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Income Taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Current tax expense      
Current period $ 102,297 $ 13,599 $ 1,461
Adjustment for prior periods 12 (363) (126)
Current tax expense (income) and adjustments for current tax of prior periods 102,309 13,236 1,335
Deferred tax expense      
Origination and reversal of temporary differences 310 370 247
Investment tax credits and operating loss carryforward 8,038 (1,894) (1,166)
Deferred tax expense (income) 8,348 (1,524) (919)
Total income tax expense $ 110,657 $ 11,712 $ 416