Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity Warrants (Details)

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Stockholders' Equity Warrants (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Apr. 02, 2013
Class of Warrant or Right [Line Items]    
Warrants Exercised During Period (5,797,328)  
Class of Warrant or Right, Exercise Price of Warrants or Rights 11.00 10.25
Stock Issued During Period, Shares, Conversion of Convertible Securities 5,797,328  
Proceeds from issuance of common stock in connection with exercise of warrants $ 63,771  
Cashless Warrants Exercised During Period (100,000)  
Stock Issued During Period, Shares, Cashless Exercise of Warrants, Forfeited (93,649)  
Stock Issued During Period, Shares, Cashless Exercise of Warrant 6,351  
Class of Warrant or Right, Outstanding 7,634,101  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights   1.0727