v2.4.0.6
Obligations (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 1996
Dec. 31, 2010
Debt Instrument [Line Items]      
Mortgage debt $ 180,000   $ 468,000
Senior Notes 230,000,000   0
Debt Instrument, Unamortized Discount (37,471,000)   0
Long-term Debt 192,709,000   468,000
Long-term Debt, Current Maturities 180,000   288,000
Long-term debt obligations 192,529,000   180,000
Real Estate Investments, Other   3,700,000  
Payments to Acquire Buildings   900,000  
Mortgage Loans on Real Estate, Face Amount of Mortgages   2,800,000  
Mortgage Loans on Real Estate, Interest Rate 8.28%    
Land and Building Carrying Amount 7,997,000   8,344,000
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 180,000    
2013 - Long Term Debt Maturities 0    
2014 - Long Term Debt Maturities 0    
2015 - Long Term Debt Maturities 0    
2016 - Long Term Debt Maturities 230,000,000    
Thereafter - Long Term Debt Maturities 0    
Total debt obligations 230,180,000    
Land and Building [Member]
     
Debt Instrument [Line Items]      
Land and Building Carrying Amount $ 2,600,000