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Short-Term Investments	9 Months Ended
Short-Term Investments	Sep. 30, 2011
Short-Term Investments [Abstract]
Short-Term Investments	NOTE 5 — SHORT-TERM INVESTMENTS As of September 30, 2011, short-term investments consisted of United States treasury bills maturing in January 2012 and May 2012. The amortized cost, gross unrealized gain and estimated fair value of short-term investments at September 30, 2011 were $75.0 million, $0.0 million, and $75.0 million, respectively. As of December 31, 2010, short-term investments consisted of a United States treasury note maturing in April 2011. The amortized cost, gross unrealized gain and estimated fair value of short-term investments at December 31, 2010 were $100.0 million, $0.0 million and $100.0 million, respectively.