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SEGMENTS (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Segment disclosure [Abstract]          
Segment Reporting, Disclosure of Major Customers For the three months ended June 30, 2018, we had no single customer from which we received 10 percent or more of our consolidated revenues. For the three months ended June 30, 2017, we had no single customer from which we received 10 percent or more of our consolidated revenues. For the six months ended June 30, 2018, we had no single customer from which we received 10 percent or more of our consolidated revenues. For the six months ended June 30, 2017, we had no single customer from which we received 10 percent or more of our consolidated revenues.  
Revenues $ 2,960,529 $ 2,725,772 $ 6,062,606 $ 5,475,383  
Cost of sales and fuel (exclusive of depreciation and operating costs) (2,175,818) (2,091,022) (4,543,844) (4,234,865)  
Operating costs (230,153) (215,088) (440,357) (404,293)  
Equity in net earnings (loss) from investments 36,570 39,363 76,757 78,927  
Depreciation and amortization (106,288) (100,849) (210,525) (200,268)  
Total assets 16,913,720 16,672,923 16,913,720 16,672,923 $ 16,845,937
Capital expenditures 350,885 82,495 615,352 195,232  
Net income 282,179 175,991 548,228 362,176  
Interest expense, net of capitalized interest 113,496 118,473 229,221 234,935  
Income taxes 87,531 43,844 163,302 98,785  
Noncash compensation expense 12,140 3,260 21,366 4,907  
Other corporate costs and noncash items 2,659 39,813 (2,094) 46,313  
Noncash Contribution Expense     0 12,600  
Business Combination, Acquisition Related Costs   22,800   29,500  
Series E Preferred Stock [Member]          
Segment disclosure [Abstract]          
Noncash Contribution Expense   20,000      
Natural Gas Gathering And Processing [Member]          
Segment disclosure [Abstract]          
Revenues 700,929 685,815 1,408,920 1,347,091  
Cost of sales and fuel (exclusive of depreciation and operating costs) (442,959) (488,891) (935,581) (977,275)  
Operating costs (93,602) (72,659) (181,961) (143,987)  
Equity in net earnings (loss) from investments (794) 3,780 874 6,410  
Noncash compensation expense and other 3,292 216 5,165 (11)  
Segment adjusted EBITDA 166,866 128,261 297,417 232,228  
Depreciation and amortization (48,149) (46,033) (95,897) (91,001)  
Total assets 5,585,519 5,310,946 5,585,519 5,310,946  
Capital expenditures 108,842 37,020 220,571 100,171  
Natural Gas Gathering And Processing [Member] | Natural Gas Gathering and Processing Intersegment [Member]          
Segment disclosure [Abstract]          
Revenues 448,500   846,300    
Natural Gas Liquids [Member]          
Segment disclosure [Abstract]          
Revenues 2,613,930 2,349,685 5,306,399 4,741,669  
Cost of sales and fuel (exclusive of depreciation and operating costs) (2,183,512) (2,003,601) (4,464,584) (4,052,294)  
Operating costs (99,610) (86,977) (188,202) (165,417)  
Equity in net earnings (loss) from investments 16,582 15,062 33,006 28,784  
Noncash compensation expense and other 4,671 (860) 7,521 (1,204)  
Segment adjusted EBITDA 352,061 273,309 694,140 551,538  
Depreciation and amortization (42,878) (41,427) (85,305) (82,542)  
Total assets 8,898,255 8,168,567 8,898,255 8,168,567  
Capital expenditures 216,934 12,336 341,855 32,789  
Natural Gas Liquids [Member] | Natural Gas Liquids Intersegment [Member]          
Segment disclosure [Abstract]          
Revenues 3,700   12,700    
Natural Gas Liquids [Member] | Natural Gas Liquids Regulated [Member]          
Segment disclosure [Abstract]          
Revenues 294,300 289,400 594,300 585,700  
Cost of sales and fuel (exclusive of depreciation and operating costs) (124,000) (118,900) (246,800) (235,400)  
Natural Gas Pipelines [Member]          
Segment disclosure [Abstract]          
Revenues 99,792 97,849 209,703 204,667  
Cost of sales and fuel (exclusive of depreciation and operating costs) (2,637) (6,773) (8,091) (23,376)  
Operating costs (34,959) (30,682) (68,149) (62,245)  
Equity in net earnings (loss) from investments 20,782 20,521 42,877 43,733  
Noncash compensation expense and other 2,388 (255) 2,651 839  
Segment adjusted EBITDA 85,366 80,660 178,991 163,618  
Depreciation and amortization (14,426) (12,598) (27,695) (25,141)  
Total assets 2,073,043 1,951,423 2,073,043 1,951,423  
Capital expenditures 20,477 26,846 40,375 51,860  
Natural Gas Pipelines [Member] | Natural Gas Pipelines Intersegment [Member]          
Segment disclosure [Abstract]          
Revenues 2,500   4,600    
Natural Gas Pipelines [Member] | Natural Gas Pipelines Regulated [Member]          
Segment disclosure [Abstract]          
Revenues 64,500 62,800 132,500 131,700  
Cost of sales and fuel (exclusive of depreciation and operating costs) (5,800) (8,300) (14,900) (22,400)  
Total Segments [Member]          
Segment disclosure [Abstract]          
Revenues 3,414,651 3,133,349 6,925,022 6,293,427  
Cost of sales and fuel (exclusive of depreciation and operating costs) (2,629,108) (2,499,265) (5,408,256) (5,052,945)  
Operating costs (228,171) (190,318) (438,312) (371,649)  
Equity in net earnings (loss) from investments 36,570 39,363 76,757 78,927  
Noncash compensation expense and other 10,351 (899) 15,337 (376)  
Segment adjusted EBITDA 604,293 482,230 1,170,548 947,384  
Depreciation and amortization (105,453) (100,058) (208,897) (198,684)  
Total assets 16,556,817 15,430,936 16,556,817 15,430,936  
Capital expenditures 346,253 76,202 602,801 184,820  
Other and Eliminations          
Segment disclosure [Abstract]          
Revenues (454,122) (407,577) (862,416) (818,044)  
Cost of sales and fuel (exclusive of depreciation and operating costs) 453,290 408,243 864,412 818,080  
Operating costs (1,982) (24,770) (2,045) (32,644)  
Equity in net earnings (loss) from investments 0 0 0 0  
Depreciation and amortization (835) (791) (1,628) (1,584)  
Total assets 356,903 1,241,987 356,903 1,241,987  
Capital expenditures 4,632 6,293 12,551 10,412  
Unaffiliated entity [Member]          
Segment disclosure [Abstract]          
Revenues   2,725,772   5,475,383  
Unaffiliated entity [Member] | Natural Gas Gathering And Processing [Member]          
Segment disclosure [Abstract]          
Revenues   433,088   833,237  
Unaffiliated entity [Member] | Natural Gas Liquids [Member]          
Segment disclosure [Abstract]          
Revenues   2,196,399   4,440,399  
Unaffiliated entity [Member] | Natural Gas Pipelines [Member]          
Segment disclosure [Abstract]          
Revenues   95,755   200,679  
Unaffiliated entity [Member] | Total Segments [Member]          
Segment disclosure [Abstract]          
Revenues   2,725,242   5,474,315  
Unaffiliated entity [Member] | Other and Eliminations          
Segment disclosure [Abstract]          
Revenues   530   1,068  
Operating Segments [Member]          
Segment disclosure [Abstract]          
Revenues   0   0  
Operating Segments [Member] | Natural Gas Gathering And Processing [Member]          
Segment disclosure [Abstract]          
Revenues   252,727   513,854  
Operating Segments [Member] | Natural Gas Liquids [Member]          
Segment disclosure [Abstract]          
Revenues   153,286   301,270  
Operating Segments [Member] | Natural Gas Liquids [Member] | Natural Gas Liquids Regulated [Member]          
Segment disclosure [Abstract]          
Revenues 255,000 249,400 508,400 502,300  
Operating Segments [Member] | Natural Gas Pipelines [Member]          
Segment disclosure [Abstract]          
Revenues   2,094   3,988  
Operating Segments [Member] | Total Segments [Member]          
Segment disclosure [Abstract]          
Revenues   408,107   819,112  
Operating Segments [Member] | Other and Eliminations          
Segment disclosure [Abstract]          
Revenues   $ (408,107)   $ (819,112)  
Noncustomer [Domain]          
Segment disclosure [Abstract]          
Revenues (5,400)   (14,400)    
NGL and Condensate Sales [Member]          
Segment disclosure [Abstract]          
Revenues 2,468,800   5,025,817    
NGL and Condensate Sales [Member] | Natural Gas Gathering And Processing [Member]          
Segment Reporting Information [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 447,839   860,996    
NGL and Condensate Sales [Member] | Natural Gas Liquids [Member]          
Segment Reporting Information [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 2,469,517   5,022,287    
NGL and Condensate Sales [Member] | Natural Gas Pipelines [Member]          
Segment Reporting Information [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 0   0    
NGL and Condensate Sales [Member] | Total Segments [Member]          
Segment Reporting Information [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 2,917,356   5,883,283    
NGL and Condensate Sales [Member] | Other and Eliminations          
Segment disclosure [Abstract]          
Revenues (448,556)   (857,466)    
Residue Natural Gas Sales [Member]          
Segment disclosure [Abstract]          
Revenues 205,769   467,935    
Residue Natural Gas Sales [Member] | Natural Gas Gathering And Processing [Member]          
Segment Reporting Information [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 208,618   463,615    
Residue Natural Gas Sales [Member] | Natural Gas Liquids [Member]          
Segment Reporting Information [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 0   0    
Residue Natural Gas Sales [Member] | Natural Gas Pipelines [Member]          
Segment Reporting Information [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 179   5,098    
Residue Natural Gas Sales [Member] | Total Segments [Member]          
Segment Reporting Information [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 208,797   468,713    
Residue Natural Gas Sales [Member] | Other and Eliminations          
Segment disclosure [Abstract]          
Revenues (3,028)   (778)    
Gathering and Exchange Services Revenue [Member]          
Segment disclosure [Abstract]          
Revenues 139,271   260,937    
Gathering and Exchange Services Revenue [Member] | Natural Gas Gathering And Processing [Member]          
Segment Reporting Information [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 42,801   81,230    
Gathering and Exchange Services Revenue [Member] | Natural Gas Liquids [Member]          
Segment Reporting Information [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 96,470   179,728    
Gathering and Exchange Services Revenue [Member] | Natural Gas Pipelines [Member]          
Segment Reporting Information [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 0   0    
Gathering and Exchange Services Revenue [Member] | Total Segments [Member]          
Segment Reporting Information [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 139,271   260,958    
Gathering and Exchange Services Revenue [Member] | Other and Eliminations          
Segment disclosure [Abstract]          
Revenues 0   (21)    
Transportation and Storage Revenue [Member]          
Segment disclosure [Abstract]          
Revenues 135,794   285,516    
Transportation and Storage Revenue [Member] | Natural Gas Gathering And Processing [Member]          
Segment Reporting Information [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 0   0    
Transportation and Storage Revenue [Member] | Natural Gas Liquids [Member]          
Segment Reporting Information [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 45,012   98,490    
Transportation and Storage Revenue [Member] | Natural Gas Pipelines [Member]          
Segment Reporting Information [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 93,277   191,615    
Transportation and Storage Revenue [Member] | Total Segments [Member]          
Segment Reporting Information [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 138,289   290,105    
Transportation and Storage Revenue [Member] | Other and Eliminations          
Segment disclosure [Abstract]          
Revenues (2,495)   (4,589)    
Other [Member]          
Segment disclosure [Abstract]          
Revenues 10,895   22,401    
Other [Member] | Natural Gas Gathering And Processing [Member]          
Segment disclosure [Abstract]          
Revenues 1,671   3,079    
Other [Member] | Natural Gas Liquids [Member]          
Segment disclosure [Abstract]          
Revenues 2,931   5,894    
Other [Member] | Natural Gas Pipelines [Member]          
Segment disclosure [Abstract]          
Revenues 6,336   12,990    
Other [Member] | Total Segments [Member]          
Segment disclosure [Abstract]          
Revenues 10,938   21,963    
Other [Member] | Other and Eliminations          
Segment disclosure [Abstract]          
Revenues $ (43)   $ 438