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Retirement and Benefit Plans (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) Integer7	Jun. 30, 2019 USD ($)
Net periodic benefit cost [Abstract]
Net periodic benefit expense			$ 1,023	$ 911
Pension contributions [Abstract]
Pension contributions			$ 1,062	927
Number of Repurchased Real Property | Integer7			2
Pension Plan [Member]
Net periodic benefit cost [Abstract]
Service cost	$ 166	$ 161	$ 334	322
Interest cost	1,473	1,809	2,946	3,625
Expected return on plan assets	(1,372)	(1,475)	(2,746)	(2,949)
Amortization of actuarial (gain) loss	201	(44)	403	(87)
Plan settlement loss	0	0	86	0
Net periodic benefit expense	468	$ 451	1,023	$ 911
Pension contributions [Abstract]
Pension contributions			1,100
Estimated remaining 2020 pension contributions	$ 13,000		$ 13,000

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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 gain (loss) recognized in net periodic benefit (cost) credit from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk related to obligation and assets used to effect settlement.

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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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