REVENUES (Tables)	9 Months Ended
	Sep. 30, 2021
REVENUES [Abstract]
Revenues by Geographic Market	Three Months Ended September 30, 2021in thousandsAggregates Asphalt Concrete Calcium Total Total Revenues by Geographic Market 1 East$     362,913  $     44,019  $     63,137  $              0  $      470,069  Gulf Coast 616,832  52,601  19,688  1,474  690,595  West 159,334  124,032  14,696  0  298,062  U.S. Concrete 33,330  0  121,704  0  155,034  Segment sales$  1,172,409  $   220,652  $   219,225  $       1,474  $   1,613,760  Intersegment sales (97,254) (97,254) Total revenues$  1,075,155  $   220,652  $   219,225  $       1,474  $   1,516,506  Three Months Ended September 30, 2020in thousandsAggregates Asphalt Concrete Calcium Total Total Revenues by Geographic Market 1 East$     360,985  $     46,212  $     73,181  $              0  $      480,378  Gulf Coast 535,215  55,894  18,889  1,354  611,352  West 152,762  133,095  10,737  0  296,594  Segment sales$  1,048,962  $   235,201  $   102,807  $       1,354  $   1,388,324  Intersegment sales (78,434) 0  0  0  (78,434) Total revenues$     970,528  $   235,201  $   102,807  $       1,354  $   1,309,890  Nine Months Ended September 30, 2021in thousandsAggregates Asphalt Concrete Calcium Total Total Revenues by Geographic Market 1 East$     960,679  $    104,216  $    184,492  $               0  $    1,249,387  Gulf Coast 1,743,200  140,088  55,714  5,494  1,944,496  West 455,476  336,092  34,874  0  826,442  U.S. Concrete 33,330  0  121,705  0  155,035  Segment sales$  3,192,685  $    580,396  $    396,785  $        5,494  $    4,175,360  Intersegment sales (229,463) (229,463) Total revenues$  2,963,222  $    580,396  $    396,785  $        5,494  $    3,945,897  Nine Months Ended September 30, 2020in thousandsAggregates Asphalt Concrete Calcium Total Total Revenues by Geographic Market 1 East$     951,090  $    102,053  $    206,954  $               0  $    1,260,097  Gulf Coast 1,596,321  140,253  53,801  5,269  1,795,644  West 440,373  355,634  37,500  0  833,507  Segment sales$  2,987,784  $    597,940  $    298,255  $        5,269  $    3,889,248  Intersegment sales (207,541) 0  0  0  (207,541) Total revenues$  2,780,243  $    597,940  $    298,255  $        5,269  $    3,681,707  1The geographic markets are defined by states/countries as follows: East market — Arkansas, Delaware, Illinois, Kentucky, Maryland, North Carolina, Pennsylvania, Tennessee, Virginia, and Washington D.C.Gulf Coast market — Alabama, Florida, Georgia, Louisiana, Mississippi, Oklahoma, Quintana Roo (Mexico), South Carolina and TexasWest market — Arizona, California and New Mexico U.S. Concrete — British Columbia (Canada), California, Hawaii, New Jersey, New York, Oklahoma, Pennsylvania, Texas, the U.S. Virgin Islands, and Washington D.C.
Freight & Delivery Revenues	Three Months Ended Nine Months Ended September 30 September 30in thousands2021 2020 2021 2020 Freight & Delivery Revenues Total revenues$  1,516,506  $  1,309,890  $  3,945,897  $  3,681,707  Freight & delivery revenues 1 (206,127) (187,562) (564,595) (566,785) Total revenues excluding freight & delivery$  1,310,379  $  1,122,328  $  3,381,302  $  3,114,922  1Includes freight & delivery to remote distribution sites.
Reconciliation of Deferred Revenue Balances	Three Months Ended Nine Months Ended September 30 September 30in thousands2021 2020 2021 2020 Deferred Revenue Balance at beginning of period$     174,076  $     181,963  $     177,962  $     185,339  Revenue recognized from deferred revenue (2,022) (2,046) (5,908) (5,422) Balance at end of period$     172,054  $     179,917  $     172,054  $     179,917