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Basis of Financial Reporting - Narrative (Details) - USD ($)
$ in Thousands
Jan. 01, 2019
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Operating lease liabilities   $ 35,237    
Right of use assets   34,264    
Total assets deconsolidated   23,936,719 $ 25,220,968 $ 25,104,925
Total liabilities deconsolidated   $ 21,582,054 $ 22,906,189  
Accounting Standards Update 2016-02        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Operating lease liabilities $ 33,700      
Right of use assets 32,800      
Failed Sale-Leaseback Transaction | Accounting Standards Update 2016-02        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Total assets deconsolidated 43,800      
Total liabilities deconsolidated 34,800      
Reduction to noncontrolling interest $ 6,100