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Commitments and Contingencies (Details 2) (Expiration Dates Through 2101 [Member], USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Expiration Dates Through 2101 [Member]
 
minimum lease payments for its operating leases  
2012 $ 4,366
2013 4,379
2014 4,455
2015 4,525
2016 4,581
2017 and thereafter 252,331
Total $ 274,637