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Supplemental Cash Flow Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Supplemental cash flow information:    
Interest paid, net of capitalized interest $ 152,423 $ 154,127
Income taxes paid 629 75
Capitalized interest 3,125 4,111
Supplemental schedule of non-cash investing activities:    
Accrued construction costs 21,715 15,029
Supplemental schedule of non-cash financing activities:    
Vesting of restricted stock units 411 17
Cancellation of restricted stock (1) (6)
Conversion of non-managing member units into common stock 73 2,179
Noncontrolling interest issued in connection with real estate acquisition 1,152  
Noncontrolling interest issued in connection with real estate disposition 1,671  
Mortgages and other liabilities assumed with real estate acquisitions 1 12,728
Unrealized gains (losses) on available-for-sale securities and derivatives designated as cash flow hedges, net $ (692) $ 6,675