Earnings and Dividends Per Share (Tables)

12 Months Ended

Dec. 31, 2020

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):

	Year Ended December 31,
	2020		2019		2018
Net income attributable to common stockholders	$	185,126	$	160,456	$	154,333
BASIC:
Weighted average common shares outstanding	44,696,285		43,417,828		41,943,873
DILUTED:
Weighted average common shares outstanding	44,696,285		43,417,828		41,943,873
Stock options	1,719		75,196		67,735
Convertible subordinated debentures	—		210,224		80,123
Weighted average dilutive common shares outstanding	44,698,004		43,703,248		42,091,731
Net income attributable to common stockholders - basic	$	4.14	$	3.70	$	3.68
Net income attributable to common stockholders - diluted	$	4.14	$	3.67	$	3.67
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 shares	390,596		4,678		518
Regular dividends declared per common share	$	4.41	$	4.20	$	4.00