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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating activities      
Net income $ 1,155,032 $ 593,519 $ 743,499
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 428,557 406,335 391,585
Impairment charges 0 20,240 0
Noncash contribution of preferred stock, net of tax 0 12,600 0
Equity in net earnings from investments (158,383) (159,278) (139,690)
Distributions received from unconsolidated affiliates 170,528 167,372 144,673
Deferred income taxes 361,010 437,917 211,638
Share-based compensation expense 31,664 26,262 40,563
Pension and postretirement benefit expense, net of contributions 469 4,079 11,643
Allowance for equity funds used during construction (7,962) (107) (209)
Gain on sale of assets (601) (924) (9,635)
Changes in assets and liabilities:      
Accounts receivable 383,993 (330,521) (285,806)
Natural gas and natural gas liquids in storage 38,456 (202,259) (11,950)
Accounts payable (320,132) 261,305 287,632
Commodity imbalances, net (44,302) 43,699 45,971
Accrued interest 26,068 22,795 (16,529)
Risk-management assets and liabilities 117,717 37,617 (78,136)
Other assets and liabilities, net 4,605 (25,239) 17,971
Cash provided by operating activities 2,186,719 1,315,412 1,353,220
Investing activities      
Capital expenditures (less allowance for equity funds used during construction) (2,141,475) (512,393) (624,634)
Contributions to unconsolidated affiliates (1,748) (87,861) (68,275)
Distributions received from unconsolidated affiliates in excess of cumulative earnings 26,757 28,742 52,044
Proceeds from sale of assets 1,578 3,879 25,420
Cash used in investing activities (2,114,888) (567,633) (615,445)
Financing activities      
Dividends paid (1,335,058) (829,414) (517,601)
Distributions to noncontrolling interests (3,500) (276,260) (549,419)
Borrowing (repayment) of short-term borrowings, net (614,673) (495,604) 563,937
Issuance of long-term debt, net of discounts 1,795,773 1,190,496 1,000,000
Debt financing costs (13,441) (11,425) (2,770)
Repayment of long-term debt (932,650) (994,776) (1,108,040)
Issuance of common stock 1,203,981 471,358 21,971
Acquisition of noncontrolling interests (195,000) 0 0
Other, net (2,481) (13,836) 5,403
Cash used in financing activities (97,049) (959,461) (586,519)
Change in cash and cash equivalents (25,218) (211,682) 151,256
Cash and cash equivalents at beginning of period 37,193 248,875 97,619
Cash and cash equivalents at end of period 11,975 37,193 248,875
Supplemental cash flow information:      
Cash paid for interest, net of amounts capitalized 418,244 432,210 461,208
Cash paid for income taxes $ 2,225 $ 6,633 $ 361