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Net Income per Share (Notes)
 12 Months Ended
Dec. 31, 2013
Earnings Per Share [Abstract]  
Net Income per Share
Net Income per Share
The following table sets forth the calculation of the denominators used to compute basic and diluted net income per share:
 
 
December 31,
 
2013
 
2012
 
2011
 
(In thousands)
Shares outstanding at the beginning of the period
46,762

 
45,815

 
45,463

Weighted-average number of shares repurchased
(1,445
)
 
(2
)
 
(160
)
Weighted-average number of shares issued
400

 
567

 
453

Denominator for basic net income per share
45,717

 
46,380

 
45,756

Dilutive effect of employee stock options and stock grants (1)
643

 
619

 
669

Dilutive effect of convertible senior notes (2)
502

 
—

 
—

Denominator for diluted net income per share
46,862

 
46,999

 
46,425

_______________________________ 
(1)
Unvested restricted shares are included in the calculation of diluted net income per share when their grant date fair values are below the average fair value of our common shares for each of the periods presented. Options to purchase common shares are included in the calculation of diluted net income per share when their exercise prices are below the average fair value of our common shares for each of the periods presented. For the years ended December 31, 2013, 2012, and 2011 there were approximately 51,000, 87,000 and 137,000 anti-dilutive weighted options, respectively. For the years ended December 31, 2013 and 2011 anti-dilutive restricted shares were insignificant. For the year ended December 31, 2012 there were approximately 304,000 anti-dilutive restricted shares.
(2)
Potentially dilutive shares issuable pursuant to our 1.125% Warrants (defined in Note 12, "Long-Term Debt") were not included in the computation of diluted net income per share for the year ended December 31, 2013, because to do so would have been anti-dilutive. Potentially dilutive shares issuable pursuant to our 3.75% Notes (defined in Note 12, "Long-Term Debt") were not included in the computation of diluted net income per share for the years ended December 31, 2012, and 2011 because to do so would have been anti-dilutive.