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Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Net (loss) gain arising during the period, tax benefit (provision)	$ 15,830	$ (11,188)	$ 4,312
Prior service credit arising during the period, tax provision	(1,163)	(71)
Amortization of actuarial loss included in net periodic cost, tax provision	(3,513)	(4,194)	(4,053)
Amortization of prior service credit included in net periodic cost, tax benefit	$ 252	$ 230	$ 260

X

- Definition

Tax effect on the accumulated change in the value of either the projected benefit obligation or plan assets resulting from experience different from that assumed or from a change in an actuarial assumption that has not been recognized in net periodic benefit cost.

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Tax effect of plan amendments during the period. The expense (benefit) has not been recognized in net periodic benefit cost.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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