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Debt - URS Senior Notes (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended |
--- | --- | --- | --- | ---
Aug. 31, 2020 | Jul. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Oct. 17, 2014
Debt |  |  |  |  |
Proceeds from secured delayed draw term loan facility |  | $ 248,500 | $ 409,710 | $ 1,810,509 |
2022 URS Senior Notes |  |  |  |  |
Debt |  |  |  |  |
Remaining principal amount | $ 248,500 |  |  |  |
Interest rate (as a percent) |  |  |  |  | 5.00%
Redemption price (as percent of principal) | 106.835% |  |  |  |
Proceeds from secured delayed draw term loan facility | $ 248,500 |  |  |  |
Prepayment premium | $ 17,000 |  |  |  |

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