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Basis of Presentation and Significant Accounting Policies Principles of Consolidation and VIEs (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 19, 2017
Nov. 15, 2017
Nov. 12, 2015
Apr. 14, 2015
Dec. 31, 2016
Jun. 30, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Proceeds from Sale of Real Estate             $ 144,000 $ 506,000 $ 5,000
Gain (Loss) on Sale of Properties         $ 1,000 $ (1,000) $ 28,533 $ 213,086 $ (97)
Fort Lauderdale, FL Property                  
Proceeds from Sale of Real Estate $ 21,000                
Gain (Loss) on Sale of Properties 6,000                
Gain (Loss) on Sale of Properties, portion attributable to noncontrolling interest $ 100                
Costa Mesa, CA Property                  
Proceeds from Sale of Real Estate   $ 62,000              
Gain (Loss) on Sale of Properties   22,000              
Gain (Loss) on Sale of Properties, portion attributable to noncontrolling interest   $ 3,000              
Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member] | Florida LLC                  
Fair Value of Land Contributed       $ 15,000          
Carrying Value of Land Contributed       $ 10,000          
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage       92.00%          
Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member] | California LLC                  
Fair Value of Land Contributed     $ 39,000            
Carrying Value of Land Contributed     $ 35,000            
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage     90.00%            
Minimum                  
Ownership in equity method investment, percent             20.00%    
Maximum                  
Ownership in equity method investment, percent             50.00%