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Income Taxes (Details 1) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Current income tax (benefit) provision |  |  |
Federal income tax | $ 0 | $ (455) | $ (8,178)
State income tax | 0 | 0 | 21
Net current income tax benefit | 0 | (455) | (8,157)
Deferred income tax provision (benefit) |  |  |
Federal income tax | 29,171 | (20,457) | 0
State income tax | 6,361 | 13,221 | 0
Net deferred income tax benefit | 35,532 | (7,236) | 0
Deferred income tax provision (benefit) |  |  |
Federal tax (benefit) expense at statutory rate | 33,441 | 61,543 | 45,447
State income tax | 6,141 | 16,181 | 368
Permanent differences | (4,267) | (2,488) | (4,740)
AMT credit refundable | 0 | 455 | 8,178
Tax Cuts and Jobs Act rate change | 0 | 0 | 51,525
Change in federal valuation allowance | 0 | (80,003) | (101,917)
Change in state valuation allowance | 217 | (2,924) | 1,139
Net deferred income tax benefit | 35,532 | (7,236) | 0
Net current income tax benefit | 0 | (455) | (8,157)
Total income tax provision (benefit) | $ 35,532 | $ (7,691) | $ (8,157)

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