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Fair Value Measurements (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
May 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Fair Value of Financial Instruments            
Marketable securities   $ 30,208   $ 30,208   $ 28,638
Interest rate cap and swap agreements (included in other assets)   2,784   2,784   18,676
Purchase price and other fair value adjustments   3,799 $ (3,057) 69,389 $ 57,385  
Debt and preferred equity investments   1,954,556   1,954,556   2,099,393
Equity method investments   2,923,595   2,923,595   3,019,020
Additional amount of financing receivables included in other assets   89,800   89,800   88,800
Carrying Value            
Fair Value of Financial Instruments            
Debt and preferred equity investments   1,954,556   1,954,556   2,099,393
Fixed rate debt   3,538,829   3,538,829   3,543,476
Variable rate debt   2,353,927   2,353,927   2,048,442
Total   5,892,756   5,892,756   5,591,918
Fair Value            
Fair Value of Financial Instruments            
Marketable securities   30,208   30,208   28,638
Total   6,026,450   6,026,450   5,288,093
Estimated fair value of debt and preferred equity investments, low end of range   1,900,000   1,900,000   2,100,000
Estimated fair value of debt and preferred equity investments, high end of range   2,100,000   2,100,000   2,300,000
Level 1            
Fair Value of Financial Instruments            
Interest rate cap and swap agreements (included in other assets)   0   0   0
Level 2            
Fair Value of Financial Instruments            
Interest rate cap and swap agreements (included in other assets)   2,784   2,784   18,676
Level 3            
Fair Value of Financial Instruments            
Marketable securities   0   0   0
Interest rate cap and swap agreements (included in other assets)   0   0   0
Level 3 | Fair Value            
Fair Value of Financial Instruments            
Fixed rate debt   3,661,582   3,661,582   3,230,127
Variable rate debt   2,364,868   2,364,868   2,057,966
Equity marketable securities | Level 1            
Fair Value of Financial Instruments            
Marketable securities   0   0   0
Commercial mortgage-backed securities            
Fair Value of Financial Instruments            
Marketable securities   30,208   30,208   28,638
Commercial mortgage-backed securities | Level 2            
Fair Value of Financial Instruments            
Marketable securities   30,208   30,208   28,638
Joint venture            
Fair Value of Financial Instruments            
Equity method investments   2,923,595   2,923,595   3,019,020
919 Third Avenue | Joint venture | 919 Third Avenue            
Fair Value of Financial Instruments            
Purchase price and other fair value adjustments   49,300        
2 Herald Square            
Fair Value of Financial Instruments            
Business combination, fair value adjustment $ 8,100          
Accrued Interest Payable And Other            
Fair Value of Financial Instruments            
Interest rate cap and swap agreements (included in other liabilities)   37,208   37,208   7,663
Accrued Interest Payable And Other | Level 1            
Fair Value of Financial Instruments            
Interest rate cap and swap agreements (included in other liabilities)   0   0   0
Accrued Interest Payable And Other | Level 2            
Fair Value of Financial Instruments            
Interest rate cap and swap agreements (included in other liabilities)   37,208   37,208   7,663
Accrued Interest Payable And Other | Level 3            
Fair Value of Financial Instruments            
Interest rate cap and swap agreements (included in other liabilities)   $ 0   $ 0   $ 0
Mortgage And Jr Mortgage Loan With An Initial Maturity Date Of April 2017 | 2 Herald Square | Total fixed rate            
Fair Value of Financial Instruments            
Notes receivable 250,500          
Accrued interest $ 7,700