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Pension Plan (Schedule of Pension Plan Expenses) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]    
Current service cost, net of employee contributions $ 11 $ 15
Interest cost on accrued benefit obligation 24 27
Expected return on plan assets (39) (41)
Amortization of transitional obligation 2 3
Amortization of past service costs 2 2
Amortization of net actuarial gain 8 10
Total cost of benefit $ 8 $ 16