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Employee Benefit Plans (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined contribution plan expense recognized	$ 329	$ 243	$ 1,216	$ 1,180
Pension Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employer contributions	0	0	0	0
Expected total contributions for current fiscal year	0		0
Postretirement Benefit Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employer contributions	74	$ 122	426	$ 389
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	$ 570		$ 570

X

- Definition

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

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