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Net Loss Per Common Share (Tables)
3 Months Ended
Mar. 31, 2013
Net Loss Per Common Share [Abstract]  
Anti-dilutive securities excluded from computation of earnings per share
                 
    Three Months Ended  
    March 31,  
Common shares issuable upon:   2013     2012  
    (in thousands)  

Conversion of convertible senior notes

    1,438       1,438  

Exercise or vesting of share-based awards

    857       987