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Retirement and Benefit Plans (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Apr. 25, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Net periodic benefit cost [Abstract]
Net periodic benefit expense				$ 911	$ 13,026
Pension contributions [Abstract]
Pension contributions				927	1,042
Pension Plan [Member]
Net periodic benefit cost [Abstract]
Service cost		$ 161	$ 198	322	403
Interest cost		1,809	3,312	3,625	7,323
Expected return on plan assets		(1,475)	(3,292)	(2,949)	(7,880)
Amortization of actuarial (gain) loss		(44)	356	(87)	1,177
Plan settlement loss		0	12,003	0	12,003
Net periodic benefit expense		451	$ 12,577	911	$ 13,026
Pension contributions [Abstract]
Pension contributions				900
Estimated remaining 2019 pension contributions		$ 900		$ 900
Group annuity transactions	$ 151,800
Percentage of defined benefit plan assets transferred out of the plan	33.00%

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Percentage of defined benefit plan assets transferred out of the 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 expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.

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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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