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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Net Income $ 86,847 $ 82,345 $ 72,439
Unrealized Gain (Loss) on Available-for-Sale Securities:      
Reversal of Previously Recognized Losses (Gains) Realized on Sale of Investments and Included in Other Income During Period 16 (105) (15)
Unrealized Gains (Losses) Arising During Period 147 (61) 115
Income Tax (Expense) Benefit (34) 35 (35)
Change in Unrealized Gain (Loss) on Available-for-Sale Securities – net-of-tax 129 (131) 65
Pension and Postretirement Benefit Plans:      
Actuarial (Losses) Gains net of Regulatory Allocation Adjustment (2,779) 1,919 (3,791)
Amortization of Unrecognized Postretirement Benefit Losses and Costs (note 11) 565 985 629
Income Tax Benefit (Expense) 576 (755) 1,266
Adjustment to Income Tax Expense Related to 2017 Tax Cuts and Jobs Act 0 (531) 0
Pension and Postretirement Benefit Plans – net-of-tax (1,638) 1,618 (1,896)
Total Other Comprehensive (Loss) Income (1,509) 1,487 (1,831)
Total Comprehensive Income $ 85,338 $ 83,832 $ 70,608