Consolidated Balance Sheets - USD ($) $ in Thousands		Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015
Current assets:
Cash and cash equivalents		$ 90,938	$ 84,591	$ 126,440
Receivables, net		537,744	590,105	505,964
Inventories		276,812	253,727	328,072
Deferred income taxes		33,868	32,849	37,385
Prepayments and other current assets		57,821	35,059	80,905
Current assets held for sale		57,753	24,581	91,205
Total current assets		1,054,936	1,020,912	1,169,971
Investments		121,955	119,704	118,370
Property, plant and equipment		6,878,595	6,817,668	6,367,988
Less accumulated depreciation, depletion and amortization		2,543,942	2,506,571	2,412,060
Net property, plant and equipment		4,334,653	4,311,097	3,955,928
Deferred charges and other assets:
Goodwill	[1]	641,527	635,204	635,204
Other intangible assets, net		7,803	7,342	9,166
Other		359,977	360,546	319,627
Noncurrent assets held for sale		97,549	166,734	1,113,529
Total deferred charges and other assets		1,106,856	1,169,826	2,077,526
Total assets		6,618,400	6,621,539	7,321,795
Current liabilities:
Short-term borrowings		61,525	45,500	16,100
Long-term debt due within one year		104,915	243,789	408,539
Accounts payable		260,432	310,466	209,456
Taxes payable		50,222	45,775	44,282
Dividends payable		36,791	36,784	35,687
Accrued compensation		41,137	46,130	34,905
Other accrued liabilities		189,275	171,592	164,151
Current liabilities held for sale		17,170	47,603	82,313
Total current liabilities		761,467	947,639	995,433
Long-term debt		1,822,139	1,621,374	1,775,105
Deferred credits and other liabilities:
Deferred income taxes		728,304	720,319	736,731
Other liabilities		811,106	811,659	757,233
Noncurrent liabilities held for sale		0	0	122,850
Total deferred credits and other liabilities		1,539,410	1,531,978	1,616,814
Equity:
Preferred stocks		15,000	15,000	15,000
Common stockholders' equity:
Authorized - 500,000,000 shares, $1.00 par value Shares issued - 195,843,297 at March 31, 2016, 195,191,129 at March 31, 2015 and 195,804,665 at December 31, 2015		195,843	195,805	195,191
Other paid-in-capital		1,229,431	1,230,119	1,214,867
Retained earnings		984,315	996,355	1,421,220
Accumulated other comprehensive loss		(38,582)	(37,148)	(40,924)
Treasury stock at cost - 538,921 shares		(3,626)	(3,626)	(3,626)
Total common stockholders' equity		2,367,381	2,381,505	2,786,728
Total stockholders' equity		2,382,381	2,396,505	2,801,728
Noncontrolling interest		113,003	124,043	132,715
Total equity		2,495,384	2,520,548	2,934,443
Total liabilities and equity		$ 6,618,400	$ 6,621,539	$ 7,321,795

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