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Debt (6.00% Senior Notes) (Details) - 6.00% Senior Notes due 2026 - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Apr. 18, 2016
Debt Instrument [Line Items] |  |  |
Stated interest rate | 6.00% | 6.00% |
Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 6.00% | 6.00% |
Debt instrument, face amount |  |  | $ 350,000,000.0
Debt instrument, coupon rate | 6.00% |  |
Debt instrument, yield to maturity | 6.00% |  |
Debt instrument, payment terms | Interest on the 6.00% Senior Notes is payable semi-annually on April 15 and October 15 of each year, commencing on October 15, 2016. |  |
Debt instrument, frequency of payment | semi-annually |  |
Debt instrument, commencement date of first required payment | Oct. 15, 2016 |  |
Debt instrument, maturity date | Apr. 15, 2026 |  |
Percentage of principal amount redeemable | 101.00% |  |
Violation or event of default, interest payment failure, term | 30 days |  |
Violation or event of default, interest payment failure, maximum excess proceeds on sale of asset | $ 50,000,000.0 |  |
Violation or event of default, interest payment failure, failure to comply with other indenture agreements, term | 60 days |  |
Senior Notes | Redemption, Period On Or Prior To April 15, 2019 |  |  |
Debt Instrument [Line Items] |  |  |
Percentage of principal amount redeemed | 35.00% |  |
Redemption price percentage | 106.00% |  |
Senior Notes | Redemption, Period On Or Prior To April 15, 2019 | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Notice period prior to redemption | 30 days |  |
Senior Notes | Redemption, Period On Or Prior To April 15, 2019 | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Notice period prior to redemption | 60 days |  |
Senior Notes | Redemption, Period Before April 15, 2021 |  |  |
Debt Instrument [Line Items] |  |  |
Redemption price percentage | 100.00% |  |

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