Net Income per Share (Tables)

12 Months Ended

Dec. 31, 2015

Earnings Per Share [Abstract]

Schedule of calculation of numerator and denominator in earnings per share

	Year Ended December 31,
(In thousands, except per share amounts)	2015		2014		2013
Numerator
Net income	$	332,795	$	322,244	$	264,530
Add back interest expense for convertible notes, net of estimated tax of zero, zero and $13, for the years ended December 31, 2015, 2014 and 2013, respectively	—		—		25
Income used to compute net income per diluted share	$	332,795	$	322,244	$	264,555
Denominator
Total weighted-average shares used to compute net income per basic share	163,386		158,224		139,842
Effect of dilutive stock options	16		21		20
Restricted stock awards	152		126		83
Assumed conversion of Series 2012 Notes	—		3,532		12,373
Assumed conversion of February 2015 Notes	—		—		106
Assumed conversion of warrants	—		5,510		—
Assumed conversion of May 2015 Notes	—		5,697		6,919
Shares used to compute net income per diluted share	163,554		173,110		159,343
Net income per basic share	$	2.04	$	2.04	$	1.89
Net income per diluted share	$	2.03	$	1.86	$	1.66