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Income tax expense (benefit) (Details 2) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Current: |  |  |
Federal | $ (3,502) | $ (15,901) | $ 74,272
State | 3,366 | 3,651 | 16,192
Current income taxes | (136) | (12,250) | 90,464
Deferred: |  |  |
Federal | 50,218 | 50,755 | (24,497)
State | 12,098 | 7,206 | (864)
Investment tax credit - net | 1,099 | 1,774 | (62)
Deferred income taxes | 63,415 | 59,735 | (25,423)
Total income tax expense | $ 63,279 | $ 47,485 | $ 65,041

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