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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Operating activities    
Net income $ 548,228 $ 362,176
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 210,525 200,268
Noncash contribution of preferred stock, net of tax 0 12,600
Equity in net earnings from investments (76,757) (78,927)
Distributions received from unconsolidated affiliates 84,652 81,744
Deferred Income Tax Expense (Benefit) 161,602 90,685
Share-based compensation expense 16,071 13,477
Pension and postretirement benefit expense, net of contributions (5,096) (1,576)
Allowance for equity funds used during construction (1,034) (35)
Gain on sale of assets (185) (630)
Changes in assets and liabilities:    
Accounts receivable 268,287 123,085
Natural gas and natural gas liquids in storage 49,347 (60,099)
Accounts payable (282,572) (134,334)
Commodity imbalances, net (15,873) (6,134)
Risk-management assets and liabilities 72,580 66,940
Other assets and liabilities, net (26,805) (26,349)
Cash provided by operating activities 1,002,970 642,891
Investing activities    
Capital expenditures (less allowance for equity funds used during construction) (615,352) (195,232)
Contributions to unconsolidated affiliates (294) (4,653)
Distributions received from unconsolidated affiliates in excess of cumulative earnings 13,588 14,936
Proceeds from sale of assets 657 1,218
Cash used in investing activities (601,401) (183,731)
Financing activities    
Dividends paid (643,493) (259,758)
Distributions to noncontrolling interests (3,000) (273,460)
Borrowing (repayment) of short-term borrowings, net (458,673) 164,130
Repayment of long-term debt (503,825) (3,898)
Issuance of common stock 1,186,718 10,845
Other, net (1,194) (13,523)
Cash used in financing activities (423,467) (375,664)
Change in cash and cash equivalents (21,898) 83,496
Cash and cash equivalents at beginning of period 37,193 248,875
Cash and cash equivalents at end of period $ 15,295 $ 332,371