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Unaudited Quarterly Data Unaudited Quarterly Data (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Unaudited Quarterly Data [Abstract]                      
Total revenues $ 716,491 $ 712,015 $ 683,746 $ 701,939 $ 667,862 $ 649,371 $ 655,925 $ 696,694 $ 2,814,191 $ 2,669,852 $ 2,660,465
Gross profit 427,414 425,028 399,532 420,178 411,138 399,996 408,071 424,866 1,672,152 1,644,071 1,688,168
Operating profit 54,639 80,187 53,635 48,875 67,834 38,847 129,829 17,349 237,336 253,859 56,137
Net earnings $ 56,300 $ 64,030 $ 38,493 $ 49,292 $ 40,491 $ 31,277 $ 94,455 $ 7,323 $ 208,115 $ 173,546 $ 8,492
Basic earnings per common share $ 1.04 $ 1.19 $ 0.72 $ 0.90 $ 0.74 $ 0.57 $ 1.74 $ 0.14 $ 3.84 $ 3.19 $ 0.16
Diluted earnings per common share $ 1.00 $ 1.15 $ 0.70 $ 0.88 $ 0.72 $ 0.56 $ 1.70 $ 0.13 $ 3.73 $ 3.10 $ 0.16