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Debt Obligations - Convertible Senior Unsecured Notes (Details) | 1 Months Ended | 12 Months Ended |
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Aug. 31, 2021 USD ($) | Jul. 31, 2021 USD ($) shares | Apr. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Apr. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Oct. 31, 2019 USD ($) | Mar. 31, 2019 USD ($) | May 31, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2021 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Nov. 30, 2019 USD ($) $ / shares
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid for the exchange of convertible notes |  |  |  |  |  |  |  |  |  |  |  | $ 22,336,000 |  |
Notes settled with cash |  |  |  |  |  |  |  |  |  |  | $ 14,300,000 |  | $ 231,940,000 |
Gain (loss) on real estate |  |  |  |  |  |  |  |  |  |  | (3,374,000) | (3,546,000) | (7,439,000) |
Total |  |  |  |  |  |  |  |  |  |  | 12,132,490,000 |  |  |
Convertible Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Junior subordinated notes |  |  |  |  |  |  |  |  |  |  | $ 264,000,000 | $ 278,300,000 |  |
Percentage of the Notes required to be repurchased if the agreement is fundamentally changed |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |
Maturity period (in years) |  |  |  |  |  |  |  |  |  |  | 10 months 2 days | 1 year 9 months 7 days |  |
Unamortized Debt Discount |  |  |  |  |  |  |  |  |  |  | $ 2,520,000 | $ 5,636,000 |  |
Unamortized Deferred Financing Fees |  |  |  |  |  |  |  |  |  |  | 2,095,000 | 4,691,000 |  |
Total |  |  |  |  |  |  |  |  |  |  | 259,385,000 | 267,973,000 |  |
Net Carrying Value, Equity Component |  |  |  |  |  |  |  |  |  |  | 8,684,000 | 9,962,000 |  |
Interest expense |  |  |  |  |  |  |  |  |  |  | 18,600,000 | 20,000,000.0 | 28,300,000 |
Interest expense related to cash coupon |  |  |  |  |  |  |  |  |  |  | 12,800,000 | 13,400,000 | 13,500,000 |
Debt discount |  |  |  |  |  |  |  |  |  |  | 3,200,000 | 3,000,000.0 | 6,800,000 |
Deferred fees expensed as interest expense |  |  |  |  |  |  |  |  |  |  | $ 2,600,000 | $ 3,600,000 | $ 7,900,000 |
Cost of the notes (as a percent) |  |  |  |  |  |  |  |  |  |  | 6.71% | 6.75% |  |
Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Junior subordinated notes |  |  |  |  |  |  |  |  |  |  | $ 1,295,750,000 | $ 670,750,000 |  |
Unamortized Deferred Financing Fees |  |  |  |  |  |  |  |  |  |  | 15,200,000 | 7,900,000 |  |
8.00% Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Junior subordinated notes |  |  |  |  | $ 40,500,000 |  |  |  |  |  | $ 70,750,000 | 70,750,000 |  |
Proceeds from issued debt |  |  |  | $ 30,300,000 | $ 69,600,000 |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  | 8.00% |  |  |  |  |  | 8.00% |  |  |
4.50% Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Junior subordinated notes | $ 270,000,000.0 |  |  |  |  | $ 275,000,000.0 |  |  |  |  | $ 275,000,000 | 275,000,000 |  |
Proceeds from issued debt | $ 265,800,000 |  |  |  |  | $ 271,800,000 |  |  |  |  |  |  |  |
Interest rate (as a percent) | 4.50% |  |  |  |  | 4.50% |  |  |  |  | 4.50% |  |  |
5.25% Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Junior subordinated notes |  | $ 14,300,000 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 5.25% |  |  |  |  |  |  |  |  | 5.25% |  |  |
Notes settled with cash |  | $ 14,300,000 |  |  |  |  |  |  |  |  | $ 228,700,000 |  |  |
Common stock exchanged (in shares) | shares |  | 386,459 |  |  |  |  |  |  |  |  |  |  |  |
4.75% Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Junior subordinated notes |  |  |  |  |  |  | $ 110,000,000.0 |  |  |  | $ 1,000 | $ 1,000 |  | $ 264,000,000.0
Proceeds from issued debt |  |  |  |  |  |  | $ 108,200,000 |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  | 4.75% |  |  |  | 4.75% |  |  | 4.75%
Proceeds received, net of estimated issuance costs |  |  |  |  |  |  |  |  |  |  | $ 256,500,000 |  |  |
Common stock exchanged (in shares) | shares |  |  |  |  |  |  |  |  |  |  | 56.8560 |  |  |
Conversion rate of the notes to common stock, per $1,000 principal amount of notes |  |  |  |  |  |  |  |  |  |  |  | 56.1695 |  |
Conversion price per share of common stock | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 17.59 |  |  | $ 17.80
4.75% Convertible Notes | Over-Allotment Option |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Junior subordinated notes |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 34,000,000.0
5.75% Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Junior subordinated notes |  |  |  |  |  |  |  | $ 90,000,000.0 |  |  | $ 90,000,000 | $ 90,000,000 |  |
Proceeds from issued debt |  |  |  |  |  |  |  | $ 88,200,000 |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  | 5.75% |  |  | 5.75% |  |  |
4.75% and 5.25% Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes and accrued interest settled |  |  |  |  |  |  |  |  |  |  | $ 233,100,000 |  |  |
Common stock exchanged (in shares) | shares |  |  |  |  |  |  |  |  |  |  | 4,478,315 |  |  |
Gain (loss) on real estate |  |  |  |  |  |  |  |  |  |  |  | 7,300,000 |  |
Inducement charge |  |  |  |  |  |  |  |  |  |  |  | 1,100,000 |  |
5.625% Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Junior subordinated notes |  |  |  |  |  |  |  |  |  | $ 100,000,000.0 | $ 125,000,000 | 125,000,000 |  |
Proceeds from issued debt |  |  |  |  |  |  |  |  | $ 25,000,000.0 | $ 122,300,000 |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  | 5.625% | 5.625% |  |  |
5.00% Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Junior subordinated notes |  |  | $ 175,000,000.0 |  |  |  |  |  |  |  | $ 175,000,000 |  |  |
Proceeds from issued debt |  |  | $ 172,300,000 |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 5.00% |  |  |  |  |  |  |  | 5.00% |  |  |
Junior subordinated notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Junior subordinated notes |  |  |  |  |  |  |  |  |  |  | $ 154,336,000 | 154,336,000 |  |
Deferred fees expensed as interest expense |  |  |  |  |  |  |  |  |  |  | $ 1,700,000 | $ 1,800,000 |  |

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