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INCOME TAXES (Tables) | 12 Months Ended
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Dec. 31, 2020
INCOME TAXES |
Schedule of components of the income tax benefit (expense) | Income tax benefit (expense) consists of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
(In thousands) |  | 2020 |  | 2019 |  | 2018
Current |  | ​ |  |  | ​ |  |  | ​ |
State | ​ | $ | (11) | ​ | $ | (26) | ​ | $ | 19
Deferred | ​ |  | ​ | ​ |  |  | ​ |  |
Federal | ​ |  | (60,408) | ​ |  | (41,567) | ​ |  | 190,195
State | ​ |  | (12) | ​ |  | (309) | ​ |  | 5,859
​ | ​ |  | (60,420) | ​ |  | (41,876) | ​ |  | 196,054
Total income tax benefit (expense), net | ​ | $ | (60,431) | ​ | $ | (41,902) | ​ | $ | 196,073
Schedule of differences between expected U.S. federal statutory income tax to income tax expense | The impacts of the differences between the expected U.S. federal statutory income tax to our income tax expense are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | Year Ended December 31,
(In thousands) |  | 2020 |  | 2019 |  | 2018
Expected tax at federal statutory rate | ​ | $ | 74,392 | ​ | $ | 48,908 | ​ | $ | 44,154
State income tax, net of federal benefit | ​ |  | (26) | ​ |  | 325 | ​ |  | (5,878)
Non-deductible executive compensation | ​ |  | — | ​ |  | — | ​ |  | 747
Noncontrolling interest | ​ | ​ | (14,577) | ​ | ​ | (7,078) | ​ | ​ | (2,367)
Other | ​ |  | 839 | ​ |  | 326 | ​ |  | 310
Change in valuation allowance | ​ |  | (197) | ​ |  | (579) | ​ |  | (233,039)
Income tax expense (benefit), net | ​ | $ | 60,431 | ​ | $ | 41,902 | ​ | $ | (196,073)
​
Schedule of deferred tax assets and deferred tax liabilities | Significant components of our deferred tax assets and deferred tax liabilities are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of December 31,
(In thousands) |  | 2020 |  | 2019
Deferred tax assets | ​ | ​ | ​ | ​ | ​ | ​
Net operating loss carryforwards | ​ | $ | 121,839 | ​ | $ | 172,359
Research and development tax credit carryforwards | ​ |  | 55,211 | ​ |  | 55,966
Other | ​ |  | 1,100 | ​ |  | 1,412
Total deferred tax assets before valuation allowance | ​ |  | 178,150 | ​ |  | 229,737
Valuation allowance | ​ |  | (63,423) | ​ |  | (63,620)
Total deferred tax assets | ​ | ​ | 114,727 | ​ | ​ | 166,117
Deferred tax liabilities | ​ | ​ | ​ | ​ | ​ | ​
Debt issuance discount and other | ​ | ​ | (10,596) | ​ | ​ | (11,946)
Unrealized Gain on Investment | ​ | ​ | (10,372) | ​ | ​ | —
Net deferred tax assets | ​ | $ | 93,759 | ​ | $ | 154,171
Summary of changes in unrecognized tax benefits | A reconciliation of the beginning and ending balances of the total amounts of unrecognized tax benefits are as follows: ​
​ | ​ | ​ | ​
(In thousands) | ​ | ​ | ​
Unrecognized tax benefits as of December 31, 2017 | ​ | $ | 15,488
Gross decrease in tax portions for 2018 | ​ | ​ | (75)
Unrecognized tax benefits as of December 31, 2018 |  | ​ | 15,413
Gross decrease in tax portions for 2019 | ​ | ​ | (71)
Unrecognized tax benefits as of December 31, 2019 | ​ | ​ | 15,342
Net decrease in tax portions for 2020 | ​ |  | (157)
Unrecognized tax benefits as of December 31, 2020 | ​ | $ | 15,185

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