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Income Taxes Federal Statutory Rate Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |
Income before income taxes | $ 48,832 | $ 96,493 | $ 86,381
Income Tax Statutory Rate Reconciliation [Abstract] |  |  |
“Expected” federal income tax | 10,255 | 33,773 | 30,233
Increase (decrease) in taxes attributable to: |  |  |
State taxes, net of federal income tax benefit | 3,420 | 4,986 | 4,874
Dividend received deduction | (4) | (18) | (21)
Uncertain tax positions | 24 | 12 | 16
Tangible Property Regulations | (899) | (1,159) | (1,184)
Tax reform - rate change impact on deferred taxes | 0 | (2,357) | 0
Reversal of excess deferred taxes recognized in regulatory liability | (1,383) | 0 | 0
Stock-based compensation | (1,602) | (552) | 0
Noncontrolling interest income | 0 | (664) | 0
Other items, net | 254 | 1,372 | (376)
Income Tax Expense (Benefit) | $ 10,065 | $ 35,393 | $ 33,542

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