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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Common Stock [Member]
Additional Paid In Capital [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Deficit [Member]
Total
Balance at Dec. 31, 2013 $ 116 $ 1,324,804 $ 21,080 $ (967,610) $ 378,390
Balance (in shares) at Dec. 31, 2013 116,471        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net loss $ 0 0 0 (38,984) (38,984)
Change in unrealized gains (losses), net of tax 0 0 18,667 0 18,667
Foreign currency translation         0
Issuance of common stock in connection with employee stock plans $ 2 23,071 0 0 23,073
Issuance of common stock in connection with employee stock plans (in shares) 1,972        
2 3/4 percent convertible senior notes redemption, equity portion $ 0 (326,444) 0 0 (326,444)
1 percent convertible senior notes, equity portion, net of issuance costs 0 170,232 0 0 170,232
Share-based compensation expense 0 31,383 0 0 31,383
Excess tax benefits from shared-based compensation awards 0 1,463 0 0 1,463
Balance at Dec. 31, 2014 $ 118 1,224,509 39,747 (1,006,594) 257,780
Balance (in shares) at Dec. 31, 2014 118,443        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net loss $ 0 0 0 (88,278) (88,278)
Change in unrealized gains (losses), net of tax 0 0 (53,312) 0 (53,312)
Foreign currency translation         0
Issuance of common stock in connection with employee stock plans $ 2 24,888 0 0 24,890
Issuance of common stock in connection with employee stock plans (in shares) 1,908        
Share-based compensation expense $ 0 59,314 0 0 59,314
Excess tax benefits from shared-based compensation awards 0 396 0 0 396
Balance at Dec. 31, 2015 $ 120 1,309,107 (13,565) (1,094,872) 200,790
Balance (in shares) at Dec. 31, 2015 120,351        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net loss $ 0 0 0 (86,556) (86,556)
Change in unrealized gains (losses), net of tax 0 0 (16,772) 0 (16,772)
Foreign currency translation 0 0 (21) 0 (21)
Issuance of common stock in connection with employee stock plans $ 2 13,706 0 0 13,708
Issuance of common stock in connection with employee stock plans (in shares) 1,285        
2 3/4 percent convertible senior notes redemption, equity portion $ 0 (128,888) 0 0 (128,888)
1 percent convertible senior notes, equity portion, net of issuance costs 0 43,335 0 0 43,335
Share-based compensation expense 0 72,108 0 0 72,108
Excess tax benefits from shared-based compensation awards 0 1,861 0 0 1,861
Balance at Dec. 31, 2016 $ 122 $ 1,311,229 $ (30,358) $ (1,181,428) $ 99,565
Balance (in shares) at Dec. 31, 2016 121,636