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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Retirement benefit adjustments, taxes	$ (43,172)	$ 2,599	$ 35,912
Accumulated Other Comprehensive Income (Loss) [Member]
Retirement benefit adjustments, taxes	$ (43,172)	$ 2,599	$ 35,912

Tax effects of the increase (decrease) to accumulated comprehensive income during the period related to benefit plans. While for technical reasons this element has no balance attribute, the default assumption is a credit balance consistent with its label.

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