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Retirement and Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Net periodic benefit cost [Abstract]
Net periodic benefit expense	$ 460	$ 449
Pension contributions [Abstract]
Pension contributions	469	517
Pension Plan [Member]
Net periodic benefit cost [Abstract]
Service cost	161	205
Interest cost	1,816	4,011
Expected return on plan assets	(1,474)	(4,588)
Amortization of actuarial (gain) loss	(43)	821
Net periodic benefit expense	460	$ 449
Pension contributions [Abstract]
Estimated remaining 2019 pension contributions	$ 1,400

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- Definition

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 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 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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