Net Income Per Share (Tables)

12 Months Ended

Dec. 31, 2015

Earnings Per Share [Abstract]

Calculation of Net Income Per Share

The calculation of net income per share for the three years ended December 31, 2015 is reflected in the following table (in thousands, except per share amounts):

	Years Ended December 31,
	2015		2014		2013
Basic net income per share:
Net income	$	357,796	$	305,928	$	252,195
Income allocated to participating securities	—		—		3
Net income available to common stockholders	$	357,796	$	305,928	$	252,192
Basic weighted average shares	131,749		134,358		136,153
Basic net income per share	$	2.72	$	2.28	$	1.85
Diluted net income per share:
Net income	$	357,796	$	305,928	$	252,195
Income allocated to participating securities	—		—		3
Net income available to common stockholders	$	357,796	$	305,928	$	252,192
Basic weighted average shares	131,749		134,358		136,153
Dilutive effect of potential common shares	1,181		1,183		1,436
Diluted weighted average shares	132,930		135,541		137,589
Diluted net income per share	$	2.69	$	2.26	$	1.83