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BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Consolidated Balance Sheets (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | --- | --- | --- | ---
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |
Accumulated depletion, depreciation, amortization and impairment | $ (5,616,988) |  |  | $ (4,640,098) |  |  |  |
Property and equipment, net | 5,030,958 |  |  | 5,479,405 |  |  |  |
Deferred tax asset | 323,378 |  |  | 0 |  |  |  |
Total other assets | 501,803 |  |  | 255,268 |  |  |  |
Total assets | 5,837,098 |  |  | 6,051,036 |  |  |  |
Accumulated deficit | (1,032,972) |  |  | (845,368) |  |  |  |
Total stockholders’ equity | 3,123,104 | $ 3,607,408 | $ 3,368,266 | 3,327,768 | $ 3,292,015 | $ 3,195,199 | $ 3,088,889 | $ 3,101,614
Total liabilities and stockholders’ equity | 5,837,098 |  |  | 6,051,036 |  |  |  |
Capitalized costs of oil and natural gas properties excluded from amortization | 2,260,759 |  |  | $ 2,873,037 |  |  |  |
As Reported |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |
Accumulated depletion, depreciation, amortization and impairment | (5,063,413) |  |  |  |  |  |  |
Property and equipment, net | 5,584,533 |  |  |  |  |  |  |
Deferred tax asset | 205,853 |  |  |  |  |  |  |
Total other assets | 384,278 |  |  |  |  |  |  |
Total assets | 6,273,148 |  |  |  |  |  |  |
Accumulated deficit | (596,922) |  |  |  |  |  |  |
Total stockholders’ equity | 3,559,154 |  |  |  |  |  |  |
Total liabilities and stockholders’ equity | 6,273,148 |  |  |  |  |  |  |
Capitalized costs of oil and natural gas properties excluded from amortization | 2,814,334 |  |  |  |  |  |  |
Adjustments |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |
Accumulated depletion, depreciation, amortization and impairment | (553,575) |  |  |  |  |  |  |
Property and equipment, net | (553,575) |  |  |  |  |  |  |
Deferred tax asset | 117,525 |  |  |  |  |  |  |
Total other assets | 117,525 |  |  |  |  |  |  |
Total assets | (436,050) |  |  |  |  |  |  |
Accumulated deficit | (436,050) |  |  |  |  |  |  |
Total stockholders’ equity | (436,050) |  |  |  |  |  |  |
Total liabilities and stockholders’ equity | (436,050) |  |  |  |  |  |  |
Capitalized costs of oil and natural gas properties excluded from amortization | $ (553,575) |  |  |  |  |  |  |

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