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DEBT OBLIGATIONS, NET - Senior Unsecured Notes (Details) - USD ($)				3 Months Ended			12 Months Ended
	Feb. 06, 2019	Sep. 25, 2017	Mar. 16, 2017	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2018	Feb. 24, 2016	Aug. 01, 2014
Debt Instrument [Line Items]
Gain (loss) on extinguishment/defeasance of debt	$ (1,100,000)			$ (1,070,000)	$ (69,000)
Senior Unsecured Notes
Debt Instrument [Line Items]
Unamortized debt issuance costs				10,509,000
Senior Unsecured Notes | Various Date
Debt Instrument [Line Items]
Unamortized debt issuance costs				10,500,000				$ 11,200,000
Debt issued				1,166,201,000				$ 1,166,201,000
Senior Unsecured Notes | 2021 Notes
Debt Instrument [Line Items]
Debt issued				$ 266,201,000						$ 300,000,000
Stated interest rate on debt instrument (as a percent)										5.875%
Debt instrument, minimum number of days to give notice for redemption without penalty						30 days
Debt instrument, maximum number of days to give notice for redemption without penalty						60 days
Debt instrument, authorized repurchase amount									$ 100,000,000.0
Debt instrument, repurchased face amount							$ 33,800,000
Debt instrument, repurchase price amount							28,200,000
Gain (loss) on extinguishment/defeasance of debt							5,100,000
Unamortized debt issuance costs							$ (400,000)
Senior Unsecured Notes | 2022 Notes
Debt Instrument [Line Items]
Debt issued			$ 500,000,000
Stated interest rate on debt instrument (as a percent)			5.25%
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
Senior Unsecured Notes | 2025 Notes
Debt Instrument [Line Items]
Debt issued		$ 400,000,000
Stated interest rate on debt instrument (as a percent)		5.25%
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

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