Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2014

Earnings Per Share [Abstract]

Summary of Earnings Per Share, Basic and Diluted

The calculation and reconciliation of basic and diluted earnings per share for the three months ended March 31 (in thousands, except per share data):

	Three Months Ended March 31,
	2014		2013
Net income	$	75,109	$	64,662
Denominator for basic earnings per share		82,737		81,222
Dilutive securities		2,958		2,738
Denominator for diluted earnings per share		85,695		83,960
Basic earnings per share	$	0.91	$	0.80
Diluted earnings per share	$	0.88	$	0.77