CONDENSED CONSOLIDATED BALANCE SHEET (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
CONDENSED CONSOLIDATED BALANCE SHEET
Property, plant and equipment, accumulated depreciation	$ 1,075,284	$ 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)	163,032,682	162,359,906
Common stock, outstanding shares (in shares)	163,032,682	162,359,906
CURRENT ASSETS, VIEs
Cash and cash equivalents	2,105,076	2,154,541
Marketable securities, current	192,188	137,127
Accounts and notes receivable	1,355,841	1,242,691
Contract work in progress	1,974,529	1,942,679
Property, plant and equipment, net	929,275	951,255
CURRENT LIABILITIES, VIEs
Trade accounts payable	1,900,848	1,954,108
Advance billings on contracts related	742,422	870,147
Accrued salaries, wages and benefits	747,675	755,075
Other accrued liabilities	283,129	286,992
Consolidated variable interest entities
CURRENT ASSETS, VIEs
Cash and cash equivalents	486,805	411,550
Marketable securities, current	50,430	30,369
Accounts and notes receivable	212,144	193,354
Contract work in progress	223,939	221,897
Property, plant and equipment, net	101,949	105,692
CURRENT LIABILITIES, VIEs
Trade accounts payable	294,147	295,972
Advance billings on contracts related	266,492	300,491
Accrued salaries, wages and benefits	95,688	59,183
Other accrued liabilities	$ 25,707	$ 6,478