Pension Benefits (Details) - USD ($)		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Defined Benefit Plan, service cost		$ 4,455,000	$ 4,516,000	$ 5,582,000
Defined Benefit Plan, interest cost		2,089,000	2,358,000	2,791,000
Defined Benefit Plan, actuarial loss		1,914,000	7,483,000
Defined Benefit Plan, benefits paid		(4,630,000)	(905,000)
Defined Benefit Plan, settlements		(1,661,000)	(10,702,000)
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, fair value of plan assets at beginning of year		32,894,000	35,634,000
Defined Benefit Plan, actual return on plan assets		2,777,000	2,837,000
Defined Benefit Plan, employer contribution		6,561,000	6,030,000	7,200,000
Defined Benefit Plan, benefits paid excluding settlements		4,630,000	905,000
Defined Benefit Plan, Plan Assets, Payment for Settlement		1,661,000	10,702,000
Defined Benefit Plan, fair value of plan assets at end of year		35,941,000	32,894,000	35,634,000
Defined Benefit Plan, funded status at end of year		(39,819,000)	(40,699,000)
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Abstract]
Defined Benefit Plan, projected benefit obligation		75,760,000	73,593,000	70,843,000
Defined Benefit Plan, accumulated benefit obligation		64,325,000	63,934,000
Defined Benefit Plan, underfunded accumulated benefit obligation		$ 28,384,000	31,040,000
Defined Benefit Plan, unrecognized net gain (loss) amortization threshold		10.00%
Pre-tax Amounts Recognized in Accumulated Other Comprehensive Income [Abstract]
Defined Benefit Plan, unrecognized actuarial losses		$ 16,388,000	17,328,000
Defined Benefit Plan, unrecognized prior service costs		0	14,000
Defined Benefit Plan, accumulated other comprehensive loss		16,388,000	17,342,000
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Other Comprehensive Income (Loss), Defined Benefit Plan, net actuarial gain (loss)		(612,000)	(6,381,000)	377,000
Other Comprehensive Income (Loss), Defined Benefit Plan, amortization of prior service cost		13,000	17,000	17,000
Other Comprehensive Income (Loss), Defined Benefit Plan, amortization of net actuarial loss		1,240,000	950,000	958,000
Other Comprehensive Income (Loss), Defined Benefit Plan, settlements		312,000	2,509,000	0
Other Comprehensive Income (Loss), Defined Benefit Plan, total pension liability adjustment, pre-tax		953,000	(2,905,000)	1,352,000
Other Comprehensive Income (Loss), Defined Benefit Plan, tax (expense) benefit		(204,000)	626,000	(291,000)
Other Comprehensive Income (Loss), Defined Benefit Plan, total pension liability adjustment, net	[1]	749,000	(2,279,000)	1,061,000
Components of Net Periodic Benefit Costs for Both Pension Plans
Defined Benefit Plan, service cost		4,455,000	4,516,000	5,582,000
Defined Benefit Plan, interest cost		2,089,000	2,358,000	2,791,000
Defined Benefit Plan, expected return on plan assets that reduces periodic pension benefit cost		(1,474,000)	(1,735,000)	(1,574,000)
Defined Benefit Plan, amortization of prior service cost		13,000	17,000	17,000
Defined Benefit Plan, amortization of net actuarial loss		1,240,000	950,000	958,000
Defined Benefit Plan, net periodic benefit cost		6,323,000	6,106,000	7,774,000
Defined Benefit Plan, settlements		312,000	2,509,000	0
Defined Benefit Plan, Total Net Benefit Cost		$ 6,635,000	$ 8,615,000	$ 7,774,000
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation and Net Periodic Benefit Cost [Abstract]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, discount rate		3.10%	2.90%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, rate of compensation increase		3.60%	4.40%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, discount rate		2.90%	3.60%	4.40%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, expected return on plan assets		4.40%	5.30%	5.00%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, rate of compensation increase		4.40%	4.50%	6.20%
Defined Benefit Plan, Expected Future Employer Contributions [Abstract]
Defined Benefit Plan, Expected Future Contributions in Next Fiscal Year		$ 6,000,000
Future Benefit Payments
Defined Benefit Plan, Expected Future Benefit Payments in Year One		4,200,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Two		5,066,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Three		4,404,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Four		4,879,000
Defined Benefit Plan, Expected Future Benefit Payments in Year Five		6,834,000
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter		$ 27,197,000
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		100.00%
Defined Benefit Plan, Plan Assets, Benefits Paid		$ (6,300,000)	$ (11,600,000)	$ (5,700,000)
Nonqualified Plan
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, fair value of plan assets at beginning of year		0	0
Defined Benefit Plan, fair value of plan assets at end of year		$ 0	$ 0	$ 0
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation and Net Periodic Benefit Cost [Abstract]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, expected return on plan assets		0.00%	0.00%	0.00%
Defined Benefit Plan, Equity Securities
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, fair value of plan assets at beginning of year		$ 12,159,000
Defined Benefit Plan, fair value of plan assets at end of year		$ 13,998,000	$ 12,159,000
Future Benefit Payments
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		37.00%
Fixed Income Securities
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, fair value of plan assets at beginning of year		$ 8,202,000
Defined Benefit Plan, fair value of plan assets at end of year		$ 10,042,000	8,202,000
Future Benefit Payments
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		38.00%
Other Securities
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, fair value of plan assets at beginning of year		$ 12,533,000
Defined Benefit Plan, fair value of plan assets at end of year		$ 11,901,000	$ 12,533,000
Future Benefit Payments
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		25.00%

[1] Please refer to Note 11 – Pension Benefits for additional discussion of the pension liability adjustment.