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Commitments and Contingencies - Litigation Narrative (Details)
1 Months Ended 12 Months Ended
Sep. 06, 2019
USD ($)
lawsuit
Feb. 05, 2019
USD ($)
Jun. 07, 2018
USD ($)
Sep. 08, 2016
plaintiff
Oct. 26, 2018
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2019
USD ($)
lawsuit
Nov. 18, 2019
USD ($)
Jan. 20, 2015
lawsuit
SDNY Actions [Member]                  
Loss Contingencies [Line Items]                  
Litigation amount awarded to other party             $ 1,025,000,000.000    
SDNY Actions [Member] | Pending Litigation [Member]                  
Loss Contingencies [Line Items]                  
Number of claims | lawsuit                 10
Opt-Out Actions [Member]                  
Loss Contingencies [Line Items]                  
Number of claims | lawsuit 2           13    
Twelve Opt-Out Actions [Member]                  
Loss Contingencies [Line Items]                  
Litigation settlement payment         $ 127,500,000        
Holdings as a percent of total pending shareholder actions         18.00%        
Vanguard Action [Member]                  
Loss Contingencies [Line Items]                  
Litigation settlement payment     $ 90,000,000.0            
Holdings as a percent of total pending shareholder actions     13.00%            
Series of Individual Agreements [Member]                  
Loss Contingencies [Line Items]                  
Litigation settlement payment   $ 27,900,000              
Jet Capital Action [Member]                  
Loss Contingencies [Line Items]                  
Litigation settlement payment $ 27,000,000.0                
Putative Class Action [Member] | Pending Litigation [Member]                  
Loss Contingencies [Line Items]                  
Stipulation of settlement, maximum attorney fees           $ 625,000      
Audit Committee Investigation [Member]                  
Loss Contingencies [Line Items]                  
Civil penalty payment               $ 8,000,000.0  
Audit Committee Investigation [Member] | SDNY Actions [Member]                  
Loss Contingencies [Line Items]                  
Number of individuals in civil complaint | plaintiff       2          
Former Manager [Member] | SDNY Actions [Member]                  
Loss Contingencies [Line Items]                  
Litigation amount awarded to other party             $ 225,000,000.0    
Litigation settlement payment             32,000,000.0    
Former CFO [Member] | SDNY Actions [Member]                  
Loss Contingencies [Line Items]                  
Litigation amount awarded to other party             12,500,000    
Former Auditor [Member] | SDNY Actions [Member]                  
Loss Contingencies [Line Items]                  
Litigation amount awarded to other party             49,000,000.0    
VEREIT [Member] | SDNY Actions [Member]                  
Loss Contingencies [Line Items]                  
Litigation amount awarded to other party             $ 738,500,000