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Deferred Costs (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Deferred Costs    
Deferred financing $ 148,662 $ 152,596
Deferred leasing 289,678 285,931
Deferred costs, gross 438,340 438,527
Less accumulated amortization (186,322) (177,382)
Deferred costs, net $ 252,018 $ 261,145