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Retirement Plans Amounts Recognized in Accumulated Other Comprehensive Income Table (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Prior service cost	$ 153	$ 188
Net actuarial (gain) loss	23,124	12,894
Amount not yet recognized in net periodic benefit cost, but recognized in accumulated other comprehensive income	23,277	13,082
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Prior service cost	0	0
Net actuarial (gain) loss	84	(235)
Amount not yet recognized in net periodic benefit cost, but recognized in accumulated other comprehensive income	$ 84	$ (235)

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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