Employee Retirement Plans (Schedule of Defined Benefit Plan, Amounts Recognized in Consolidated Financial Statements) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]
Accrued pension liability: Current portion	$ (360)	$ (372)	$ (395)
Accrued pension liability: Long term portion	(1,016)	(1,313)	(1,566)
Pre-tax accumulated other comprehensive income – retirement benefit liability adjustment	197	208	155
Net amount recognized	$ (1,573)	$ (1,893)	$ (2,116)