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Pension Plan (Schedule of Pension Plan Expenses) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Pension Plan [Abstract]        
Current service cost, net of employee contributions $ 14 $ 9 $ 29 $ 20
Interest cost on accrued benefit obligation 27 32 55 64
Expected return on plan assets (44) (44) (85) (86)
Amortization of transitional obligation 3 3 5 6
Amortization of past service costs 2 2 4 4
Amortization of net actuarial gain 9 8 19 17
Total cost of benefit $ 11 $ 10 $ 27 $ 25