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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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