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Fair Value Measurements and Disclosures (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Assets and Liabilities Reported at Fair Value      
Marketable securities $ 8,029   $ 7,435
Fair value adjustment of marketable securities and deferred compensation plan liability      
Net gain (loss) on marketable securities 356 435  
Fair Value (Level 1) [Member]
     
Assets and Liabilities Reported at Fair Value      
Marketable securities $ 8,029 [1],[2]   $ 7,435 [1],[2]
[1] The marketable securities are held in a limited rabbi trust.
[2] Based on quoted prices in active markets for identical securities.