Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2015

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) follows:

	Three Months Ended March 31,
	2015		2014
Net income	$	94,153	$	75,109
Denominator for basic earnings per share		91,750		82,737
Dilutive securities		2,184		2,958
Denominator for diluted earnings per share		93,934		85,695
Basic earnings per share	$	1.03	$	0.91
Diluted earnings per share	$	1.00	$	0.88