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Unaudited Quarterly Data
 12 Months Ended
Dec. 31, 2020
Unaudited Quarterly Data [Abstract]  
Unaudited Quarterly Data [Text Block] Unaudited Quarterly Data
Summarized quarterly financial data for the years ended December 31, 2020, and 2019 is as follows:
(In thousands, except per share data)1st Quarter2nd Quarter3rd Quarter4th Quarter
Year Ended December 31, 2020
Revenues$701,939 $683,746 $712,015 $716,491 
Gross profit420,178 399,532 425,028 427,414 
Operating profit48,875 53,635 80,187 54,639 
Net earnings49,292 38,493 64,030 56,300 
Basic earnings per common share$0.90 $0.72 $1.19 $1.04 
Diluted earnings per common share$0.88 $0.70 $1.15 $1.00 

(In thousands, except per share data)1st Quarter2nd Quarter3rd Quarter4th Quarter
Year Ended December 31, 2019
Revenues$696,694 $655,925 $649,371 $667,862 
Gross profit424,866 408,071 399,996 411,138 
Operating profit17,349 129,829 38,847 67,834 
Net earnings7,323 94,455 31,277 40,491 
Basic earnings per common share$0.14 $1.74 $0.57 $0.74 
Diluted earnings per common share$0.13 $1.70 $0.56 $0.72