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Employee Benefit Plans (Pension And Other Postretirement Benefit Costs) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Pension Plans, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 0 $ 1 $ 0 $ 5
Interest cost 3,197 3,695 6,535 7,265
Expected return on plan assets (4,444) (4,466) (8,982) (10,231)
Curtailments 454 0 454 0
Amortization of other actuarial losses (gains) 924 3,185 1,681 5,243
Net benefit cost (credit) 131 2,415 (312) 2,282
Other Postretirement Benefit Plans, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 105 200 265 433
Interest cost 1,138 308 2,272 643
Curtailments (970) 0 (970) 0
Amortization of prior service credits (2,672) (2,083) (5,345) (4,167)
Amortization of other actuarial losses (gains) (566) (599) (1,132) (1,055)
Net benefit cost (credit) $ (2,965) $ (2,174) $ (4,910) $ (4,146)