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Employee Benefit Plans (Schedule of Projected Benefit Obligation) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Projected benefit obligation:    
Balance, January 1 $ 85,551 $ 78,369
Service cost 3,733 3,559
Interest cost 3,621 3,505
Actuarial (gain) loss 7,916 2,003
Benefits paid (2,031) (1,885)
Balance, December 31 98,790 85,551
Plan assets:    
Fair value, January 1 73,168 71,174
Actual return 10,290 3,879
Employer contribution
Benefits paid (2,031) (1,885)
Fair value, December 31 81,427 73,168
Funded status:    
Accrued pension liability $ (17,363) $ (12,383)