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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

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