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Quarterly Results of Operations (Tables)
12 Months Ended
Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Results of Operations
(In thousands, except per share amounts)First QuarterSecond QuarterThird QuarterFourth Quarter
2020:
Operating revenues$592,703 $568,959 $590,214 $620,302 
Operating income31,066 52,818 62,103 81,451 
Net income23,058 39,132 46,332 60,556 
Basic earnings per share0.33 0.57 0.67 0.88 
Diluted earnings per share0.33 0.56 0.67 0.88 
 
(In thousands, except per share amounts)First QuarterSecond QuarterThird QuarterFourth Quarter
2019:
Operating revenues$596,117 $627,533 $618,264 $621,787 
Operating income48,019 58,442 53,357 65,654 
Net income36,086 43,318 39,044 48,496 
Basic earnings per share0.51 0.62 0.56 0.70 
Diluted earnings per share0.51 0.62 0.56 0.70