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Income Taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Current tax expense      
Current period $ 13,599 $ 1,461 $ 5,878
Adjustment for prior periods (363) (126) (172)
Current tax expense (income) and adjustments for current tax of prior periods 13,236 1,335 5,706
Deferred tax expense      
Origination and reversal of temporary differences 370 247 1,012
Investment tax credits and operating loss carryforward (1,894) (1,166) (4,525)
Effect of tax rate changes   0 (1,199)
Deferred tax expense (income) (1,524) (919) (4,712)
Total income tax expense $ 11,712 $ 416 $ 994