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CONSOLIDATED STATEMENT OF CHANGES IN EQUITY - 6 months ended Jun. 30, 2015 - USD ($)
shares in Thousands, $ in Thousands
Total
Accumulated Deficit [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Treasury Stock [Member]
Balance at Dec. 31, 2014 $ 257,827 $ (544,746) $ 2,157 $ 819,757 $ (19,341)
Balance (in shares) at Dec. 31, 2014     21,573    
Balance (in shares) at Dec. 31, 2014         921
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net loss (33,625) (33,625)      
Stock options exercised, net 549     (607) $ 1,156
Stock options exercised, net (in shares)         (55)
Issuance of restricted stock, net 63     (147) $ 210
Issuance of restricted stock, net (in shares)         (10)
Stock-based compensation expense 992     992  
Balance at Jun. 30, 2015 $ 225,806 $ (578,371) $ 2,157 $ 819,995 $ (17,975)
Balance (in shares) at Jun. 30, 2015     21,573    
Balance (in shares) at Jun. 30, 2015         856