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Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Provisional one-time charge on US tax reform |  |  |  |  |  |  |  |  | $ 71,982 | $ 0 | $ 0
Cash Tax Portion of the One Time Provisional Transition Tax Charge | $ 59,000 |  |  |  |  |  |  |  | 59,000 |  |
Net Sales | 778,031 | $ 698,799 | $ 653,656 | $ 594,567 | $ 709,699 | $ 650,598 | $ 608,286 | $ 539,674 | 2,725,053 | 2,508,257 | 2,395,447
Gross profit | 455,219 | 400,277 | 374,917 | 342,900 | 418,610 | 369,494 | 347,576 | 299,907 | 1,573,313 | 1,435,587 | 1,351,993
Net earnings | $ 76,976 | $ 104,950 | $ 101,580 | $ 92,466 | $ 137,776 | $ 101,332 | $ 79,588 | $ 65,674 | $ 375,972 | $ 384,370 | $ 352,820
Basic earnings per common share: |  |  |  |  |  |  |  |  |  |  |
Net earnings | $ 3.01 | $ 4.10 | $ 3.94 | $ 3.57 | $ 5.27 | $ 3.84 | $ 2.99 | $ 2.44 | $ 14.62 | $ 14.49 | $ 12.75
Weighted average number of common shares | 25,562,542 | 25,613,433 | 25,751,374 | 25,932,112 | 26,139,024 | 26,375,468 | 26,631,015 | 26,931,293 | 25,713,575 | 26,517,768 | 27,680,918
Diluted earnings per common share: |  |  |  |  |  |  |  |  |  |  |
Net earnings | $ 2.93 | $ 3.99 | $ 3.84 | $ 3.48 | $ 5.17 | $ 3.77 | $ 2.93 | $ 2.40 | $ 14.24 | $ 14.22 | $ 12.48
Weighted average number of common and common equivalent shares | 26,229,052 | 26,303,529 | 26,439,529 | 26,586,061 | 26,631,269 | 26,888,810 | 27,143,284 | 27,421,019 | 26,393,783 | 27,023,905 | 28,269,615
Market price per share: |  |  |  |  |  |  |  |  |  |  |
Common Stock Value During The Period Maximum | $ 689.11 | $ 635.17 | $ 601.16 | $ 486.90 | $ 429.91 | $ 419.83 | $ 385.50 | $ 347.09 |  |  |
Common Stock Value During The Period Mimimum | $ 606.80 | $ 571.25 | $ 473.87 | $ 414.52 | $ 397.73 | $ 363.19 | $ 347.76 | $ 298.14 |  |  |

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