Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Intangible Assets (Details Textual)

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Goodwill and Intangible Assets (Details Textual) (Lease agreements [Member], USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Lease agreements [Member]
   
Goodwill and Intangible Assets (Textual) [Abstract]    
Definite life intangibles related to lease agreements $ 10.7 $ 11.4