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Other Income	3 Months Ended
Other Income	Mar. 31, 2012
Other Income [Abstract]
Other Income	5. Other Income On March 30, 2012 the Company sold its cost-based investment in Ziplist for $0.8 million in cash. The carrying value of the investment had been written down to zero as of December 31, 2011, when the Company concluded that the investment was substantially impaired. Accordingly, the Company recorded a gain of $0.8 million in connection with the sale transaction in the first quarter of 2012, which represents cash received in excess of carrying value.