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Leases Leases - Maturities of Lease Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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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

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