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Investments carried at fair value
9 Months Ended
Sep. 30, 2011
Investments carried at fair value [Abstract] 
Investments carried at fair value
5.  Investments Carried at Fair Value

Investments include $2.0 million and $2.3 million of investments carried at fair value as of September 30, 2011 and December 31, 2010, respectively, consisting of equity, bond and money market mutual funds.  These investments were acquired under a rabbi trust arrangement related to a non-qualified supplemental retirement plan maintained by the Company.  During the nine months ended September 30, 2011, the Company recognized $27 thousand in net losses on dispositions of investments, recognized $17 thousand in dividend and interest income from investments, and recognized net unrealized losses of $236 thousand on these investments.  Fair values for these investments held under the rabbi trust were determined by Level 1 quoted market prices for the underlying mutual funds.