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Leases - Balance Sheet Information (Details) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Operating Leases:    
Operating Lease, Right-of-Use Asset $ 108,683 $ 187,097
Current Portion of Operating Lease Obligations 52,575 61,670
Operating Lease Obligations 53,235 110,466
Total Operating Lease Liabilities 105,810 172,136
Finance Leases:    
Property, Plant and Equipment 72,653 72,916
Less—Accumulated Depreciation, Depletion and Amortization 67,508 63,008
Property, Plant and Equipment—Net 5,145 9,908
Current Portion of Finance Lease Obligations 6,876 7,164
Finance Lease Obligations 1,057 7,706
Total Finance Lease Liabilities $ 7,933 $ 14,870