Employee Benefit Plans (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Annual benefits paid to retired participants	$ 300
Pension Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Benfit plan, cash contributions	500	$ 500
Expected cash contributions	2,800
Other Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Benfit plan, cash contributions	200	$ 200
Expected cash contributions	$ 1,400