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Long-Term Debt (Details) (USD $)
In Thousands, unless otherwise specified
 0 Months Ended 6 Months Ended 2 Months Ended 1 Months Ended 6 Months Ended 5 Months Ended 6 Months Ended 5 Months Ended 5 Months Ended 6 Months Ended 0 Months Ended 5 Months Ended 6 Months Ended
Jun. 06, 2012
Jun. 30, 2012
Jun. 30, 2011
Apr. 04, 2012
$370,000 Credit Facility (i)
Feb. 15, 2012
$370,000 Credit Facility (i)
Jun. 30, 2012
$370,000 Credit Facility (i)
May 23, 2012
$350,000 Credit Facility (ii)
Jun. 30, 2012
$350,000 Credit Facility (ii)
May 23, 2012
$25,000 Credit Facility (iii)
Jun. 30, 2012
$25,000 Credit Facility (iii)
May 23, 2012
All three Credit Facilities
May 23, 2012
$370,000 Term Loan
Jun. 30, 2012
$370,000 Term Loan
Jun. 06, 2012
Repayment of Debt
May 23, 2012
Repayment of Debt - Cash used from Cash and Cash Equivalents
Jun. 30, 2012
Long-Term Debt
Jun. 30, 2011
Long-Term Debt
Debt Instrument [Line Items]                                  
Repayment of credit facility   $ 170,066 $ 0 $ 10,500 $ 10,000           $ 149,566       $ 13,141    
Line of credit facility, maximum borrowing capacity           370,000   350,000   25,000              
Repayment of debt - Net proceeds from issuance of preferred units 136,425 136,425 1,470                     136,425      
Margin of the credit facility           2.00%   3.00%                  
Debt's original amount                         370,000        
Cancellation of undrawn tranche             52,500                    
Number of installments             9   9     6          
Quarterly periodic repayments             8,069   1,000     12,975          
Weighted average interest rate                               3.14%  
Interest expense on long term debt   $ 18,929 $ 16,469                         $ 18,379 $ 15,717