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Disclosures About Fair Value of Financial Instruments (Details) Carrying Values and Estimated Fair Values (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Carrying Amount
   
Financial assets:    
Cash and cash equivalents $ 100,115 $ 99,549
Notes and other receivables, net 10,487 6,669
Financial liabilities:    
Debt 141,008 93,431
Estimated Fair Value
   
Financial assets:    
Cash and cash equivalents 100,115 99,549
Notes and other receivables, net 10,487 6,669
Financial liabilities:    
Debt $ 137,024 $ 93,431