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Consolidated Statements of Comprehensive Income (Not Audited) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Net Income $ 26,215 $ 19,585
Unrealized Gains on Available-for-Sale Securities:    
Reversal of Previously Recognized Gains on Available for Sale Securities Included in Other Income During Period (110)
Unrealized (Losses) Gains Arising During Period (66) 17
Income Tax Benefit (Expense) 37 (6)
Change in Unrealized Gains on Available-for-Sale Securities – net-of-tax (139) 11
Pension and Postretirement Benefit Plans:    
Amortization of Unrecognized Postretirement Benefit Losses and Costs (note 10) 227 157
Income Tax Expense (59) (63)
Adjustment to Income Tax Expense Related to 2017 Tax Cuts and Jobs Act (531)
Pension and Postretirement Benefit Plans – net-of-tax (363) 94
Total Other Comprehensive (Loss) Income (502) 105
Total Comprehensive Income $ 25,713 $ 19,690