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Investments
 6 Months Ended
Jun. 30, 2012
Investments [Abstract]  
Investments
9. Investments

The investment balance at June 30, 2012, represents: (a) a Rabbi Trust associated with our Supplemental Executive Retirement Savings Plan, (b) a Rabbi Trust related to the deferral of certain director compensation, and (c) investments in equity securities. We classify these investments as trading securities and report them at their fair value. We recorded $185,000 and $502,000, for an unrealized gain, net of other expenses, in other income in the consolidated statements of income for the three and six months ended June 30, respectively. We also have recorded an associated liability that is adjusted each month for the gains and losses incurred by the Rabbi Trusts. At June 30, 2012 and December 31, 2011, total investments had a fair value of $4.7 million and $4.0 million, respectively.