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Financial Instruments - Additional Information (Details) (USD $)
In Thousands, unless otherwise specified
 5 Months Ended 6 Months Ended
May 23, 2012
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Credit Facility 370000 [Member]
Jun. 29, 2012
Credit Facility 370000 [Member]
Jun. 30, 2012
Credit Facility 350000 [Member]
Jun. 30, 2012
Interest Rate Swap [Member]
Debt Instrument [Line Items]              
Number of Interest rate swaps     14        
Number of Partnership's interest rate swaps expired         9    
Number of interest rate swaps agreement closed out       1   1  
Number of interest rate swaps agreement closed partially           1  
Derivative amount swapped             $ 59,084
Amount of swap agreement termination   20,500          
Number of swap agreements remaining   3          
Interest rate swap not qualifying as cashflow hedge, amount to be amortized from OCL to Income 50            
Amortization of gain/loss included in Accumulated OCI due to ineffectiveness   13          
Gain from the change in fair value of non-hedging derivatives   8,075          
Change of the fair value of the nine swap agreements   $ 1,447 $ 0