Intangible Assets (Details Textual)	6 Months Ended
	Jun. 30, 2012
Favorable lease agreements [Member] | Maximum [Member]
Intangible Assets (Textual) [Abstract]
Amortized over the lives of the leases term range	26 years
Favorable lease agreements [Member] | Minimum [Member]
Intangible Assets (Textual) [Abstract]
Amortized over the lives of the leases term range	4 years
Other intangibles [Member] | Maximum [Member]
Intangible Assets (Textual) [Abstract]
Amortized over the lives of the leases term range	11 years
Other intangibles [Member] | Minimum [Member]
Intangible Assets (Textual) [Abstract]
Amortized over the lives of the leases term range	1 year