Employee Retirement Plans (Schedule of Funded Status) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation at	$ 1,685	$ 1,961	$ 2,179
Interest cost	59	66	88
Actuarial losses (gains)	5	(39)	9
Benefits paid	(372)	(303)	(315)
Projected benefit obligation at	1,377	1,685	1,961
Fair value of plan assets	0	0	0
Under funded status	(1,377)	(1,685)	(1,961)
Unamortized prior service cost	4	10	24
Unrecognized actuarial gain	(200)	(218)	(179)
Net amount recognized	$ (1,573)	$ (1,893)	$ (2,116)