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Employee Benefit Plans (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined contribution plan expense recognized	$ 371	$ 430
Pension Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expected total contributions for current fiscal year	0
Employer contributions	0	0
Postretirement Benefit Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employer contributions	118	$ 225
Postretirement Benefit Plan [Member] | Salaried Retirees [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expected total contributions for current fiscal year	$ 472

X

- Definition

Amount of contribution received by defined benefit plan from employer which increases plan assets.

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