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Other Assets (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Jan. 31, 2013
Components of other assets    
Lease procurement costs, net $ 130,628 $ 211,856
Prepaid expenses and other deferred costs, net 140,496 240,594
Intangible assets, net 81,438 85,692
Mortgage procurement costs, net 62,754 76,450
Other Assets $ 415,316 $ 614,592