Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2015

Earnings Per Share [Abstract]

Computation of Earnings Per Common Share

A summary of the information used in the computation of earnings per common share follows.

	Three Months Ended June 30,				Six Months Ended June 30,
(in thousands, except per share data)	2015		2014		2015		2014
Numerator:
Net income to common shareholders	$	34,829	$	39,962	$	74,988	$	89,077
Net income allocated to participating securities - basic and diluted		766		819		1,701		1,900
Net income allocated to common shareholders - basic and diluted	$	34,063	$	39,143	$	73,287	$	87,177
Denominator:
Weighted-average common shares - basic		77,951		81,933		78,719		82,099
Dilutive potential common shares		164		241		162		249
Weighted-average common shares - diluted		78,115		82,174		78,881		82,348
Earnings per common share:
Basic	$	0.44	$	0.48	$	0.93	$	1.06
Diluted	$	0.44	$	0.48	$	0.93	$	1.06