CONDENSED CONSOLIDATED BALANCE SHEET (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
CONDENSED CONSOLIDATED BALANCE SHEET
Property, plant and equipment, accumulated depreciation	$ 1,113,421	$ 1,032,509
Shareholders' equity
Preferred stock, authorized shares (in shares)	20,000,000	20,000,000
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, issued shares (in shares)	0	0
Common stock, authorized shares (in shares)	375,000,000	375,000,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, issued shares (in shares)	163,261,653	162,359,906
Common stock, outstanding shares (in shares)	163,261,653	162,359,906
CURRENT ASSETS, VIEs
Cash and cash equivalents	2,537,570	2,154,541
Marketable securities, current	157,910	137,127
Accounts and notes receivable	1,156,387	1,242,691
Contract work in progress	2,102,713	1,942,679
Property, plant and equipment, net	937,066	951,255
CURRENT LIABILITIES, VIEs
Trade accounts payable	1,974,777	1,954,108
Advance billings on contracts related	796,601	870,147
Accrued salaries, wages and benefits	713,971	755,075
Other accrued liabilities	301,399	286,992
Consolidated variable interest entities
CURRENT ASSETS, VIEs
Cash and cash equivalents	597,484	411,550
Marketable securities, current	12,068	30,369
Accounts and notes receivable	208,819	193,354
Contract work in progress	280,350	221,897
Property, plant and equipment, net	96,699	105,692
CURRENT LIABILITIES, VIEs
Trade accounts payable	342,972	295,972
Advance billings on contracts related	318,442	300,491
Accrued salaries, wages and benefits	75,870	59,183
Other accrued liabilities	$ 26,189	$ 6,478