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Debt (Details Textual) - USD ($) |  |  |  | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2021 | Mar. 01, 2021 | Jun. 01, 2020 | Mar. 31, 2021 | Mar. 31, 2021 | Mar. 31, 2020 | Dec. 14, 2020 | May 31, 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Loss on debt extinguishments |  |  |  |  | $ (9,173,000) | $ 0 |  |
Senior Notes due 2024 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | $ 375,000,000.0 |  |  | $ 375,000,000.0 | $ 375,000,000.0 |  |  |
Proceeds from Debt |  |  |  | $ 367,500,000 |  |  |  |
Loss on debt extinguishments | $ 9,200,000 |  |  |  |  |  |  |
Stated interest rate | 5.125% |  |  | 5.125% | 5.125% |  |  | 5.875%
Letters of Credit Outstanding, Amount | $ 230,000,000.0 |  |  | $ 230,000,000.0 | $ 230,000,000.0 |  |  |
Debt instrument, redemption price, percentage |  |  |  | 105.125% |  |  |  |
Repayments of Senior Debt | $ 127,200,000 | $ 102,800,000 |  |  |  |  |  |
Debt Instrument, Redemption Price, Per $1000 Of Principal |  |  | $ 1,029.38 |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Stated interest rate | 2.40% |  |  | 2.40% | 2.40% |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  | $ 300,000,000.0 |
Letters of Credit Outstanding, Amount | $ 35,000,000.0 |  |  | $ 35,000,000.0 | $ 35,000,000.0 |  |  |
Line of Credit Facility, Increase (Decrease), Net |  | $ 100,000,000.0 |  |  |  |  |  |

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