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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Commitments Contractual Obligation Maturities
Our construction program and other commitments and commitments under capacity and energy agreements, coal purchase and coal delivery contracts and land easements as of December 31, 2020, are as follows:
(in thousands)Construction Program
and Other Commitments
Capacity and Energy
Requirements
Coal Purchase
Commitments
Land
Easement
Payments
2021$31,195 $16,280 $22,935 $1,900 
2022957 11,854 22,793 1,361 
2023233 11,854 23,955 1,386 
2024240 11,828 24,369 1,410 
2025247 11,784 25,103 1,436 
Beyond 20256,951 120,756 454,020 29,202 
Total$39,823 $184,356 $573,175 $36,695