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v3.21.2

Senior Notes (Details) |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
May 31, 2018 | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | May 13, 2021 USD ($) | Dec. 31, 2020 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |
Accumulated Amortization, Debt Premium |  |  |  |  |  |  | $ 221,000
Accumulated Amortization, Debt Issuance Costs |  | $ 1,161,000 |  | $ 1,161,000 |  |  | 819,000
Credit Facility amortization of debt issuance costs |  |  |  | 345,000 | $ 393,000 |  |
Gain (Loss) on Extinguishment of Debt |  | $ (23,807,000) | $ 0 | (23,807,000) | 0 |  |
Debt Issuance Costs, Gross |  |  |  |  |  | $ 800,000 |
Write-off Of Unamortized Debt Issuance Costs |  |  |  | 1,800,000 |  |  |
Write-off Of Unamortized Debt Premium |  |  |  | (1,400,000) |  |  |
Write off of Deferred Debt Issuance Cost |  |  |  | $ 3,400,000 |  |  |
Redemption period |  |  |  | 180 days |  |  |
Minimum [Member] | Ratio Actual [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Ratio of indebtedness to net capital (in Ratio) (below at March 31, 2015) |  | 0.25 |  | 0.25 |  |  |
Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal amount |  | $ 400,000,000.0 |  | $ 400,000,000.0 |  |  |
Accumulated amortization, debt discount |  | 62,000 |  | 62,000 |  |  | 1,293,000
Accumulated Amortization, Debt Issuance Costs |  | 18,000 |  | 18,000 |  |  | 496,000
Long-term Debt, Fair Value |  | 399,500,000 |  | 399,500,000 |  |  |
Acquisition debt imputed interest expense |  | 6,642,000 | 6,625,000 | 13,267,000 | 13,250,000 |  |
Credit Facility amortization of debt issuance costs |  | 53,000 | $ 69,000 | $ 127,000 | $ 136,000 |  |
Senior Notes [Member] | Period One |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Percentage of principal amount redeemed | 40.00% |  |  |  |  |  |
Senior Notes [Member] | Period Two |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Redemption price percentage | 102.13% |  |  |  |  |  |
Percentage of principal amount redeemed | 50.00% |  |  |  |  |  |
Senior Notes [Member] | Period Three |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Redemption price percentage | 101.06% |  |  |  |  |  |
Senior Notes [Member] | Period Four |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Redemption price percentage | 104.25% |  |  |  |  |  |
Senior Notes [Member] | Period Five |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Redemption price percentage |  |  |  | 101.00% |  |  |
Senior Notes [Member] | Period Six |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Redemption price percentage |  |  |  | 100.00% |  |  |
Senior Notes [Member] | Senior Note One [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate During Period |  |  |  |  | 6.69% |  |
Debt Instrument, Discount Rate |  |  | 6.87% | 4.42% |  |  |
Accretion of debt discount, net of debt premium on senior notes |  | $ 128,000 | $ 131,000 | $ 266,000 | $ 260,000 |  |
Senior Notes [Member] | Senior Note Two [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate percentage |  | 6.625% |  | 6.625% |  |  |
Debt Instrument, Interest Rate During Period |  |  |  | 4.30% | 6.88% |  |
Debt Instrument, Discount Rate |  |  | 6.20% |  |  |  |
Accretion of debt discount, net of debt premium on senior notes |  | $ 27,000 |  | $ 85,000 |  |  |
Senior Notes [Member] | Senior Notes Due 2026 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | $ 400,000,000
Acquisition debt imputed interest expense |  |  |  | 13,250,000 |  |  |
Proceeds from Issuance of Senior Long-term Debt |  |  |  | 395,500,000 |  |  |
Debt Issuance Costs, Gross |  | 1,300,000 |  | 1,300,000 |  |  |
Debt Instrument, Unamortized Discount |  | $ 4,500,000 |  | $ 4,500,000 |  |  |
Debt Instrument, Unamortized Discount In Percent |  |  |  | 1.125% |  |  |
Early Repayment of Senior Debt |  |  |  | $ 19,900,000 |  |  |
Senior Notes [Member] | Senior Notes Due 2026 | Period One |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Redemption price percentage | 104.97% |  |  |  |  |  |
Senior Notes 4.25% |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Term |  |  |  | 95 months |  |  |
Gain (Loss) on Extinguishment of Debt |  |  |  | $ 23,700,000 |  |  |
Senior Notes 4.25% | Senior Note Two [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate percentage |  | 4.25% |  | 4.25% |  |  |

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