CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Cash flows provided by (used in) operating activities:
Net income	$ 30,490	$ 56,196
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	357,300	351,257
Stock based compensation expense	3,718	3,584
Pension/OPEB costs	12,403	11,279
Other non-cash adjustments	1,537	(2,999)
Deferred income taxes	15,764	27,744
Change in accounts receivable	59,905	30,996
Change in accounts payable and other liabilities	(102,042)	29,469
Change in prepaid expenses, income taxes and other current assets	3,438	6,588
Net cash provided by operating activities	382,513	514,114
Cash flows provided from (used by) investing activities:
Capital expenditures - Business operations	(208,522)	(203,534)
Capital expenditures - Integration activities	(15,731)	(5,578)
Cash transferred from escrow	5,425	3,349
Other assets purchased and distributions received, net	(5,918)	(6,556)
Net cash used by investing activities	(224,746)	(212,319)
Cash flows provided from (used by) financing activities:
Long-term debt payments	(14,502)	(969)
Dividends paid	(99,851)	(186,605)
Repayment of customer advances for construction, distributions to noncontrolling interests and other	(3,694)	(6,102)
Net cash used by financing activities	(118,047)	(193,676)
Increase in cash and cash equivalents	39,720	108,119
Cash and cash equivalents at January 1,	326,094	251,263
Cash and cash equivalents at March 31,	365,814	359,382
Cash paid (received) during the period for:
Interest	118,524	119,067
Income taxes (refunds)	$ (369)	$ 8,946