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Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2019
Income Taxes [Line Items]
Income tax expense	$ 4,808	$ 4,051	$ 2,645	$ 3,587
Income tax benefit increase amount	800	4,800	900	2,600
Increase in pre-tax loss	2,900		5,600
Ratepayer net refund	107,000		107,000
Unrecognized tax benefits	10,600	11,500	10,600	11,500
Tax benefits that, if recognized, would affect the effective tax rate	$ 3,100	$ 2,200	$ 3,100	$ 2,200
Scenario, Forecast | Minimum
Income Taxes [Line Items]
Effective tax rate estimate					22.00%

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Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Ratepayer Net Refund

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates.

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