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Bank note payable (Details) (USD $)
 6 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Sep. 27, 2012
Bank note and term note payable      
Borrowings outstanding $ 181,500,000 $ 216,750,000  
Weighted average rate interest rate, during period (as a percent) 1.65%    
2012 Credit Facility
      
Bank note and term note payable      
Total available 900,000,000    
Facility fee (as a percent) 0.30%    
2012 Credit Facility | Less than or equal to 25%
      
Bank note and term note payable      
Facility fee (as a percent) 0.20%    
2012 Credit Facility | Greater than 25% to less than or equal to 35%
      
Bank note and term note payable      
Facility fee (as a percent) 0.25%    
2012 Credit Facility | Greater than 35% to less than or equal to 45%
      
Bank note and term note payable      
Facility fee (as a percent) 0.30%    
2012 Credit Facility | Greater than 45% to less than or equal to 55%
      
Bank note and term note payable      
Facility fee (as a percent) 0.35%    
2012 Credit Facility | Greater than 55%
      
Bank note and term note payable      
Facility fee (as a percent) 0.40%    
2012 Credit Facility | Minimum
      
Bank note and term note payable      
Facility fee (as a percent) 0.20%    
2012 Credit Facility | Minimum | Greater than 25% to less than or equal to 35%
      
Bank note and term note payable      
Leverage Ratio 25.00%    
2012 Credit Facility | Minimum | Greater than 35% to less than or equal to 45%
      
Bank note and term note payable      
Leverage Ratio 35.00%    
2012 Credit Facility | Minimum | Greater than 45% to less than or equal to 55%
      
Bank note and term note payable      
Leverage Ratio 45.00%    
2012 Credit Facility | Minimum | Greater than 55%
      
Bank note and term note payable      
Leverage Ratio 55.00%    
2012 Credit Facility | Maximum
      
Bank note and term note payable      
Facility fee (as a percent) 0.40%    
2012 Credit Facility | Maximum | Less than or equal to 25%
      
Bank note and term note payable      
Leverage Ratio 25.00%    
2012 Credit Facility | Maximum | Greater than 25% to less than or equal to 35%
      
Bank note and term note payable      
Leverage Ratio 35.00%    
2012 Credit Facility | Maximum | Greater than 35% to less than or equal to 45%
      
Bank note and term note payable      
Leverage Ratio 45.00%    
2012 Credit Facility | Maximum | Greater than 45% to less than or equal to 55%
      
Bank note and term note payable      
Leverage Ratio 55.00%    
2012 Credit Facility | LIBOR
      
Bank note and term note payable      
Variable base rate LIBOR    
Basis spread on variable rate (as a percent) 1.45%    
Overall rate (basis spread plus variable rate), end of period (as a percent) 1.65%    
2012 Credit Facility | LIBOR | Less than or equal to 25%
      
Bank note and term note payable      
Basis spread on variable rate (as a percent) 1.35%    
2012 Credit Facility | LIBOR | Greater than 25% to less than or equal to 35%
      
Bank note and term note payable      
Basis spread on variable rate (as a percent) 1.40%    
2012 Credit Facility | LIBOR | Greater than 35% to less than or equal to 45%
      
Bank note and term note payable      
Basis spread on variable rate (as a percent) 1.45%    
2012 Credit Facility | LIBOR | Greater than 45% to less than or equal to 55%
      
Bank note and term note payable      
Basis spread on variable rate (as a percent) 1.65%    
2012 Credit Facility | LIBOR | Greater than 55%
      
Bank note and term note payable      
Basis spread on variable rate (as a percent) 1.90%    
2012 Credit Facility | LIBOR | Minimum
      
Bank note and term note payable      
Basis spread on variable rate (as a percent) 1.35%    
2012 Credit Facility | LIBOR | Maximum
      
Bank note and term note payable      
Basis spread on variable rate (as a percent) 1.90%    
2012 Credit Facility | Bank's base rate
      
Bank note and term note payable      
Variable base rate Bank's base rate    
Basis spread on variable rate (as a percent) 0.45%    
Overall rate (basis spread plus variable rate), end of period (as a percent) 3.70%    
2012 Credit Facility | Bank's base rate | Less than or equal to 25%
      
Bank note and term note payable      
Basis spread on variable rate (as a percent) 0.35%    
2012 Credit Facility | Bank's base rate | Greater than 25% to less than or equal to 35%
      
Bank note and term note payable      
Basis spread on variable rate (as a percent) 0.40%    
2012 Credit Facility | Bank's base rate | Greater than 35% to less than or equal to 45%
      
Bank note and term note payable      
Basis spread on variable rate (as a percent) 0.45%    
2012 Credit Facility | Bank's base rate | Greater than 45% to less than or equal to 55%
      
Bank note and term note payable      
Basis spread on variable rate (as a percent) 0.65%    
2012 Credit Facility | Bank's base rate | Greater than 55%
      
Bank note and term note payable      
Basis spread on variable rate (as a percent) 0.90%    
2012 Credit Facility | Bank's base rate | Minimum
      
Bank note and term note payable      
Basis spread on variable rate (as a percent) 0.35%    
2012 Credit Facility | Bank's base rate | Maximum
      
Bank note and term note payable      
Basis spread on variable rate (as a percent) 0.90%    
2012 Credit Facility | Federal funds rate
      
Bank note and term note payable      
Variable base rate Federal Funds Rate    
Basis spread on variable rate (as a percent) 0.50%    
2012 Credit Facility | One month LIBOR
      
Bank note and term note payable      
Variable base rate One month LIBOR    
Basis spread on variable rate (as a percent) 1.00%    
2012 Revolver
      
Bank note and term note payable      
Total available 500,000,000    
Borrowings outstanding 181,500,000 216,750,000 82,000,000
Term of the borrowing 4 years    
Additional borrowing capacity allowed by exercising an accordion feature 250,000,000    
Extension available on debt 12 months    
Overall rate (basis spread plus variable rate), end of period (as a percent)   2.23%  
Weighted average rate interest rate, during period (as a percent) 1.65%    
2012 Term Loan
      
Bank note and term note payable      
Total available 400,000,000    
Borrowings outstanding     400,000,000
Term of the borrowing 5 years    
Overall rate (basis spread plus variable rate), end of period (as a percent) 2.20%    
2012 Term Loan | LIBOR
      
Bank note and term note payable      
Variable base rate LIBOR    
Fixed rate (as a percent) 0.75%    
2011 Revolver
      
Bank note and term note payable      
Total available 600,000,000    
Borrowings outstanding     $ 482,000,000