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Commitments and Contingencies (Tables)	12 Months Ended
Commitments and Contingencies (Tables)	Dec. 31, 2011
Commitments and Contingencies [Abstract]
Schedule of Future Minimum Rental Payments for Capital Leases and Operating Leases	s. The following table summarizes the approximate future minimum rentals under non-cancelable operating leases, including renewals that are reasonably assured, and future minimum capital lease payments in effect at December 31, 2011 (in thousands):