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Property and Equipment (Details) (USD $)	Jun. 30, 2012	Dec. 31, 2011
Property and Equipment [Abstract]
Accumulated depreciation	$ 192,872,000	$ 184,316,000

- Definition

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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