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Bank note payable and term note payable (Details) (USD $)
 1 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Dec. 31, 2010
Revolver
May 31, 2011
New Revolver
Jun. 30, 2012
New Revolver
Y
Dec. 31, 2011
New Revolver
Feb. 22, 2011
New Revolver
Jun. 30, 2012
New Revolver
Minimum
Jun. 30, 2012
New Revolver
Maximum
Jun. 30, 2012
New Revolver
LIBOR
Jun. 30, 2012
New Revolver
LIBOR
Minimum
Jun. 30, 2012
New Revolver
LIBOR
Maximum
Jun. 30, 2012
New Revolver
Bank's base rate
Jun. 30, 2012
New Revolver
Bank's base rate
Minimum
Jun. 30, 2012
New Revolver
Bank's base rate
Maximum
Jun. 30, 2012
Term Loan
Y
Dec. 31, 2010
Term Loan
Y
option
Jun. 30, 2012
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  
Extension available on debt (in years)         1                       1  
Unsecured term loan                                 75,000,000  
Financial covenant, minimum operating cash     1,500,000                              
Basis spread on variable rate (as a percent)                   2.10% 1.85% 3.00% 1.10% 0.85% 2.00%     2.00%
Facility fee (as a percent)         0.40%     0.30% 0.50%                  
Overall rate (basis spread plus variable rate), end of period (as a percent)           2.24%       2.35%     4.35%          
Borrowings outstanding $ 494,000,000 $ 449,000,000     $ 494,000,000 $ 449,000,000                        
Weighted average interest rate, end of period (as a percent)         2.34%                          
Weighted average rate interest rate, during period (as a percent)         2.28% 1.95%                        
Variable base 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%