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SENIOR NOTES, NET - Narrative (Details) - Senior Notes [Member] - USD ($) | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2015
6.00% senior notes due 2025 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate Principal | $ 400,000,000.0 |  |  |  |  |  |
Stated interest rate | 6.00% |  |  |  | 6.00% |  | 6.00%
Senior notes, gross | $ 405,523,000 | [1] |  |  | $ 200,000,000 | [1] | $ 200,000,000
6.00% additional senior notes due 2025 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate Principal |  |  |  | $ 200,000,000.0 |  |  |
Stated interest rate |  |  | 6.00% |  |  |  |
Percentage of premium on debt | 103.00% |  |  |  |  |  |
4.50% senior notes due 2018 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate | 4.50% |  |  |  | 4.50% |  |
Senior notes, gross | $ 0 |  |  |  | $ 175,000,000 |  |
Repayments of Debt | $ 175,000,000 |  |  |  |  |  |
[1] | $200.0 million of the total $400.0 million 6.00% Senior Notes due 2025 outstanding at September 30, 2018 was issued at par and had no unamortized premium.

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