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Debt and Line of Credit (Details) (USD $)
 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Mortgages
financial_covenants
Apr. 06, 2009
Mortgages
Dec. 31, 2012
Mortgages
Land, buildings and improvements
Dec. 31, 2012
Mortgages
Minimum
Jun. 09, 2011
Mortgages
BBA LIBOR
Maximum
Dec. 31, 2012
Mortgages
BBA LIBOR
Minimum
Dec. 31, 2012
Line of credit
Revolving loan agreement
Dec. 31, 2011
Line of credit
Revolving loan agreement
Dec. 31, 2010
Line of credit
Revolving loan agreement
Dec. 31, 2012
Line of credit
BBA LIBOR daily floating rate
Revolving loan agreement
Dec. 31, 2012
Term loan
Loans
Dec. 31, 2012
Term loan
BBA LIBOR daily floating rate
Debt Instrument [Line Items]                            
Debt instrument, face amount       $ 4,000,000                    
Debt instrument, maturity term     10 years                      
Debt instrument, principal amortization term     20 years                      
Debt instrument, basis spread on variable rate             2.25% 2.00%       1.25%   1.75%
Debt instrument, collateral amount         4,362,000                  
Monthly repayments of long-term debt, principal and interest     0                      
Annual increase in repayments of long-term debt, principal and interest     0                      
Number of financial covenants     1                      
Debt instrument, restrictive covenant, fixed charge coverage ratio, amount           25,000,000                
Long-term Debt, Fiscal Year Maturity [Abstract]                            
2013     138,000                      
2014     146,000                      
2015     154,000                      
2016     163,000                      
2017     172,000                      
Long-term Debt, Maturities, Repayments of Principal after Year Five     2,780,000                      
Thereafter     2,551,000                      
Total outstanding at December 31, 2012     3,553,000                      
Line of credit facility, current borrowing capacity                 15,000,000          
Debt instrument, restrictive covenant, unencombered liquid assets, amount                 20,000,000          
Debt conversion, original debt, loan conversion option amount                         12,000,000  
Number of loans                         1  
Debt instument, termination notice period                           30 days
Line of credit 7,000,000 9,000,000                        
Line of credit facility, commitment fee amount                 $ 27,000 $ 49,000 $ 49,000