Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2013

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 and nine months ended September 30 (in thousands, except per share data):

	Three Months Ended September 30,				Nine months Ended September 30,
	2013		2012		2013		2012
Net income	$	78,620	$	59,648	$	216,381	$	156,128
Denominator for basic earnings per share		81,974		84,002		81,592		83,260
Dilutive securities		2,931		2,222		2,854		2,421
Denominator for diluted earnings per share		84,905		86,224		84,446		85,681
Basic earnings per share	$	0.96	$	0.71	$	2.65	$	1.88
Diluted earnings per share	$	0.93	$	0.69	$	2.56	$	1.82