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Inventories and natural gas in storage (Tables)
3 Months Ended
Mar. 31, 2021
Inventory Disclosure [Abstract]  
Inventories Inventories on the Consolidated Balance Sheets were as follows:
 March 31, 2021March 31, 2020December 31, 2020
 (In thousands)
Aggregates held for resale$180,450 $155,976 $175,782 
Asphalt oil59,853 73,842 28,238 
Materials and supplies26,481 26,293 25,142 
Merchandise for resale24,319 23,109 21,087 
Natural gas in storage (current)8,113 7,872 21,919 
Other17,521 18,866 18,999 
Total$316,737 $305,958 $291,167