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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Operating Activities      
Net income $ 743,530 $ 759,744 $ 541,330
Depreciation and amortization 335,852 312,288 307,317
Impairment of goodwill 10,255 0 0
Gain on sale of discontinued operations (13,517) 0 0
Equity earnings from investments (123,024) (127,246) (101,880)
Distributions received from unconsolidated affiliates 120,442 132,741 96,958
Deferred income taxes 229,398 256,688 142,303
Share-based compensation expense 36,692 66,371 24,372
Allowance for equity funds used during construction (13,648) (2,335) (1,018)
Loss (gain) on sale of assets (6,736) 963 (18,619)
Other 27,982 (1,471) 4,153
Changes in assets and liabilities:      
Accounts receivable (14,774) (55,861) 92,469
Gas and natural gas liquids in storage 33,343 65,845 (164,722)
Accounts payable (30,981) 102,621 (43,883)
Commodity imbalances, net 43,471 (54,886) (15,316)
Energy marketing and risk management assets and liabilities (174,953) (31,999) 112,827
Fair value of firm commitments (6,003) (22,252) (105,084)
Pension and postretirement benefits (57,073) (29,863) (68,719)
Other assets and liabilities (149,313) (11,376) 31,554
Cash provided by operating activities 990,943 1,359,972 834,042
Investing Activities      
Capital expenditures (less allowance for equity funds used during construction) (1,866,153) (1,336,067) (582,748)
Proceeds from sale of discontinued operations, net of cash sold 32,946 0 0
Contributions to unconsolidated affiliates (30,768) (64,491) (1,331)
Distributions received from unconsolidated affiliates 35,299 23,644 17,847
Proceeds from sale of assets 12,240 1,288 428,908
Other 2,237 4,000 2,968
Cash used in investing activities (1,814,199) (1,371,626) (134,356)
Financing Activities      
Borrowing (repayment) of notes payable, net (24,812) 285,127 (325,015)
Issuance of debt, net of discounts 1,994,693 1,295,450 0
Long-term debt financing costs (15,036) (10,986) 0
Repayment of debt (361,464) (727,562) (262,715)
Repurchase of common stock (150,000) (300,108) (7)
Issuance of common stock 15,969 17,906 20,912
Issuance of common units, net of issuance costs 459,587 0 322,701
Dividends paid (261,969) (227,020) (193,542)
Distributions to noncontrolling interests (324,906) (277,375) (260,385)
Cash provided by (used in) financing activities 1,332,062 55,432 (698,051)
Change in cash and cash equivalents 508,806 43,778 1,635
Change in cash and cash equivalents included in discontinued operations 8,859 (8,166) (2,211)
Change in cash and cash equivalents from continuing operations 517,665 35,612 (576)
Cash and cash equivalents at beginning of period 65,953 30,341 30,917
Cash and cash equivalents at end of period 583,618 65,953 30,341
Supplemental cash flow information:      
Cash paid for interest, net of amounts capitalized 439,398 278,162 298,354
Cash paid (refunds received) for income taxes $ 872 $ (68,696) $ 16,841