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Employee Benefit Plans (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined contribution plan expense recognized	$ 372	$ 457	$ 743	$ 887
Pension Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expected total contributions for current fiscal year	0		0
Employer contributions	0	0	0	0
Postretirement Benefit Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employer contributions	158	$ 126	276	$ 351
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	$ 552		$ 552

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- Definition

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

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