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Employee Benefit Plans (Benefit Obligations in Excess of the Fair Value of Plan Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Employee Pension Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Projected benefit obligation $ 103,681 $ 105,942 $ 110,923
Accumulated benefit obligation 103,681 105,942  
Fair value of plan's assets 66,057 72,296 $ 75,956
Projected benefit obligation greater than fair value of plan's assets 37,624 33,646  
Accumulated benefit obligation greater than fair value of plan's assets 37,624 33,646  
Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Projected benefit obligation 100,336 102,495  
Accumulated benefit obligation 100,336 102,495  
Fair value of plan's assets 66,057 72,296  
Projected benefit obligation greater than fair value of plan's assets 34,279 30,199  
Accumulated benefit obligation greater than fair value of plan's assets 34,279 30,199  
Benefit Equalization Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Projected benefit obligation 3,345 3,447  
Accumulated benefit obligation 3,345 3,447  
Projected benefit obligation greater than fair value of plan's assets 3,345 3,447  
Accumulated benefit obligation greater than fair value of plan's assets $ 3,345 $ 3,447