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Employee Benefit Plans (Components of Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Pension Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Interest cost	$ 466	$ 428	$ 1,398	$ 1,283
Expected return on plan assets	(555)	(711)	(1,665)	(2,133)
Amortization of unrecognized net (gain) loss	138	112	412	338
Total net periodic benefit cost	49	(171)	145	(512)
Postretirement Benefit Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	5	8	15	24
Interest cost	46	46	136	138
Amortization of prior service cost	4	4	11	12
Amortization of unrecognized net (gain) loss	(98)	(70)	(292)	(210)
Total net periodic benefit cost	$ (43)	$ (12)	$ (130)	$ (36)

X

- Definition

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

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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 cost recognized for passage of time related to defined benefit plan.

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Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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