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Employee Benefit Plans (Schedule of Net Pension Costs) (Details) - Pension Plan [Member] - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Service cost - benefits earned during the period
Interest cost on projected benefit obligation $ 1,364 $ 1,461 $ 1,284
Expected return on plan assets $ (2,847) $ (2,779) (2,307)
Net amortization and deferral 49
Net periodic pension (income) cost $ (1,483) $ (1,318) $ (974)