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Debt and Financing Obligations - Deferred Financing Fees, Supplemental Cash Flow (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
May 07, 2020
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Financing Obligations            
Unamortized fees   $ 15,900   $ 15,900   $ 18,000
Reduction in total aggregate commitment $ 130,000          
Amortization expenses   1,300 $ 1,200 2,567 $ 2,554  
Supplemental Cash Flow Information [Abstract]            
Net loss (gain) on sale and disposition of assets   (811) $ (1,128) (68) (575)  
Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations [Member] | Sale Leaseback Sites [Member]            
Financing Obligations            
Unamortized fees   700   700   700
Credit Agreement            
Financing Obligations            
Deferred financing fees capitalized 1,200          
Unamortized fees   6,600   6,600   7,800
Reduction in total aggregate commitment 130,000          
Write-off of a portion of the original issue discount and deferred financing fees $ 700          
Working Capital Facility [Member]            
Supplemental Cash Flow Information [Abstract]            
Borrowing from credit facility       680,100 881,700  
Payments on credit facility       (787,300) (778,900)  
Net borrowings from (payments on) credit facility       (107,200) 102,800  
Revolving Credit Facility [Member]            
Supplemental Cash Flow Information [Abstract]            
Borrowing from credit facility       50,000    
Payments on credit facility       (54,700) (8,000)  
Net borrowings from (payments on) credit facility       (4,700) $ (8,000)  
All Senior Notes [Member]            
Financing Obligations            
Unamortized fees   $ 8,600   $ 8,600   $ 9,500