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Subsequent Events (Details) (USD $)
9 Months Ended 0 Months Ended 1 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Nov. 07, 2013
Subsequent event
Oct. 31, 2013
Mortgages [Member]
Mortgage for 220 East 42nd Street [Member]
Subsequent event
Subsequent Events          
Term         7 years
Face amount of mortgage         $ 275,000,000
Interest rate added to base rate (as a percent)         1.60%
Interest rate, description         30-day LIBOR
Common stock, shares issued (in shares) 95,780,000   94,896,000 2,600,000  
Common stock, par value (in dollars per share) $ 0.01   $ 0.01 $ 0.01  
Sales price of stock (usd per share)       $ 95.94  
Net proceeds from sale of common stock/preferred stock 41,758,000 423,544,000   249,400,000  
Payments of stock issuance costs       $ 5,700,000  
Shares authorized for sale to underwriter (shares)       390,000  
Shares authorized for sale to underwriter (usd per share)       $ 95.94