Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013		Dec. 31, 2012		Jun. 30, 2012
Current assets:
Cash and cash equivalents	$ 114,971		$ 49,042		$ 101,643
Receivables, net	734,765		678,123		654,609
Inventories	345,885		317,415		333,392
Deferred income taxes	27,959		22,846		21,451
Commodity derivative instruments	9,797		18,304		37,000
Prepayments and other current assets	58,870		42,351		85,729
Total current assets	1,292,247		1,128,081		1,233,824
Investments	106,508		103,243		99,343
Property, plant and equipment	8,454,204		8,107,751		8,068,177
Less accumulated depreciation, depletion and amortization	3,709,679		3,608,912		3,478,118
Net property, plant and equipment	4,744,525		4,498,839		4,590,059
Deferred charges and other assets:
Goodwill	636,039	[1]	636,039	[1]	635,389	[1]
Other intangible assets, net	15,312		17,129		18,656
Other	297,040		299,160		324,299
Total deferred charges and other assets	948,391		952,328		978,344
Total assets	7,091,671		6,682,491		6,901,570
Current liabilities:
Short-term borrowings	31,600		28,200		0
Long-term debt due within one year	69,091		134,108		282,199
Accounts payable	411,621		388,015		379,840
Taxes payable	89,896		46,475		46,919
Dividends payable	32,745		171		31,800
Accrued compensation	44,159		48,448		37,774
Commodity derivative instruments	1,388		0		1,037
Other accrued liabilities	185,389		204,698		244,922
Total current liabilities	865,889		850,115		1,024,491
Long-term debt	1,937,663		1,610,867		1,383,432
Deferred credits and other liabilities:
Deferred income taxes	782,838		755,102		839,683
Other liabilities	810,639		818,159		833,692
Total deferred credits and other liabilities	1,593,477		1,573,261		1,673,375
Equity:
Preferred stocks	15,000		15,000		15,000
Common stockholders' equity:
Shares issued - 189,369,450 at June 30, 2013 and 2012 and December 31, 2012	189,369		189,369		189,369
Other paid-in capital	1,040,379		1,039,080		1,036,935
Retained earnings	1,494,419		1,457,146		1,612,169
Accumulated other comprehensive loss	(56,821)		(48,721)		(29,575)
Treasury stock at cost - 538,921 shares	(3,626)		(3,626)		(3,626)
Total common stockholders' equity	2,663,720		2,633,248		2,805,272
Total stockholders' equity	2,678,720		2,648,248		2,820,272
Noncontrolling interest	15,922		0		0
Total equity	2,694,642		2,648,248		2,820,272
Total liabilities and equity	$ 7,091,671		$ 6,682,491		$ 6,901,570

[1] Balance is presented net of accumulated impairment of $12.3 million at the pipeline and energy services segment, which occurred in prior periods.