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Inventories and natural gas in storage (Tables)
9 Months Ended
Sep. 30, 2021
Inventory Disclosure [Abstract]  
Inventories Inventories on the Consolidated Balance Sheets were as follows:
 September 30, 2021September 30, 2020December 31, 2020
 (In thousands)
Aggregates held for resale$183,693 $168,132 $175,782 
Asphalt oil32,964 27,587 28,238 
Natural gas in storage (current)28,683 27,135 21,919 
Materials and supplies27,253 26,609 25,142 
Merchandise for resale26,639 21,525 21,087 
Other13,053 15,235 18,999 
Total$312,285 $286,223 $291,167