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Inventories and natural gas in storage (Tables)
6 Months Ended
Jun. 30, 2020
Inventory Disclosure [Abstract]  
Inventories Inventories on the Consolidated Balance Sheets were as follows:
 June 30, 2020June 30, 2019December 31, 2019
 (In thousands)
Aggregates held for resale$165,357  $147,030  $147,723  
Asphalt oil57,207  80,418  41,912  
Materials and supplies27,805  28,746  22,512  
Merchandise for resale22,974  27,167  22,232  
Natural gas in storage (current)11,776  15,841  22,058  
Other17,718  26,742  21,970  
Total$302,837  $325,944  $278,407