Earnings Per Common Share (Tables)

9 Months Ended

Sep. 30, 2018

Earnings Per Common Share [Abstract]

Computation of Earnings Per Common Share

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
(in thousands, except per share data)	2018		2017		2018		2017
Numerator:
Net income to common shareholders	$	83,878	$	58,902	$	227,530	$	160,183
Net income allocated to participating securities - basic and diluted		1,544		1,244		4,238		3,566
Net income allocated to common shareholders - basic and diluted	$	82,334	$	57,658	$	223,292	$	156,617
Denominator:
Weighted-average common shares - basic	$	85,348	$	84,749	$	85,298	$	84,577
Dilutive potential common shares		191		231		184		241
Weighted-average common shares - diluted	$	85,539	$	84,980	$	85,482	$	84,818
Earnings per common share:
Basic	$	0.96	$	0.68	$	2.62	$	1.85
Diluted	$	0.96	$	0.68	$	2.61	$	1.85