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Fair Value of Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2012
Fair Value of Financial Instruments [Abstract]  
Carrying amount and fair value of financial instruments
                                 
    June 30, 2012     December 31, 2011  
    Carrying Value     Fair Value     Carrying Value     Fair Value  

Marketable securities

  $ 24,287     $ 24,287     $ 28,235     $ 28,235  

Secured notes payable

    964,538       987,944       943,479       974,273  

Deferred compensation liability

  $ 571     $ 571     $ 520     $ 520