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Inventories and natural gas in storage (Tables)
6 Months Ended
Jun. 30, 2021
Inventory Disclosure [Abstract]  
Inventories Inventories on the Consolidated Balance Sheets were as follows:
 June 30, 2021June 30, 2020December 31, 2020
 (In thousands)
Aggregates held for resale$183,977 $165,357 $175,782 
Asphalt oil51,500 57,207 28,238 
Materials and supplies27,969 27,805 25,142 
Merchandise for resale26,871 22,974 21,087 
Natural gas in storage (current)10,824 11,776 21,919 
Other15,187 17,718 18,999 
Total$316,328 $302,837 $291,167