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Long-term debt (Details) (USD $)
 6 Months Ended 1 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended 12 Months Ended 1 Months Ended 1 Months Ended 12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
May 31, 2011
New Credit Agreement
Jun. 30, 2012
New Credit Agreement
quater
Dec. 31, 2011
New Credit Agreement
Jun. 30, 2012
New Credit Agreement
LIBOR
Maximum
Jun. 30, 2012
New Credit Agreement
Base rate
Maximum
Jun. 30, 2012
Revolving Credit Facility
May 31, 2012
Revolving Credit Facility
Aug. 31, 2010
Revolving Credit Facility
Y
Jun. 30, 2012
Revolving Credit Facility
Dec. 31, 2011
Revolving Credit Facility
Aug. 30, 2010
Revolving Credit Facility
Jun. 30, 2012
Revolving Credit Facility
LIBOR
Dec. 31, 2011
Revolving Credit Facility
LIBOR
Dec. 31, 2011
Revolving Credit Facility
Base rate
May 31, 2012
Term Loan Facility
Aug. 31, 2010
Term Loan Facility
Y
Dec. 31, 2011
Term Loan Facility
Dec. 31, 2011
Term Loan Facility
LIBOR
Long-term debt                                          
Debt instrument term (in years)                     5               5    
Maximum borrowing capacity                           $ 200,000,000              
Maximum borrowing capacity                                     100,000,000    
Repayment of debt obligation                 20,000,000 57,500,000                      
Repayment of debt obligation 168,695,000 2,500,000                               87,500,000      
Amount outstanding 500,000   1,300,000           40,000,000     40,000,000 117,400,000                
Amount outstanding 40,000,000   191,195,000                                 91,300,000  
Variable rate basis                       LIBOR LIBOR   one month LIBOR rate of 0.25%         LIBOR  
Margin on variable rate (as a percent)             3.25% 2.25%             3.00% 3.00% 2.00%       3.00%
Maximum additional borrowing capacity available         50,000,000                                
Preceding number of quarters in which consolidated leverage ratio is measured         4                                
Portion of credit facility charged at variable rate                               100,000,000 17,400,000        
Effective interest rate (as a percent)         3.30% 3.40%                              
Specified settlement amounts excluded from EBITDA under amended agreement       50,000,000                                  
Amount of restricted net assets 200,000,000   186,000,000                                    
Restricted cash 72,913,000   45,476,000                                    
Debt issuance costs incurred         5,000,000                                
Write-off of debt issue costs                                   800,000      
Deferred debt issuance costs, net         $ 2,100,000 $ 3,500,000