Quarterly report pursuant to Section 13 or 15(d)

Borrowings (Credit Facility) (Narrative) (Details)

v3.19.3
Borrowings (Credit Facility) (Narrative) (Details)
9 Months Ended
Sep. 30, 2019
USD ($)
May 01, 2019
USD ($)
Dec. 31, 2018
USD ($)
May 25, 2017
USD ($)
lender
Line of Credit Facility [Line Items]        
Balance outstanding on credit facility $ 200,000,000   $ 200,000,000  
Senior secured revolving credit facility | Secured debt        
Line of Credit Facility [Line Items]        
Institutional lenders | lender       17
Maximum borrowing capacity       $ 2,000,000,000
Credit facility borrowing base 1,100,000,000 $ 1,100,000,000    
Increase limit 850,000,000      
Balance outstanding on credit facility 200,000,000      
Letters of credit outstanding $ 17,675,000      
Interest rate at period end (as a percent) 3.55%      
Unused capacity, commitment fee (as a percent) 0.375%      
Senior secured revolving credit facility | Secured debt | Minimum        
Line of Credit Facility [Line Items]        
Debt instrument interest rate (as a percent) 1.25%      
Senior secured revolving credit facility | Secured debt | Maximum        
Line of Credit Facility [Line Items]        
Debt instrument interest rate (as a percent) 2.25%