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Debt - Long-term Debt (Details) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018 | Jun. 30, 2017
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt | $ 2,848,492,000 | $ 2,870,993,000 |  |  |  |
Unamortized discount on unsecured senior notes | (3,658,000) | (4,143,000) |  |  |  |
Deferred financing costs, net | (27,422,000) | (33,353,000) |  |  |  |
Total debt per balance sheet | 2,817,412,000 | 2,833,497,000 |  |  |  |
Amortization of debt issuance costs | 7,431,000 | 7,457,000 | $ 10,493,000 |  |  |
Asset-Backed Securitizations, Unsecured Senior Notes and Term Loan Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Amortization of debt issuance costs | 5,900,000 | 5,900,000 | $ 5,800,000 |  |  |
Secured Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total debt | $ 1,948,492,000 | 1,970,993,000 |  |  |  |
Secured Debt | 2014-SFR 2 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate | 4.42% |  |  |  |  |
Total debt | $ 479,981,000 | 485,828,000 |  |  |  |
Secured Debt | 2014-SFR 3 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate | 4.40% |  |  |  |  |
Total debt | $ 495,392,000 | 501,393,000 |  |  |  |
Secured Debt | 2015-SFR 1 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate | 4.14% |  |  |  |  |
Total debt | $ 520,957,000 | 526,560,000 |  |  |  |
Secured Debt | 2015-SFR 2 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate | 4.36% |  |  |  |  |
Total debt | $ 452,162,000 | 457,212,000 |  |  |  |
Exchangeable Senior Notes | 4.25% Senior Notes Due 2028 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate | 4.25% |  |  |  | 4.25% |
Effective interest rate | 4.08% |  |  |  |  |
Total debt | $ 500,000,000 | 500,000,000 |  |  |  |
Deferred financing costs, net |  |  |  |  | $ (1,900,000) |
Exchangeable Senior Notes | 4.90 Percent Senior Notes Due 2029 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate | 4.90% |  |  | 4.90% |  |
Total debt | $ 400,000,000 | 400,000,000 |  |  |  |
Deferred financing costs, net |  |  |  | $ (1,000,000.0) |  |
Line of Credit | Revolving Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate | 1.34% |  |  |  |  |
Total debt | $ 0 | 0 |  |  |  |
Credit facility maximum borrowing capacity |  |  |  |  |  | $ 800,000,000.0
Letters of credit outstanding | $ 1,500,000 | $ 6,200,000 |  |  |  |
Line of Credit | Revolving Credit Facility | LIBOR |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate | 1.20% |  |  |  |  |

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