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Consolidated Statements of Income (Loss) and Comprehensive Income (Loss) (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Consolidated Statements of Income (Loss) and Comprehensive Income (Loss) [Abstract]
Actuarial loss recognized in change of projected benefit obligation	$ 0	$ 0	$ 0

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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