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Bank note payable and term note payable (Details) (USD $)
 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
Revolver
Dec. 31, 2010
Revolver
Y
option
Dec. 31, 2010
Revolver
LIBOR
Feb. 22, 2011
Revolver
LIBOR
Dec. 31, 2011
Revolver
Bank's base rate
May 31, 2011
New Revolver
Dec. 31, 2011
New Revolver
Y
Feb. 22, 2011
New Revolver
Dec. 31, 2011
New Revolver
Minimum
Dec. 31, 2011
New Revolver
Maximum
Dec. 31, 2011
New Revolver
LIBOR
Dec. 31, 2011
New Revolver
LIBOR
Minimum
Dec. 31, 2011
New Revolver
LIBOR
Maximum
Dec. 31, 2011
New Revolver
Bank's base rate
Dec. 31, 2011
New Revolver
Bank's base rate
Minimum
Dec. 31, 2011
New Revolver
Bank's base rate
Maximum
Dec. 31, 2011
Term Loan
Y
option
Dec. 31, 2010
Term Loan
Y
option
Dec. 31, 2011
Term Loan
LIBOR
Feb. 22, 2011
Term Loan
LIBOR
Bank note and term note payable                                            
Total available       $ 250,000,000         $ 600,000,000 $ 500,000,000                        
Additional borrowing capacity allowed by exercising an accordion feature               100,000,000                            
Number of options for extension       2                               2    
Extension available on debt (in years)       1         1                     1    
Unsecured term loan   74,850,000                                   75,000,000    
Financial covenant, minimum operating cash       1,500,000                               1,500,000    
Basis spread on variable rate (as a percent)           1.00%             1.95% 1.85% 3.00% 0.95% 0.85% 2.00%       2.00%
Facility fee (as a percent)                 0.35%   0.30% 0.50%                    
Overall rate (basis spread plus variable rate), end of period (as a percent)                         2.30%     4.20%            
Borrowings outstanding $ 449,000,000 $ 209,968,000   $ 209,968,000         $ 449,000,000                          
Weighted average interest rate, end of period (as a percent)       1.26%         2.24%                          
Weighted average rate interest rate, during period (as a percent)     1.95% 1.33%         1.95%                          
Variable base rate         LIBOR   Bank's prime rate           LIBOR     Bank's base rate         LIBOR  
Minimum interest rate (as as percent)                                         2.00%  
Initial term of the borrowing (in years)                                     3      
Fixed interest rate pursuant to interest rate swap contract (as a percent) 5.84%