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Income Taxes Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Income Tax Disclosure [Abstract] |  |
Federal income taxes at statutory rates | $ 30,639 | $ 13,790
Federal income taxes at statutory rates | 21.00% | 21.00%
Tax effect of regulatory treatment of utility plant differences | $ (2,080) | $ (1,018)
Tax effect of regulatory treatment of utility plant differences | (1.40%) | (1.60%)
State income tax expense | $ 1,659 | $ 964
State income tax expense | 1.10% | 1.50%
Acquisition costs | $ (1,824) | $ 46
Acquisition costs | (1.20%) | 0.10%
Settlement of equity awards | $ 612 | $ (990)
Settlement of equity awards | 0.40% | (1.50%)
Other | $ 1,011 | $ (2,082)
Other | 0.70% | (3.20%)
Income Tax Expense (Benefit) | $ 30,017 | $ 10,710
Effective Income Tax Rate | 20.60% | 16.30%

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