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Employee Benefit Plans (Benefit Obligations in Excess of the Fair Value of Plan Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Employee Pension Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Projected benefit obligation $ 105,942 $ 110,923 $ 95,178
Accumulated benefit obligation 105,942 110,923  
Fair value of plan assets 72,296 75,956 $ 72,617
Projected benefit obligation greater than fair value of plan assets 33,646 34,967  
Accumulated benefit obligation greater than fair value of plan assets 33,646 34,967  
Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Projected benefit obligation 102,495 107,570  
Accumulated benefit obligation 102,495 107,570  
Fair value of plan assets 72,296 75,956  
Projected benefit obligation greater than fair value of plan assets 30,199 31,614  
Accumulated benefit obligation greater than fair value of plan assets 30,199 31,614  
Benefit Equalization Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Projected benefit obligation 3,447 3,353  
Accumulated benefit obligation 3,447 3,353  
Projected benefit obligation greater than fair value of plan assets 3,447 3,353  
Accumulated benefit obligation greater than fair value of plan assets $ 3,447 $ 3,353