v3.3.1.900
QUARTERLY FINANCIAL DATA (UNAUDITED) (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 $ 464,919 $ 493,566 $ 570,611 $ 554,944 $ 681,738 $ 794,422 $ 749,745 $ 849,213 $ 2,084,040 $ 3,075,118 $ 3,463,732
Operating income (loss) 98,024 100,994 92,405 99,281 81,346 95,098 89,354 81,103 390,704 346,901 (19,121)
Income (loss) from continuing operations 59,480 65,016 54,325 127,125 54,869 59,117 57,187 42,996 305,946 214,169 (185,509)
Income (loss) from discontinued operations, net of tax 0 0 0 774 (1,475) 2,831 (1,788) (3,359) 774 (3,791) (99,162)
Net income (loss) $ 59,480 $ 65,016 $ 54,325 $ 127,899 $ 53,394 $ 61,948 $ 55,399 $ 39,637 $ 306,720 $ 210,378 $ (284,671)
Net income (loss) per unit applicable to limited partners:                      
Continuing operations $ 0.61 $ 0.68 $ 0.54 $ 1.46 $ 0.55 $ 0.61 $ 0.58 $ 0.40 $ 3.29 $ 2.14 $ (2.89)
Discontinued operations 0.00 0.00 0.00 0.01 (0.01) 0.03 (0.02) (0.04) 0.01 (0.04) (1.11)
Total 0.61 0.68 0.54 1.47 0.54 0.64 0.56 0.36 3.30 2.10 (4.00)
Cash distributions per unit applicable to limited partners $ 1.095 $ 1.095 $ 1.095 $ 1.095 $ 1.095 $ 1.095 $ 1.095 $ 1.095 $ 4.380 $ 4.38 $ 4.38