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v3.20.1

DEBT OBLIGATIONS, NET - Additional Information (Details) |  |  | 3 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 30, 2020 USD ($) | Feb. 06, 2019 USD ($) | Mar. 31, 2020 USD ($) Extension | Mar. 31, 2019 USD ($) | Mar. 23, 2020 USD ($) | Feb. 26, 2020 USD ($) Extension | Feb. 14, 2020 USD ($) | Dec. 31, 2019 USD ($) Extension | Sep. 25, 2017 USD ($) | Aug. 01, 2014 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Retained earnings, appropriated |  |  | $ 829,300,000 |  |  |  |  |  |  |
Gain (loss) on extinguishment/defeasance of debt |  | $ (1,100,000) | 2,061,000 | $ (1,070,000) |  |  |  |  |  |
Amortization of premium on mortgage loan financing |  |  | (309,000) | $ (386,000) |  |  |  |  |  |
Committed Loan Repurchase Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Committed financing |  |  | 1,550,000,000 |  |  |  |  | $ 1,750,000,000 |  |
Committed Loan Repurchase Facility | Maturing on 19 December 2022 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Committed financing |  |  | $ 500,000,000 |  |  |  | $ 500,000,000.0 | $ 600,000,000.0 |  |
Number of extension maturity periods | Extension |  |  | 2 |  |  |  |  | 2 |  |
Committed Loan Repurchase Facility | Maturing On February 26 2021 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Committed financing |  |  | $ 250,000,000 |  |  |  |  |  |  |
Number of extension maturity periods | Extension |  |  | 3 |  |  |  |  |  |  |
Committed Loan Repurchase Facility | Maturing On February 26 2021 | Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Committed financing |  |  |  |  |  | $ 350,000,000.0 |  |  |  |
Committed Loan Repurchase Facility | Maturing On February 26 2021 | Minimum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Committed financing |  |  |  |  |  | $ 250,000,000.0 |  |  |  |
Number of extension maturity periods | Extension |  |  |  |  |  | 3 |  |  |  |
Committed Loan Repurchase Facility | Maturing on 23 December 2021 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Committed financing |  |  |  |  |  |  |  | $ 500,000,000.0 |  |
Committed amount on credit agreement |  |  |  |  | $ 900,000,000.0 |  |  |  |  |
Committed Loan Repurchase Facility | Maturing on 23 December 2021 | Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Committed financing |  |  |  |  |  | $ 500,000,000.0 |  |  |  |
Committed Securities Repurchase Facility | Maturing on 23 December 2021 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Committed financing |  |  | $ 708,969,000 |  |  |  |  | $ 400,000,000.0 |  |
Committed amount on credit agreement |  |  |  |  | $ 900,000,000.0 |  |  |  |  |
Senior Notes Due 2027 | Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt issued | $ 750,000,000.0 |  | 730,800,000 |  |  |  |  |  |  |
Stated interest rate on debt instrument | 4.25% |  |  |  |  |  |  |  |  |
Debt instrument, minimum number of days to give notice for redemption without penalty | 15 days |  |  |  |  |  |  |  |  |
Debt instrument, maximum number of days to give notice for redemption without penalty | 60 days |  |  |  |  |  |  |  |  |
Debt instrument, repurchased face amount |  |  | 19,200,000 |  |  |  |  |  |  |
Debt instrument, repurchase price amount |  |  | 17,200,000 |  |  |  |  |  |  |
Gain (loss) on extinguishment/defeasance of debt |  |  | 1,700,000 |  |  |  |  |  |  |
Debt issuance costs recognized |  |  | 300,000 |  |  |  |  |  |  |
Senior Notes Due 2025 | Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt issued |  |  | 395,900,000 |  |  |  |  |  | $ 400,000,000.0 |
Stated interest rate on debt instrument |  |  |  |  |  |  |  |  | 5.25% |
Debt instrument, repurchased face amount |  |  | 4,100,000 |  |  |  |  |  |  |
Debt instrument, repurchase price amount |  |  | 4,000,000.0 |  |  |  |  |  |  |
Gain (loss) on extinguishment/defeasance of debt |  |  | 5,800 |  |  |  |  |  |  |
Debt issuance costs recognized |  |  | 39,900 |  |  |  |  |  |  |
Senior Notes Due 2021 | Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt issued |  |  | 265,200,000 |  |  |  |  |  |  | $ 300,000,000.0
Stated interest rate on debt instrument |  |  |  |  |  |  |  |  |  | 5.875%
Debt instrument, repurchased face amount |  |  | 1,000,000.0 |  |  |  |  |  |  |
Debt instrument, repurchase price amount |  |  | 1,000,000.0 |  |  |  |  |  |  |
Gain (loss) on extinguishment/defeasance of debt |  |  | 1,800 |  |  |  |  |  |  |
Debt issuance costs recognized |  |  | $ 3,200 |  |  |  |  |  |  |

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