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Earnings and Dividends Per Share (Tables)
9 Months Ended
Sep. 30, 2021
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
The following table summarizes the average number of common shares and the net income used in the calculation of basic and diluted earnings per common share ($ in thousands, except share and per share amounts):

Three Months EndedNine Months Ended
September 30,September 30,
2021202020212020
Net income attributable to common stockholders$30,814 $42,595 $105,327 $147,986 
BASIC:
Weighted average common shares outstanding45,850,599 44,661,650 45,668,762 44,641,748 
DILUTED:
Weighted average common shares outstanding45,850,599 44,661,650 45,668,762 44,641,748 
Stock options825 753 6,391 1,766 
Convertible senior notes— — 13,938 — 
Weighted average dilutive common shares outstanding45,851,424 44,662,403 45,689,091 44,643,514 
Net income attributable to common stockholders - basic$0.67 $0.95 $2.31 $3.31 
Net income attributable to common stockholders - diluted$0.67 $0.95 $2.31 $3.31 
Incremental anti-dilutive shares excluded:
Net share effect of stock options with an exercise price in excess of the average market price for our common shares505,459 410,012 308,313 427,180 
Regular dividends declared per common share$0.90 $1.1025 $2.9025 $3.3075