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Fair Value - Carrying Value and Fair Value (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Gain on settlement of cash flow hedging instrument | $ 9,600 | $ 0 | $ 0 | $ 9,553 |
Reclassified during next 12 months, net |  | 1,000 |  |  |
Designated as Hedging Instrument | Treasury Lock |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Derivative, notional amount |  |  |  |  | $ 350,000
Carrying Value |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Revolving credit facility |  | 0 | 0 |  |
Total debt |  | 2,817,412 | 2,833,497 |  |
Carrying Value | 2014-SFR 2 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Asset-backed securitization |  | 475,144 | 479,706 |  |
Carrying Value | 2014-SFR 3 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Asset-backed securitization |  | 490,319 | 495,029 |  |
Carrying Value | 2015-SFR 1 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Asset-backed securitization |  | 515,326 | 519,576 |  |
Carrying Value | 2015-SFR 2 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Asset-backed securitization |  | 446,818 | 450,733 |  |
Carrying Value | Senior Notes Due 2028 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Unsecured senior notes |  | 494,378 | 493,589 |  |
Carrying Value | Senior Notes Due 2029 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Unsecured senior notes |  | 395,427 | 394,864 |  |
Carrying Value | Asset-backed securitization |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Asset-backed securitization |  | 1,927,607 | 1,945,044 |  |
Carrying Value | Unsecured Senior Notes |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Unsecured senior notes |  | 889,805 | 888,453 |  |
Fair Value |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Revolving credit facility |  | 0 | 0 |  |
Total debt |  | 3,040,579 | 2,981,475 |  |
Fair Value | 2014-SFR 2 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Asset-backed securitization |  | 488,140 | 491,302 |  |
Fair Value | 2014-SFR 3 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Asset-backed securitization |  | 504,364 | 510,486 |  |
Fair Value | 2015-SFR 1 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Asset-backed securitization |  | 529,542 | 534,531 |  |
Fair Value | 2015-SFR 2 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Asset-backed securitization |  | 461,037 | 466,558 |  |
Fair Value | Senior Notes Due 2028 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Unsecured senior notes |  | 575,220 | 531,870 |  |
Fair Value | Senior Notes Due 2029 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Unsecured senior notes |  | 482,276 | 446,728 |  |
Fair Value | Asset-backed securitization |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Asset-backed securitization |  | 1,983,083 | 2,002,877 |  |
Fair Value | Unsecured Senior Notes |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Unsecured senior notes |  | $ 1,057,496 | $ 978,598 |  |

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