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Employee Benefit Plans (Defined Benefit Plans Disclosure) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 2,652 $ 2,586 $ 4,958 $ 4,616
Interest cost 1,076 1,283 2,335 2,526
Expected return on plan assets (1,345) (1,331) (2,569) (2,449)
Amortization of prior service cost 75 80 153 163
Amortization of prior actuarial loss 1,224 833 2,081 1,272
Total 3,682 3,451 6,958 6,128
Other Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1,015 589 2,031 1,178
Interest cost 643 491 1,286 982
Expected return on plan assets 0 0 0 0
Amortization of prior service cost 0 0 0 0
Amortization of prior actuarial loss 617 265 1,233 530
Total $ 2,275 $ 1,345 $ 4,550 $ 2,690