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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid-in Capital
Accumulated Deficit
Accumulated Other Comprehensive Gain (Loss)
Net income (loss) $ (33,748) $ 0 $ 0 $ (33,748) $ 0
Balance at Dec. 31, 2012 321,594 $ 112 1,075,761 (753,979) (300)
Balance (in shares) at Dec. 31, 2012   111,525      
Increase (Decrease) in Stockholders' Equity          
Unrealized gain (loss) on marketable securities, net of tax (5) $ 0 0 0 (5)
Issuance of common stock upon exercise of options, equity stock and employee stock purchase plan 7,865 $ 1 7,864 0 0
Issuance of common stock upon exercise of options, equity stock and stock units, and employee stock purchase plan (in shares)   1,934      
Stock-based compensation 14,981 $ 0 14,981 0 0
Balance at Dec. 31, 2013 340,229 $ 113 1,128,148 (787,727) (305)
Balance (in shares) at Dec. 31, 2013   113,459      
Increase (Decrease) in Stockholders' Equity          
Equity component of 1.125% convertible senior notes due 2018 29,542 $ 0 29,542 0 0
Net income (loss) 26,201 0 0 26,201 0
Unrealized gain (loss) on marketable securities, net of tax (97) 0 0 0 (97)
Issuance of common stock upon exercise of options, equity stock and employee stock purchase plan 10,559 $ 2 10,557 0 0
Issuance of common stock upon exercise of options, equity stock and stock units, and employee stock purchase plan (in shares)   1,703      
Stock-based compensation 14,730 $ 0 14,730 0 0
Balance at Dec. 31, 2014 391,622 $ 115 1,153,435 (761,526) (402)
Balance (in shares) at Dec. 31, 2014   115,162      
Net income (loss) 211,388 $ 0 0 211,388 0
Increase (Decrease) in Stockholders' Equity          
Unrealized gain (loss) on marketable securities, net of tax 775 0 0 0 775
Issuance of common stock upon exercise of options, equity stock and employee stock purchase plan $ 13,077 $ 2 13,075 0 0
Issuance of common stock upon exercise of options, equity stock and stock units, and employee stock purchase plan (in shares)   1,938      
Stock Repurchased and Retired During Period, Shares (7,812) (7,812)      
Stock Repurchased and Retired During Period, Value $ (80,000) $ (8) (45,926) (54,179) 0
Repurchase and retirement of common stock under repurchase plan, including prepayment under accelerated share repurchase program (100,113)        
Stock-based compensation 15,096 0 15,096 0 0
Balance at Dec. 31, 2015 526,533 $ 109 1,130,368 (604,317) 373
Balance (in shares) at Dec. 31, 2015   109,288      
Increase (Decrease) in Stockholders' Equity          
Equity component of 1.125% convertible senior notes due 2018   $ 0   $ 0 $ 0
Tax shortfall from stock option forfeitures $ (5,312)   $ (5,312)