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Employee Benefit Plans (Schedule of Employee Benefit Plans Recognized in Balance Sheet) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Noncurrent Liability $ 30,661 $ 36,686
Pension Benefit Plan [Member]    
Current Liability 347 374
Noncurrent Liability 16,809 18,424
Net Liability Recognized 17,156 18,798
Other Benefits Plan [Member]    
Current Liability
Noncurrent Liability 13,852 18,262
Net Liability Recognized $ 13,852 $ 18,262