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Employee Benefits Plans (Details 7) (Level 3 [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Level 3 [Member]
Summary of changes in fair value of the pension plans' level 3 assets
Fair value of plan assets at January 1	$ 68,543	$ 17,745
Return on plan assets:
Relating to assets still held at the reporting date	(551)	(2,277)
Relating to assets sold during the period	5,990	3,051
Purchases, sales, settlements and expenses	(2,775)	50,024
Fair value of plan assets at December 31	$ 71,207	$ 68,543

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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