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Derivative Instruments - Additional Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 5 Months Ended 12 Months Ended
Mar. 31, 2012
May 23, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Jun. 30, 2012
$370,000 Credit Facility
Jun. 29, 2012
$370,000 Credit Facility
Dec. 31, 2012
$350,000 Credit Facility
Dec. 31, 2012
Interest Rate Swap
Debt Instrument [Line Items]                  
Number of Interest rate swaps     14            
Number of Partnership's interest rate swaps expired             9    
Number of interest rate swap agreements terminated           1   1  
Number of interest rate swap agreements partially terminated               1  
Interest rate swaps amount held                 $ 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 Partnership' s Consolidated Statements of Comprehensive (Loss) / Income 1,400 50              
Amortization of gain/loss included in Accumulated OCI due to ineffectiveness     1,087            
Change of the fair value of certain swap agreements     $ 1,448 $ 2,310 $ 0