Benefit Plan Schedule of balances of AOCI (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan [Abstract]
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Tax	$ 168	$ 0
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax	33,933	37,560
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax	(33,765)	(37,560)
Deferred Tax Assets, Tax Deferred Expense, Other	7,091	7,888
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax	$ (26,674)	$ (29,672)