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Noncontrolling Interests Noncontrolling Interests—Property Partnerships Table (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Noncontrolling Interest [Line Items]      
Beginning Balance $ 1,683,760,000    
Capital contributions 46,701,000 $ 161,585,000 $ 11,951,000
Net income (loss) 62,909,000 47,832,000 (2,068,000)
Accumulated other comprehensive income (loss) 880,000 (1,922,000) (5,256,000)
Ending Balance 1,711,445,000 1,683,760,000  
Property Partnerships Member      
Noncontrolling Interest [Line Items]      
Beginning Balance 1,683,760,000 1,530,647,000 1,574,400,000
Capital contributions 46,701,000 161,585,000 [1] 10,756,000
Net income (loss) 62,909,000 47,832,000 (2,068,000)
Accumulated other comprehensive income (loss) 576,000 (2,128,000) (877,000)
Distributions (82,501,000) 54,176,000 51,564,000
Ending Balance 1,711,445,000 $ 1,683,760,000 $ 1,530,647,000
767 Fifth Avenue (the general motors building) [Member] | Property Partnerships Member      
Noncontrolling Interest [Line Items]      
Ending Balance $ 109,576    
[1] Includes the contribution of the remaining unpaid principal balance of the members’ notes payable totaling $109,576 to equity in the consolidated entity that owns 767 Fifth Avenue (the General Motors Building).