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 Plan Disclosure [Line Items]
Annual benefits paid to retired participants			$ 400
Pension Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Benfit plan, cash contributions	$ 500	$ 800	1,000	$ 1,300
Expected cash contributions	2,600		2,600
Other Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Benfit plan, cash contributions	200	$ 200	400	$ 400
Expected cash contributions	$ 1,000		$ 1,000