Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2017

Earnings Per Share [Abstract]

Computation of Earnings Per Common Share

	Three months ended				Six months ended
	June 30,				June 30,
(in thousands, except per share data)	2017		2016		2017		2016
Numerator:
Net income to common shareholders	$	52,267	$	46,907	$	101,281	$	50,746
Net income allocated to participating securities - basic and diluted		1,166		1,136		2,322		1,233
Net income allocated to common shareholders - basic and diluted	$	51,101	$	45,771	$	98,959	$	49,513
Denominator:
Weighted-average common shares - basic	$	84,614	$	77,523	$	84,489	$	77,512
Dilutive potential common shares		253		157		266		164
Weighted-average common shares - diluted	$	84,867	$	77,680	$	84,755	$	77,676
Earnings per common share:
Basic	$	0.60	$	0.59	$	1.17	$	0.64
Diluted	$	0.60	$	0.59	$	1.17	$	0.64