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

Marketable securities

  $ —       $ —       $ 28,235     $ 28,235  

Secured notes payable

    964,068       1,003,699       943,479       974,273  

Credit facility

    141,000       141,000       —         —    

Deferred compensation liability

    604       604       520       520