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Retirement Plans (Amounts In AOCI Not Yet Recognized as Net Periodic Benefit Costs) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Pension Benefits [Member]
Defined Benefit Plan [Abstract]
Net actuarial loss	$ 531,958	$ 411,076
Prior service cost/(credit)	310	356
Total	532,268	411,432
Postretirement Benefits Other Than Pensions (OPEB) [Member]
Defined Benefit Plan [Abstract]
Net actuarial loss	143,070	30,835
Prior service cost/(credit)	(24,320)	(25,605)
Total	$ 118,750	$ 5,230

The total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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