Earnings Per Share (Tables)

9 Months Ended

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

	Three Months Ended September 30,				Nine months Ended September 30,
	2014		2013		2014		2013
Net income	$	95,509	$	78,620	$	259,167	$	216,381
Denominator for basic and diluted earnings per share:
Denominator for basic earnings per share		83,611		81,974		83,118		81,592
Dilutive securities		2,523		2,931		2,570		2,854
Denominator for diluted earnings per share		86,134		84,905		85,688		84,446
Basic earnings per share	$	1.14	$	0.96	$	3.12	$	2.65
Diluted earnings per share	$	1.11	$	0.93	$	3.02	$	2.56