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SENIOR NOTES, NET - Schedule of Senior Notes, Net (Details) - Senior Notes [Member] - USD ($) | Sep. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2015
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |
Net debt issuance costs | $ (11,322,000) |  | $ (9,830,000) |  |
Senior notes, net | 1,295,054,000 |  | 1,266,450,000 |  |
4.50% senior notes due 2018 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior notes, gross | $ 0 |  | $ 175,000,000 |  |
Stated interest rate | 4.50% |  | 4.50% |  |
7.15% senior notes due 2020 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior notes, gross | $ 300,853,000 |  | $ 301,280,000 |  |
Stated interest rate | 7.15% |  | 7.15% |  |
Unamortized premium | $ 853,000 |  | $ 1,280,000 |  |
7.00% senior notes due 2022 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior notes, gross | $ 300,000,000 |  | $ 300,000,000 |  |
Stated interest rate | 7.00% |  | 7.00% |  |
6.00% senior notes due 2025 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior notes, gross | $ 405,523,000 | [1] | $ 200,000,000 | [1] | $ 200,000,000
Stated interest rate | 6.00% |  | 6.00% |  | 6.00%
Unamortized premium | $ 5,523,000 |  | $ 0 |  |
5.125% senior notes due 2027 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior notes, gross | $ 300,000,000 |  | $ 300,000,000 |  |
Stated interest rate | 5.125% |  | 5.125% |  |
[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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