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Employee Benefit Plans (Fair Value of Plan Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 66,307 $ 74,932
Fair Value, Inputs, Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 24,002 44,617
Fair Value Measured at Net Asset Value Per Share [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 42,305 30,315
Common Stock [Member] | Fair Value, Inputs, Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 6,362 36,643
Fixed Income Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 17,640 7,974
Money Market Funds [Member] | Fair Value Measured at Net Asset Value Per Share [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 1,385 1,517
Mututal Funds [Member] | Fair Value Measured at Net Asset Value Per Share [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 40,920 $ 28,798