Net Income per Share (Tables)

3 Months Ended

Mar. 31, 2015

Earnings Per Share [Abstract]

Schedule of calculation of numerator and denominator in earnings per share

	Three Months Ended
	March 31,
Net Income per Basic and Diluted Share:	2015		2014
(in thousands except per share amounts)
Numerator
Net income used to compute net income per basic and diluted share	$	84,498	$	72,883
Denominator
Weighted-average shares used to compute net income per basic share	162,829		151,198
Restricted stock outstanding	28		68
Effect of dilutive stock options	18		21
Assumed conversion of Series 2012 Notes	666		6,903
Assumed conversion of warrants	1,927		—
Assumed conversion of May 2015 Notes	4,944		6,381
Weighted-average shares used to compute net income per diluted share	170,412		164,571
Net income per share - basic	$	0.52	$	0.48
Net income per share - diluted	$	0.50	$	0.44