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Acquisition (Schedule of Pro Forma Information) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]        
Net Income (Loss), Per Outstanding Limited Partnership and General Partnership Unit, Basic and Diluted, Net of Tax $ 3.38 $ 0.33 $ 3.93 $ 0.90
Business Acquisition Pro Forma Earnings Per Unit Basic And Diluted $ 3.39 $ 0.39 $ 3.63 $ 0.92
Enterprise Offshore Acquisition        
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]        
Revenues $ 590,994 $ 1,049,349 $ 1,930,978 $ 3,205,331
Net Income $ 372,548 38,573 $ 392,988 91,466
American Phoenix Acquisition [Member]        
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]        
Revenues   969,127   3,013,597
Net Income   $ 30,471   $ 84,022