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Long-Term Debt (Tables)
 12 Months Ended
Dec. 31, 2020
Debt Disclosure [Abstract]  
Summary of Long-Term Debt
Long-term debt consisted of the following:

As of December 31,
(in thousands)20202019
Fixed-rate debt and finance lease obligations due through 2030$525,240 $235,071 
Variable-rate debt due through 20291,133,771 1,186,782 
Total long-term debt and finance lease obligations, net of related costs1,659,011 1,421,853 
Less current maturities, net of related costs217,234 173,274 
Long-term debt and finance lease obligations, net of current maturities and related costs$1,441,777 $1,248,579 
Weighted average fixed-interest rate on debt5.7 %3.7 %
Weighted average variable-interest rate on debt2.4 %4.5 %
Schedule of Maturities of Long-term Debt [Table Text Block]
Maturities of long-term debt as of December 31, 2020, for the next five years and thereafter, in the aggregate, are:

(in thousands)As of December 31, 2020
2021$217,234 
2022137,252 
2023136,781 
2024806,383 
202589,194 
Thereafter272,167 
Total debt and finance lease obligations, net of related costs$1,659,011