,619 $ 6,619
2019 6,439 6,439
2020 6,439 6,439
2021 5,624 5,624
2022 $ 5,624 $ 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