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Unaudited Quarterly Financial Data
 12 Months Ended
Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract]  
Unaudited Quarterly Financial Data UNAUDITED QUARTERLY FINANCIAL DATA
Quarterly results of operations for 2020 are summarized as follows:
 First QuarterSecond QuarterThird QuarterFourth Quarter
 (In thousands except per share data)
2020:    
Total revenues$52,488 216,015 202,702 223,537 
Net earnings$(2,062)48,413 10,825 35,135 
Basic earnings per share:
Class A$(0.58)13.69 3.06 9.94 
Class B$(0.29)6.85 1.53 4.97 
Diluted earnings per share:
Class A$(0.58)13.69 3.06 9.94 
Class B$(0.29)6.85 1.53 4.97 

Quarterly results of operations for 2019 are summarized as follows:

 First QuarterSecond QuarterThird QuarterFourth Quarter
 (In thousands except per share data)
2019:    
Total revenues$217,909 192,685 173,166 235,428 
Net earnings$40,198 33,696 19,989 37,733 
Basic earnings per share:    
Class A$11.37 9.53 5.65 10.67 
Class B$5.68 4.76 2.83 5.34 
Diluted earnings per share:    
Class A$11.37 9.53 5.65 10.67 
Class B$5.68 4.76 2.83 5.34 
 
Quarterly revenues reflect the differences between the change in fair value of derivative investments for each quarter corresponding to the performance of the indices upon which the Company's call options are based. The comparability of revenues is impacted by the application of fair value accounting to fixed-index business as follows:

 First QuarterSecond QuarterThird QuarterFourth Quarter
 (In thousands)
2020$(106,629)40,243 31,520 49,620 
2019$42,003 17,828 3,296 60,080