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SENIOR NOTES, NET - Schedule of Senior and Convertible Senior Notes (Details) - Senior Notes [Member] - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Instrument [Line Items] |  |  |
Net debt issuance costs |  | $ (8,327) | $ (10,745)
Senior and convertible senior notes, net |  | 996,105 | 1,295,284
7.15% senior notes due 2020 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Senior and convertible senior notes, gross |  | 0 | 300,711
7.00% senior notes due 2022 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Senior and convertible senior notes, gross |  | 300,000 | 300,000
6.00% senior notes due 2025 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Senior and convertible senior notes, gross | [1] | 404,432 | 405,318
5.125% senior notes due 2027 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Senior and convertible senior notes, gross |  | $ 300,000 | $ 300,000
[1] | $200.0 million of the total $400.0 million of 6.00% Senior Notes due 2025 outstanding at December 31, 2019 was issued at par and had no unamortized premium.

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