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Financing Arrangements - Equipment Notes (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Debt Instrument [Line Items]          
Current portion of long-term debt $ 14,623   $ 14,623   $ 7,317
Long-term debt, excluding current maturities 651,011   651,011   443,259
Secured Debt | 2020 Equipment Note          
Debt Instrument [Line Items]          
Long-term debt 33,881   33,881   19,715
Current portion of long-term debt 8,727   8,727   5,107
Long-term debt, excluding current maturities 25,154   25,154   $ 14,608
Interest expense, debt $ 247 $ 115 $ 624 $ 288  
Secured Debt | 2020 Equipment Note | Minimum          
Debt Instrument [Line Items]          
Line of credit facility, interest rate at period end 2.36%   2.36%    
Secured Debt | 2020 Equipment Note | Maximum          
Debt Instrument [Line Items]          
Line of credit facility, interest rate at period end 3.79%   3.79%