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Quarterly Financial Data (Summary Of Quarterly Financial Data) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Mar. 31, 2014
Quarterly Financial Data [Abstract]                        
Revenues $ 961,035 $ 1,090,293 $ 1,068,694 $ 1,014,808 $ 919,056 $ 895,023 $ 797,705 $ 755,577 $ 4,134,830 $ 3,367,361 $ 2,437,797  
Operating income (loss) 23,300 24,092 33,360 30,005 30,228 29,236 28,112 27,134 110,757 114,710 82,578  
Income from continuing operations before income taxes                 84,849 88,132 50,154  
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest 16,722 17,966 26,612 22,704 26,992 31,310 19,028 20,007 84,004 97,337 51,371  
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest 1,164 508 290 143 (55) (116) (444) (403) 2,105 (1,018) (122)  
Net income (loss) $ 17,886 $ 18,474 $ 26,902 $ 22,847 $ 26,937 $ 31,194 $ 18,584 $ 19,604 $ 86,109 $ 96,319 $ 51,249  
Income (Loss) from Continuing Operations, Per Outstanding Limited Partnership Unit, Basic, Net of Tax $ 0.19 $ 0.21 $ 0.32 $ 0.28 $ 0.34 $ 0.39 $ 0.24 $ 0.27 $ 1.00 $ 1.24 $ 0.76  
Income (Loss) from Discontinued Operations, Net of Tax, Per Outstanding Limited Partnership Unit, Basic $ 0.01 $ 0.01 $ 0.01 $ 0.00 $ 0.00 $ 0.00 $ (0.01) $ 0.00 $ 0.03 $ (0.01) $ (0.01)  
Net income per common unit-basic and diluted $ 0.20 $ 0.22 $ 0.33 $ 0.28 $ 0.34 $ 0.39 $ 0.23 $ 0.27 $ 1.03 $ 1.23    
Cash distributions per common unit                 $ 2.015000 $ 1.8225000    
Per Unit Amount $ 0.5225 $ 0.5100 $ 0.4975 $ 0.4850 $ 0.4725 $ 0.4600 $ 0.4500 $ 0.4400 $ 0.5225 $ 0.4725   $ 0.5350