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Debt Obligations and Credit Facilities - EGL Revolving Credit Facility (Details)
2 Months Ended 12 Months Ended
Aug. 16, 2018
USD ($)
Feb. 21, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]          
Repayment of loans     $ (742,574,000) $ (914,319,000) $ (912,140,000)
Loan facilities          
Debt Instrument [Line Items]          
Repayment of loans     $ (742,600,000)    
Loan facilities | EGL Revolving Credit Facility          
Debt Instrument [Line Items]          
Facility term 5 years   5 years    
Maximum borrowing capacity $ 600,000,000.0   $ 600,000,000.0    
Increase in borrowing capacity, limit $ 400,000,000.0        
Available unutilized capacity     $ 600,000,000.0    
Covenant compliance, consolidated indebtedness to total capitalization (not greater than) 0.35        
Covenant compliance, net income (loss) threshold $ 2,300,000,000        
Covenant compliance, net income threshold percent 50.00%        
Covenant compliance, percentage of proceeds of common stock issuance 50.00%        
Subsequent Event | Loan facilities | EGL Revolving Credit Facility          
Debt Instrument [Line Items]          
Available unutilized capacity   $ 595,000,000.0      
Repayment of loans   $ (5,000,000.0)