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Significant Accounting Policies (Details 2)	12 Months Ended
	Dec. 31, 2011 Y
Commercial buildings
Real Estate and Depreciation
Estimated useful life (in years)	39
Building improvements
Real Estate and Depreciation
Minimum estimated useful life (in years)	15
Maximum estimated useful life (in years)	39
Fixtures and equipment
Real Estate and Depreciation
Minimum estimated useful life (in years)	3
Maximum estimated useful life (in years)	7

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- Definition

The average useful life of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

+ References

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- Definition

The maximum useful life of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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- Definition

The minimum useful life of long lived, physical assets used in the normal conduct of business and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

+ References

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