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Leases Leases - Maturities of Lease Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Maturities of Lease Liabilities Under Topic 842    
Remainder of 2019 $ 2,041  
2020 8,304  
2021 8,204  
2022 7,133  
2023 6,505  
2024 and thereafter 15,196  
Total lease payments 47,383  
Less: imputed interest 5,408  
Present value of lease liabilities 41,975  
Legally binding minimum lease payments on leases not yet commenced 9,100  
Amount (less than) for options to extend lease $ 100  
Future Minimum Lease Payments Under Topic 840    
2019 (Prior to Topic 842)   $ 7,044
2020 (Prior to Topic 842)   7,168
2021 (Prior to Topic 842)   6,974
2022 (Prior to Topic 842)   6,719
2023 (Prior to Topic 842)   6,348
2024 and thereafter (Prior to Topic 842)   14,838
Total (Prior to Topic 842)   $ 49,091