XML 73 R37.htm IDEA: XBRL DOCUMENT v3.19.3
Debt and Credit Agreements - Narrative (Details)
9 Months Ended
Apr. 22, 2019
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]      
Debt issuance costs   $ 4,210,000 $ 4,896,000
Unamortized costs   $ 3,400,000  
Revolving credit facility      
Debt Instrument [Line Items]      
Borrowing base $ 3,200,000,000    
Remaining borrowing capacity $ 1,500,000,000    
Minimum asset coverage ratio   1.75  
Minimum annual coverage ratio, consolidated cash flow to interest expense   2.8  
Minimum current ratio   1.0  
Long-term Debt, Gross   $ 0 $ 7,000,000
Line of credit   1,500,000,000  
Debt issuance costs   $ 7,400,000  
Revolving credit facility | Minimum | Non Investment Grade      
Debt Instrument [Line Items]      
Commitment fee percent 0.30%    
Revolving credit facility | Minimum | Non Investment Grade | ABR Loans      
Debt Instrument [Line Items]      
Basis spread 0.50%    
Revolving credit facility | Minimum | Non Investment Grade | LIBOR Loans      
Debt Instrument [Line Items]      
Basis spread 1.50%    
Revolving credit facility | Minimum | Investment Grade      
Debt Instrument [Line Items]      
Commitment fee percent 0.125%    
Revolving credit facility | Minimum | Investment Grade | ABR Loans      
Debt Instrument [Line Items]      
Basis spread 0.125%    
Revolving credit facility | Minimum | Investment Grade | LIBOR Loans      
Debt Instrument [Line Items]      
Basis spread 1.125%    
Revolving credit facility | Maximum | Non Investment Grade      
Debt Instrument [Line Items]      
Commitment fee percent 0.425%    
Revolving credit facility | Maximum | Non Investment Grade | ABR Loans      
Debt Instrument [Line Items]      
Basis spread 1.25%    
Revolving credit facility | Maximum | Non Investment Grade | LIBOR Loans      
Debt Instrument [Line Items]      
Basis spread 2.25%    
Revolving credit facility | Maximum | Investment Grade      
Debt Instrument [Line Items]      
Commitment fee percent 0.275%    
Revolving credit facility | Maximum | Investment Grade | ABR Loans      
Debt Instrument [Line Items]      
Basis spread 0.75%    
Revolving credit facility | Maximum | Investment Grade | LIBOR Loans      
Debt Instrument [Line Items]      
Basis spread 1.75%