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Pension Plan (Schedule of Pension Plan Expenses) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]        
Current service cost, net of employee contributions $ 12 $ 14 $ 23 $ 29
Interest cost on accrued benefit obligation 26 27 50 55
Expected return on plan assets (41) (44) (80) (85)
Amortization of transitional obligation 3 3 5 5
Amortization of past service costs 3 2 5 4
Amortization of net actuarial gain 10 9 18 19
Total cost of benefit $ 13 $ 11 $ 21 $ 27