Earnings Per Share (Tables)

9 Months Ended

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

	Three Months Ended September 30,				Nine Months Ended September 30,
	2015		2014		2015		2014
Net income	$	116,770	$	95,509	$	309,601	$	259,167
Denominator for basic and diluted earnings per share:
Denominator for basic earnings per share		92,110		83,611		91,923		83,118
Dilutive securities		2,047		2,523		2,146		2,570
Denominator for diluted earnings per share		94,157		86,134		94,069		85,688
Basic earnings per share	$	1.27	$	1.14	$	3.37	$	3.12
Diluted earnings per share	$	1.24	$	1.11	$	3.29	$	3.02