Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2016

Earnings Per Share [Abstract]

Computation of Earnings Per Common Share

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
(in thousands, except per share data)	2016		2015		2016		2015
Numerator:
Net income to common shareholders	$	46,719	$	41,166	$	97,465	$	116,154
Net income allocated to participating securities - basic and diluted		1,101		840		2,334		2,541
Net income allocated to common shareholders - basic and diluted	$	45,618	$	40,326	$	95,131	$	113,613
Denominator:
Weighted-average common shares - basic	$	77,550	$	77,928	$	77,525	$	78,452
Dilutive potential common shares		127		147		128		157
Weighted-average common shares - diluted	$	77,677	$	78,075	$	77,653	$	78,609
Earnings per common share:
Basic	$	0.59	$	0.52	$	1.23	$	1.45
Diluted	$	0.59	$	0.52	$	1.23	$	1.45