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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Operating activities      
Net income $ 1,278,577 $ 1,155,032 $ 593,519
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 476,535 428,557 406,335
Impairment charges 0 0 20,240
Noncash contribution of preferred stock, net of tax 0 0 12,600
Equity in net earnings from investments (154,541) (158,383) (159,278)
Distributions received from unconsolidated affiliates 163,476 170,528 167,372
Deferred Income Tax Expense (Benefit) 372,729 361,010 445,317
Deferred income taxes     437,917
Share-based compensation expense 37,147 31,664 26,262
Allowance for equity funds used during construction (64,815) (7,962) (107)
Other, net 1,567 (132) 3,155
Changes in assets and liabilities:      
Accounts receivable (19,688) 383,993 (330,521)
Natural gas and NGLs in storage (8,259) 38,456 (202,259)
Accounts payable (62,946) (320,132) 261,305
Commodity imbalances, net (1,934) (44,302) 43,699
Accrued interest 29,373 26,068 22,795
Risk-management assets and liabilities (86,268) 117,717 37,617
Other assets and liabilities, net (14,174) 4,605 (25,239)
Cash provided by operating activities 1,946,779 2,186,719 1,315,412
Investing activities      
Capital expenditures (less allowance for equity funds used during construction) (3,848,349) (2,141,475) (512,393)
Contributions to unconsolidated affiliates (4,028) (1,748) (87,861)
Distributions received from unconsolidated affiliates in excess of cumulative earnings 94,168 26,757 28,742
Other, net (10,549) 1,578 3,879
Cash used in investing activities (3,768,758) (2,114,888) (567,633)
Financing activities      
Dividends paid (1,457,628) (1,335,058) (829,414)
Distributions to noncontrolling interests 0 (3,500) (276,260)
Borrowing (repayment) of short-term borrowings, net 220,000 (614,673) (495,604)
Issuance of long-term debt, net of discounts 4,185,435 1,795,773 1,190,496
Debt financing costs (29,747) (13,441) (11,425)
Repayment of long-term debt (1,057,348) (932,650) (994,776)
Issuance of common stock 29,040 1,203,981 471,358
Acquisition of noncontrolling interests 0 (195,000) 0
Other, net (58,790) (2,481) (13,836)
Cash provided by (used in) financing activities 1,830,962 (97,049) (959,461)
Change in cash and cash equivalents 8,983 (25,218) (211,682)
Cash and cash equivalents at beginning of period 11,975 37,193 248,875
Cash and cash equivalents at end of period 20,958 11,975 37,193
Supplemental cash flow information:      
Cash paid for interest, net of amounts capitalized 435,165 418,244 432,210
Cash paid for income taxes, net of refunds $ 2,690 $ 2,225 $ 6,633