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Summary of Significant Accounting Policies - Maturities of Lease Liabilities (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Maturities of lease liabilities: |  |  |  |  |
2020 (excluding the six months ended June 30, 2020) | $ 10,598 |  | $ 10,598 |  |
2021 | 19,113 |  | 19,113 |  |
2022 | 16,138 |  | 16,138 |  |
2023 | 13,767 |  | 13,767 |  |
2024 | 12,294 |  | 12,294 |  |
Thereafter | 46,744 |  | 46,744 |  |
Total Lease Payments | 118,654 |  | 118,654 |  |
Less-Present Value Discount | (18,200) |  | (18,200) |  |
Present Value of Lease Liabilities | 100,454 |  | 100,454 |  | $ 86,713
Supplemental information related to leases: |  |  |  |  |
Cash paid for amounts included in the measurement of lease liabilities | 5,305 | $ 4,095 | 9,778 | $ 7,873 |
Lease right-of-use assets obtained in exchange for lease liabilities | $ 19,922 | $ 14,223 | $ 22,200 | $ 14,397 |

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