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Fair Value of Assets and Liabilities - Carrying Value and Estimated Fair Value of Financial Instruments (Parenthetical) (Details) | Jun. 30, 2021 | Dec. 31, 2020
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5.875% Senior Notes due 2022 |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Stated interest rate | 5.875% | 5.875%
5.125% Senior Notes due 2023 |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Stated interest rate | 5.125% | 5.125%
5.875% Senior Notes due 2024 |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Stated interest rate | 5.875% | 5.875%
6.00% Senior Notes due 2026 |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Stated interest rate | 6.00% | 6.00%
6.50% Exchangeable Senior Notes due 2026 |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Stated interest rate | 6.50% |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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