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Fair Value - Carrying Value and Fair Value (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2021 | Sep. 30, 2021 | Dec. 31, 2020
Designated as Hedging Instrument | Treasury Lock |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Derivative, notional amount | $ 400,000 |  |
Term of contract | 10 years |  |
Derivative, fair value |  | $ 4,000 |
Carrying Value |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Asset-backed securitization |  | 1,913,322 | $ 1,927,607
Unsecured senior notes, net |  | 1,621,342 | 889,805
Revolving credit facility |  | 0 | 0
Total debt |  | 3,534,664 | 2,817,412
Carrying Value | 2014-SFR 2 |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Asset-backed securitization |  | 471,457 | 475,144
Carrying Value | 2014-SFR 3 |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Asset-backed securitization |  | 486,475 | 490,319
Carrying Value | 2015-SFR 1 |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Asset-backed securitization |  | 511,627 | 515,326
Carrying Value | 2015-SFR 2 |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Asset-backed securitization |  | 443,763 | 446,818
Carrying Value | 2028 unsecured senior notes, net |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Unsecured senior notes, net |  | 494,970 | 494,378
Carrying Value | 2029 unsecured senior notes, net |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Unsecured senior notes, net |  | 395,849 | 395,427
Carrying Value | 2031 unsecured senior notes |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Unsecured senior notes, net |  | 439,764 | 0
Carrying Value | 2051 unsecured senior notes |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Unsecured senior notes, net |  | 290,759 | 0
Fair Value |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Asset-backed securitization |  | 1,960,184 | 1,983,083
Unsecured senior notes, net |  | 1,789,049 | 1,057,496
Revolving credit facility |  | 0 | 0
Total debt |  | 3,749,233 | 3,040,579
Fair Value | 2014-SFR 2 |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Asset-backed securitization |  | 481,550 | 488,140
Fair Value | 2014-SFR 3 |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Asset-backed securitization |  | 498,225 | 504,364
Fair Value | 2015-SFR 1 |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Asset-backed securitization |  | 523,360 | 529,542
Fair Value | 2015-SFR 2 |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Asset-backed securitization |  | 457,049 | 461,037
Fair Value | 2028 unsecured senior notes, net |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Unsecured senior notes, net |  | 566,865 | 575,220
Fair Value | 2029 unsecured senior notes, net |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Unsecured senior notes, net |  | 468,684 | 482,276
Fair Value | 2031 unsecured senior notes |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Unsecured senior notes, net |  | 447,008 | 0
Fair Value | 2051 unsecured senior notes |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Unsecured senior notes, net |  | $ 306,492 | $ 0

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