CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Current assets:
Cash and short-term investments	$ 524,922	$ 398,575
Short-term investments	253,282	140,914
Assets held for sale	383,857	401,500
Accounts receivable, net	1,382,623	1,576,555
Inventory	251,133	272,852
Deferred income taxes	110,480	127,874
Other current assets	226,560	170,044
Total current assets	3,132,857	3,088,314
Long-term investments	4,269	11,124
Property, plant and equipment, net	8,712,088	8,629,946
Goodwill	472,326	501,258
Investment in unconsolidated affiliates	61,690	371,021
Other long-term assets	272,792	310,477
Total assets	12,656,022	12,912,140
Current liabilities:
Current portion of long-term debt	364	275,326
Trade accounts payable	499,010	782,753
Accrued liabilities	599,380	716,773
Income taxes payable	33,628	27,710
Total current liabilities	1,132,382	1,802,562
Long-term debt	4,379,336	4,348,490
Other long-term liabilities	518,664	292,758
Deferred income taxes	599,335	797,925
Total liabilities	6,629,717	7,241,735
Commitments and contingencies (Note 18)
Subsidiary preferred stock (Notes 5 and 15)	69,188	69,188
Shareholders' equity:
Common shares, par value $0.001 per share: Authorized common shares 800,000; issued 318,813 and 317,042, respectively	319	317
Capital in excess of par value	2,337,244	2,287,743
Accumulated other comprehensive income	431,595	321,264
Retained earnings	4,120,398	3,956,364
Less: treasury shares, at cost, 28,414 and 29,414 common shares, respectively	(944,627)	(977,873)
Total shareholders' equity	5,944,929	5,587,815
Noncontrolling interest	12,188	13,402
Total equity	5,957,117	5,601,217
Total liabilities and equity	$ 12,656,022	$ 12,912,140