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Quarterly Financial Data (Summary Of Quarterly Financial Data) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Quarterly Financial Data [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 491,011 | $ 572,334 | $ 656,327 | $ 526,857 | $ 847,282 | $ 964,114 | $ 1,015,049 | $ 1,019,719 | $ 2,246,529 | $ 3,846,164 | $ 4,134,830
Operating income (loss) | 57,870 | 44,798 | 29,380 | 24,819 | 30,624 | 35,268 | 31,257 | 35,402 | 156,867 | 132,551 | 110,757
Income from continuing operations before income taxes |  |  |  |  |  |  |  |  | 425,572 | 109,047 | 84,849
Income from continuing operations | 26,296 | 363,409 | 11,665 | 20,215 | 26,166 | 29,113 | 21,148 | 29,775 | 421,585 | 106,202 | 84,004
Net Income (Loss) Attributable to Noncontrolling Interest | 1,138 | (195) | 0 | 0 |  |  |  |  | 943 | 0 | 0
Net Income (Loss) Attributable to Parent | $ 27,434 | $ 363,214 | $ 11,665 | $ 20,215 |  |  |  |  | 422,528 | 106,202 | 86,109
Income from discontinued operations |  |  |  |  |  |  |  |  | 0 | 0 | 2,105
Net income (loss) |  |  |  |  | $ 26,166 | $ 29,113 | $ 21,148 | $ 29,775 | $ 421,585 | $ 106,202 | $ 86,109
Income (Loss) from Continuing Operations, Per Outstanding Limited Partnership Unit, Basic, Net of Tax | $ 0.24 | $ 3.38 | $ 0.12 | $ 0.21 | $ 0.28 | $ 0.33 | $ 0.24 | $ 0.34 |  |  |
Net income per common unit-basic and diluted | 0.24 | 3.38 | 0.12 | 0.21 | 0.28 | 0.33 | 0.24 | 0.34 |  |  |
Per Unit Amount | $ 0.6400 | $ 0.6250 | $ 0.6100 | $ 0.5950 | $ 0.5800 | $ 0.5650 | $ 0.5500 | $ 0.5350 | $ 0.6400 | $ 0.5800 |

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