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Employee Benefit Plans (Schedule of Projected Benefit Obligation) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Projected benefit obligation:    
Balance, January 1 $ 98,790 $ 85,551
Service cost 4,017 3,733
Interest cost 3,703 3,621
Actuarial (gain) loss (7,768) 7,916
Benefits paid (2,341) (2,031)
Balance, December 31 96,401 98,790
Plan assets:    
Fair value, January 1 81,427 73,168
Actual return (4,506) 10,290
Employer contribution
Benefits paid (2,341) (2,031)
Fair value, December 31 74,580 81,427
Funded status:    
Accrued pension liability $ (21,821) $ (17,363)