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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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