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Pension Plan (Schedule of Pension Plan Expenses) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Pension Plan [Abstract]        
Current service cost, net of employee contributions $ 12 $ 7 $ 41 $ 27
Interest cost on accrued benefit obligation 27 32 81 97
Expected return on plan assets (42) (45) (127) (131)
Amortization of transitional obligation 3 3 8 9
Amortization of past service costs 2 2 5 6
Amortization of net actuarial gain 9 8 29 25
Total cost of benefit $ 11 $ 7 $ 37 $ 33