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Goodwill and Intangible Assets - Estimated Future Amortization (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2019
USD ($)
Finite-Lived Intangible Assets [Line Items]  
Estimated useful life (in years) 5 years
Estimated Annual Amortization Expense:  
2019 $ 815
2020 814
2021 0
2022 0
2023 $ 0
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