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Employee Benefit Plans (Defined Benefit Plans Disclosure) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 2,654 $ 2,580
Interest cost 1,330 1,198
Expected return on plan assets (1,554) (1,285)
Amortization of prior service cost 83 74
Amortization of prior actuarial loss 1,094 1,081
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement 0 257
Total 3,607 3,905
Other Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 636 721
Interest cost 530 565
Expected return on plan assets 0 0
Amortization of prior service cost (329) (156)
Amortization of prior actuarial loss 498 457
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement 0 0
Total $ 1,335 $ 1,587