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Inventories and natural gas in storage (Tables)
9 Months Ended
Sep. 30, 2020
Inventory Disclosure [Abstract]  
Inventories Inventories on the Consolidated Balance Sheets were as follows:
 September 30, 2020September 30, 2019December 31, 2019
 (In thousands)
Aggregates held for resale$168,132 $143,157 $147,723 
Asphalt oil27,587 39,269 41,912 
Materials and supplies26,609 25,696 22,512 
Merchandise for resale21,525 23,902 22,232 
Natural gas in storage (current)27,135 32,164 22,058 
Other15,235 21,869 21,970 
Total$286,223 $286,057 $278,407