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Pension and Postretirement Plans (Details 8) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial loss recognition	$ 6,281
Prior service cost recognition	3,695
Supplemental Executive Retirement Plan (SERP) [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial loss recognition	2,298
Prior service cost recognition	54
Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial loss recognition	(1,479)
Prior service cost recognition	$ (5,607)

The amounts in accumulated other comprehensive income related to gains and losses that are not recognized immediately and are expected to be recognized as components of net periodic benefit cost over the next fiscal year that follows the most recent annual statement of financial position presented.

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- Definition

The amounts in accumulated other comprehensive income related to prior service cost or credit expected to be recognized as components of net periodic benefit cost over the next fiscal year that follows the most recent annual statement of financial position presented.

+ References+ Details