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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 |  |

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