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Employee Benefit Plans (Details 6) (USD $) In Thousands, unless otherwise specified									12 Months Ended
	Dec. 31, 2011 Level 3 Real estate funds / limited partnerships	Dec. 31, 2011 International Plans	Dec. 31, 2010 International Plans	Dec. 31, 2009 International Plans	Dec. 31, 2011 International Plans Real estate funds / limited partnerships	Dec. 31, 2010 International Plans Real estate funds / limited partnerships	Dec. 31, 2011 International Plans Level 3	Dec. 31, 2010 International Plans Level 3	Dec. 31, 2011 International Plans Level 3 Real estate funds / limited partnerships	Dec. 31, 2010 International Plans Level 3 Real estate funds / limited partnerships
Changes in fair value of level 3 assets
Fair value at the beginning of the period	$ 12,025	$ 714,163	$ 708,025	$ 679,018	$ 43,122	$ 40,173	$ 12,025	$ 10,184	$ 10,184	$ 10,994
Actual return on plan assets: Relating to assets still held at year-end									1,841	(810)
Fair value at the end of the period	$ 12,025	$ 714,163	$ 708,025	$ 679,018	$ 43,122	$ 40,173	$ 12,025	$ 10,184	$ 12,025	$ 10,184

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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