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Employee Benefit Plans (Schedule of Plan's Pension Cost) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Service cost benefits earned during the year $ 3,795 $ 3,003  
Interest cost on projected benefit obligations 3,178 3,037  
Defined Benefit Plan [Member]      
Service cost benefits earned during the year 3,796 3,003 $ 3,452
Interest cost on projected benefit obligations 3,178 3,037 2,819
Expected return on plan assets (4,864) (4,711) (4,469)
Net amortization and deferral 1,542 244 1,729
Net periodic pension cost $ 3,652 $ 1,573 $ 3,531