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Retirement and Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Net periodic benefit cost [Abstract]
Net periodic benefit expense	$ 555	$ 460
Pension contributions [Abstract]
Pension contributions	726	469
Pension Plan [Member]
Net periodic benefit cost [Abstract]
Service cost	168	161
Interest cost	1,473	1,816
Expected return on plan assets	(1,374)	(1,474)
Amortization of actuarial (gain) loss	202	(43)
Plan settlement loss	86	0
Net periodic benefit expense	555	$ 460
Pension contributions [Abstract]
Pension contributions	700
Estimated remaining 2020 pension contributions	$ 1,000

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Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.

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Amount of contributions expected to be received by defined benefit plan from employer in fiscal year. Excludes contributions paid by employer in current fiscal year.

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Amount of cash outflow for pension benefit. Includes, but is not limited to, employer contribution to fund plan asset and payment to retiree. Excludes other postretirement benefit.

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