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Selected Quarterly Financial Data (Details) (USD $)
In Thousands, unless otherwise specified
 2 Months Ended 3 Months Ended 10 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Nov. 05, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Selected Quarterly Financial Data [Abstract]                          
Tax benefit from conversion to Partnership                     $ 18,534    
Revenue, Net 111,208 249,216 271,806 262,480 239,084 187,000 199,825 198,158 159,096 911,378 1,022,586 744,079 504,408
Operating Income (Loss) 8,970 7,791 6,072 3,935 4,919 4,707 5,754 3,112 6,448 13,747 22,717 20,021 17,753
Net income   26,092 2,968 2,488 2,511 3,488 3,400 2,001 3,758   34,059 12,647 10,087
Net Income (Loss) Allocated to Limited Partners                     $ 8,242    
Net Income (Loss), Per Outstanding Limited Partnership Unit, Basic                     0.34    
Net Income (Loss) per Subordinated unit (basic and diluted)                     0.34