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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
The following tables sets forth certain unaudited consolidated quarterly financial data for the years ended 2020 and 2019:
 For the Quarters Ended
(in thousands, except per share amounts)3/31/20206/30/20209/30/202012/31/2020
Operating revenue$352,920 $385,086 $436,727 $467,642 
Operating income$55,193 $82,211 $73,183 $120,395 
Equity in (losses)/earnings of affiliates, net of tax$512 $376 $971 $— 
Components of net income:
Net income from continuing operations$24,284 $51,069 $102,467 $86,430 
Loss from discontinued operations, net of tax9,535 7,935 10,679 6,214 
Gain from sale of discontinued operations, net of tax— — — 2,742 
Net income$33,819 $59,004 $113,146 $95,386 
Basic income/(loss) per share:    
Net income from continuing operations$0.31 $0.64 $1.29 $1.13 
Loss from discontinued operations, net of tax0.12 0.10 0.13 0.08 
Gain from sale of discontinued operations, net of tax— — — 0.04 
Net income$0.43 $0.74 $1.42 $1.25 
Diluted income/(loss) per share:    
Net income from continuing operations$0.30 $0.63 $1.26 $1.10 
Loss from discontinued operations, net of tax0.12 0.10 0.13 0.08 
Gain from sale of discontinued operations, net of tax— — — 0.03 
Net income$0.42 $0.73 $1.39 $1.21 
Weighted-average common shares outstanding:    
Basic79,028 79,403 79,467 76,271 
Diluted80,525 80,646 81,402 78,371 
 For the Quarters Ended
(in thousands, except per share amounts)3/31/20196/30/20199/30/201912/31/2019
Operating revenue$337,723 $374,738 $375,571 $352,841 
Operating income$8,002 $1,801 $61,867 $50,365 
Equity in earnings/(losses) of affiliates, net of tax$(422)$313 $607 $58 
Components of net income:
Net income from continuing operations$(7,873)$(15,570)$31,668 $25,545 
Loss from discontinued operations, net of tax9,559 9,999 (8,485)4,537 
Net income$1,686 $(5,571)$23,183 $30,082 
Basic income/(loss) per share:    
Net income from continuing operations$(0.10)$(0.19)$0.40 $0.32 
Loss from discontinued operations, net of tax0.12 0.12 (0.11)0.06 
Net income$0.02 $(0.07)$0.29 $0.38 
Diluted income/(loss) per share:    
Net income from continuing operations$(0.10)$(0.19)$0.39 $0.32 
Loss from discontinued operations, net of tax0.12 0.12 (0.10)0.06 
Net income$0.02 $(0.07)$0.29 $0.38 
Weighted-average common shares outstanding:    
Basic80,179 80,473 79,761 79,125 
Diluted81,277 80,473 80,914 80,356