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Long-Term Debt and Finance Lease Obligations - Capital Lease Obligation Table (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Long-term Debt and Lease Obligation, Including Current Maturities [Abstract]    
Long-term debt   $ 0
Finance leases $ 14,306 7,538
Total long-term debt and finance lease obligations 905,448 603,020
Less current portion of long-term debt and finance lease obligations (11,611) (6,590)
Long-term debt and finance lease obligations, excluding current installments 893,837 596,430
Debt Instrument, Unamortized Discount   2,800
Revolving credit commitments    
Long-term Debt and Lease Obligation, Including Current Maturities [Abstract]    
Outstanding borrowings 105,000 0
Letter of credit outstanding 31,000 0
Seller Note    
Long-term Debt and Lease Obligation, Including Current Maturities [Abstract]    
Long-term debt 37,222  
Other loans    
Long-term Debt and Lease Obligation, Including Current Maturities [Abstract]    
Long-term debt 2,000 2,006
Finance leases    
Long-term Debt and Lease Obligation, Including Current Maturities [Abstract]    
Finance leases 14,306 7,538
Senior notes    
Long-term Debt and Lease Obligation, Including Current Maturities [Abstract]    
Long-term debt 746,920 593,476
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net $ 3,100 $ 6,500