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Commitments and Contingencies (Schedule of lease payments receivable) (Details) (USD $)	Dec. 31, 2012
Commitments and Contingencies Disclosure [Abstract]
2013	$ 11,131,765
2014	8,580,441
2015	6,492,595
2016	3,854,614
2017	2,778,214
Thereafter	5,046,475
Total	$ 37,884,104

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Future minimum rental payments in aggregate as of the balance sheet date under operating leases.

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Future rental payments receivable within one year of the balance sheet date under an operating lease.

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