Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Computation of Earnings Per Common Share

	Three Months Ended
	March 31,
(in thousands, except per share data)	2018		2017
Numerator:
Net income to common shareholders	$	72,475	$	49,014
Net income allocated to participating securities - basic and diluted		1,366		1,156
Net income allocated to common shareholders - basic and diluted	$	71,109	$	47,858
Denominator:
Weighted-average common shares - basic	$	85,241	$	84,365
Dilutive potential common shares		182		259
Weighted-average common shares - diluted	$	85,423	$	84,624
Earnings per common share:
Basic	$	0.83	$	0.57
Diluted	$	0.83	$	0.57