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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net Income	$ 30,329	$ 24,268
Unrealized Gain (Loss) on Available-for-Sale Securities:
Reversal of Previously Recognized Losses (Gains) Realized on Sale of Investments and Included in Other Income (Expense) During Period	(5)	2
Unrealized Gains (Losses) Arising During Period	(40)	126
Income Tax (Expense) Benefit	10	(27)
Available-for-Sale Securities, net of tax	(35)	101
Pension and Postretirement Benefit Plans:
Amortization of Unrecognized Postretirement Benefit Losses and Costs	203	138
Income Tax Expense	(53)	(36)
Pension and Postretirement Benefit Plan, net of tax	150	102
Total Other Comprehensive Income	115	203
Total Comprehensive Income	$ 30,444	$ 24,471

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