Annual report pursuant to Section 13 and 15(d)

Quarterly Financial Data -- Unaudited (Details Textual)

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Quarterly Financial Data -- Unaudited (Details Textual) (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Net income (loss) per common share-basic (in dollars per share) $ 0.02 [1],[2] $ 0.01 [1],[2] $ 0.49 [1],[2] $ 0.02 [1],[2] $ 0.01 [1],[2] $ 0.02 [1],[2] $ 0.03 [1],[2] $ 0.01 [1],[2] $ 0.51 $ 0.04 $ 0.55 $ 0.07 $ 0.01
Previously Reported [Member]
                          
Net income (loss) per common share-basic (in dollars per share)     $ 0.83 $ 0.03 $ 0.02   $ 0.05 $ 0.02 $ 0.86 $ 0.07   $ 0.11  
[1] The sum of quarterly net income per share applicable to common stockholders (basic and diluted) does not necessarily agree to the net income per share for the year due to the timing of our common stock issuances.
[2] We identified and corrected an immaterial error affecting the historical presentation of basic earnings per share. The adjustment reflects the Series B Preferred Stock held by Liberty Media as participating securities as the holders of such preferred stock may participate in dividends and distributions ratably with holders of our common stock on an as-converted basis as disclosed in Footnote 3. The effects of the error were not material to any previously reported quarterly or annual period. The corrected net income per common share--basic calculations are presented in the quarterly results of operations table. The previously reported net income per common share--basic for the three months ended March 31, 2012 and June 30, 2012 were $0.03 and $0.83, respectively. The previously reported net income per common share--basic for the six months ended June 30, 2012 was $0.86 and the adjusted net income per common share--basic was $0.51. The previously reported net income per common share--basic for the three month ended March 31, 2011, June 30, 2011, and December 31, 2011 were $0.02, $0.05 and $0.02, respectively. The previously reported net income per common share--basic for the six months ended June 30, 2011 was $0.07 and the adjusted net income per common share--basic was $0.04.