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Deferred Costs (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Deferred Costs    
Deferred financing $ 113,620 $ 86,256
Deferred leasing 238,394 200,633
Deferred costs, gross 352,014 286,889
Less accumulated amortization (141,228) (114,372)
Deferred costs, net $ 210,786 $ 172,517