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SENIOR NOTES, NET - Schedule of Senior and Convertible Senior Notes (Descriptors) (Details) - Senior Notes [Member] - USD ($) | Dec. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Jun. 30, 2015 | Apr. 30, 2012 | Dec. 31, 2010
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4.50% senior notes due 2018 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Senior and convertible senior notes, gross |  | $ 0 | $ 175,000,000 |  |  |  |
Debt instrument, stated rate |  | 4.50% | 4.50% |  |  |  |
7.15% senior notes due 2020 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Senior and convertible senior notes, gross |  | $ 300,711,000 | $ 301,280,000 |  |  |  |
Aggregate Principal |  |  |  |  |  |  | $ 200,000,000
Debt instrument, stated rate |  | 7.15% | 7.15% |  |  |  | 7.15%
Unamortized premium |  | $ 711,000 | $ 1,280,000 |  |  |  |
7.00% senior notes due 2022 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Senior and convertible senior notes, gross |  | $ 300,000,000 | $ 300,000,000 |  |  |  |
Aggregate Principal |  |  |  |  |  | $ 300,000,000 |
Debt instrument, stated rate |  | 7.00% | 7.00% |  |  | 7.00% |
6.00% senior notes due 2025 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Senior and convertible senior notes, gross | [1] | $ 405,318,000 | $ 200,000,000 |  |  |  |
Aggregate Principal |  | $ 400,000,000.0 |  |  | $ 200,000,000.0 |  |
Debt instrument, stated rate |  | 6.00% | 6.00% |  | 6.00% |  |
Unamortized premium |  |  | $ 0 |  |  |  |
5.125% senior notes due 2027 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Senior and convertible senior notes, gross |  | $ 300,000,000 | $ 300,000,000 |  |  |  |
Aggregate Principal |  |  |  | $ 300,000,000.0 |  |  |
Debt instrument, stated rate |  | 5.125% | 5.125% | 5.125% |  |  |
[1] | (1) $200.0 million of the total $400.0 million of 6.00% Senior Notes due 2025 outstanding at December 31, 2018 was issued at par and had no unamortized premium.

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