Employee Benefit Plans Unrecognized loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	$ 65,091
Unrecognized gains arising in current year	7,144	$ (2,532)	$ (937)
Ending Balance	27,411	65,091
Unrecognized Pension and Postretirement Plan Income (Costs)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	(16,513)	(15,001)	(15,089)
Ending Balance	(8,213)	(16,513)	(15,001)
Pension Plans | Unrecognized Net Loss
Before tax
Beginning balance	25,474	23,546
Reclass adjustment for postretirement plan gain included in net income	(2,017)	(1,859)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax	(9,899)	3,787
Ending balance	13,558	25,474	23,546
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	19,843	18,337
Recognized component of periodic pension cost	(1,574)	(1,452)
Unrecognized gains arising in current year	(7,724)	2,958
Ending Balance	10,545	19,843	18,337
Other Postretirement Benefit Plans | Unrecognized Prior Service Cost
Before tax
Beginning balance	(3,012)	(3,476)
Reclass adjustment for postretirement plan gain included in net income	464	464
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax	0	0
Ending balance	(2,548)	(3,012)	(3,476)
Other Postretirement Benefit Plans | Unrecognized Net Loss
Before tax
Beginning balance	(858)	(948)
Reclass adjustment for postretirement plan gain included in net income	72	84
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax	57	6
Ending balance	(729)	(858)	(948)
Other Postretirement Benefit Plans | Unrecognized Pension and Postretirement Plan Income (Costs)
Before tax
Beginning balance	(3,870)	(4,424)
Reclass adjustment for postretirement plan gain included in net income	536	548
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax	57	6
Ending balance	(3,277)	(3,870)	(4,424)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	(3,018)	(3,451)
Recognized component of periodic pension cost	418	428
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Prior to Curtailment, Net of Tax		5
Unrecognized gains arising in current year	44
Ending Balance	$ (2,556)	$ (3,018)	$ (3,451)