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Income tax expense (benefit) (Details 2) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Current: |  |  |
Federal | $ 59,483 | $ 4,403 | $ 41,624
State | 5,789 | (166) | 4,148
Foreign | 30 | 0 | (29)
Current income taxes | 65,302 | 4,237 | 45,743
Deferred: |  |  |
Federal | 3,199 | 55,514 | 29,616
State | (2,478) | 2,467 | (859)
Investment tax credit - net | (420) | 1,009 | (206)
Deferred income taxes | 301 | 58,990 | 28,551
Total income tax expense | $ 65,603 | $ 63,227 | $ 74,294

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