Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 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 and six months ended June 30 (in thousands, except per share data):

	Three Months Ended June 30,				Six Months Ended June 30,
	2014		2013		2014		2013
Net income	$	88,549	$	73,099	$	163,658	$	137,761
Denominator for basic and diluted earnings per share:
Denominator for basic earnings per share		82,996		81,573		82,867		81,398
Dilutive securities		2,821		2,888		2,890		2,814
Denominator for diluted earnings per share		85,817		84,461		85,757		84,212
Basic earnings per share	$	1.07	$	0.90	$	1.97	$	1.69
Diluted earnings per share	$	1.03	$	0.87	$	1.91	$	1.64