Consolidated Balance Sheets - USD ($) $ in Thousands		Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015
Current assets:
Cash and cash equivalents		$ 85,117	$ 83,903	$ 143,527
Receivables, net		637,166	582,475	597,606
Inventories		265,849	240,551	290,239
Deferred income taxes		33,938	33,121	38,087
Prepayments and other current assets		50,309	29,528	66,676
Current assets held for sale		85,124	54,847	147,162
Total current assets		1,157,503	1,024,425	1,283,297
Investments		124,531	119,704	119,446
Property, plant and equipment		6,526,563	6,387,702	6,131,044
Less accumulated depreciation, depletion and amortization		2,551,941	2,489,322	2,438,005
Net property, plant and equipment		3,974,622	3,898,380	3,693,039
Deferred charges and other assets:
Goodwill	[1]	641,527	635,204	635,204
Other intangible assets, net		7,160	7,342	8,506
Other		360,520	351,603	352,728
Noncurrent assets held for sale		123,721	565,509	1,160,657
Total deferred charges and other assets		1,132,928	1,559,658	2,157,095
Total assets		6,389,584	6,602,167	7,252,877
Current liabilities:
Long-term debt due within one year		58,598	238,539	415,539
Accounts payable		275,791	286,061	234,894
Taxes payable		45,749	46,880	37,365
Dividends payable		36,791	36,784	35,734
Accrued compensation		56,390	45,192	47,771
Other accrued liabilities		196,701	167,322	164,427
Current liabilities held for sale		32,357	130,375	145,211
Total current liabilities		702,377	951,153	1,080,941
Long-term debt		1,928,709	1,557,624	1,886,804
Deferred credits and other liabilities:
Deferred income taxes		700,539	696,750	739,342
Other liabilities		820,349	812,342	757,108
Noncurrent liabilities held for sale		0	63,750	101,790
Total deferred credits and other liabilities		1,520,888	1,572,842	1,598,240
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 June 30, 2016, 195,411,301 at June 30, 2015 and 195,804,665 at December 31, 2015		195,843	195,805	195,411
Other paid-in-capital		1,230,342	1,230,119	1,220,615
Retained earnings		838,257	996,355	1,155,777
Accumulated other comprehensive loss		(38,206)	(37,148)	(40,246)
Treasury stock at cost - 538,921 shares		(3,626)	(3,626)	(3,626)
Total common stockholders' equity		2,222,610	2,381,505	2,527,931
Total stockholders' equity		2,237,610	2,396,505	2,542,931
Noncontrolling interest		0	124,043	143,961
Total equity		2,237,610	2,520,548	2,686,892
Total liabilities and equity		$ 6,389,584	$ 6,602,167	$ 7,252,877

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