Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Net Cash Provided by Operating Activities of Continuing Operations	$ 84,135	$ 130,791
Cash Flows from Investing Activities of Continuing Operations:
Purchases of property and equipment	(186,541)	(127,407)
Proceeds from disposition of property and equipment	11,920	25,080
Cash settlements on derivative transactions, net	(202)	4,052
Investments in and advances to 50% or less owned companies	(32,731)	(26,503)
Return of investments and advances from 50% or less owned companies	26,421	5,100
Net advances on revolving credit line to 50% or less owned companies	(300)	(8,916)
Principal payments on third party notes receivable, net	19,536	(20,323)
Net increase in restricted cash	2,934	(325)
Net (increase) decrease in construction reserve funds and title XI reserve funds	67,554	9,206
Net increase in escrow deposits on like-kind exchanges	0	(3,396)
Repayments on leases, net	1,793	2,777
Businesses acquisitions, net of cash acquired	(148,084)	(28,696)
Net cash used in investing activities of continuing operations	(237,700)	(169,351)
Cash Flows from Financing Activities of Continuing Operations:
Payments on long term debt and capital lease obligations	96,106	7,509
Net borrowings (repayments) on inventory financing arrangements	14,798	(5,793)
Proceeds from issuance of long term debt, net of offering costs	38,134	0
Common stock acquired for treasury	(17,431)	0
Proceeds and tax benefits from share award plans	6,659	6,251
Purchase of subsidiary shares from noncontrolling interests	0	1,149
Cash received from (dividends paid to) noncontrolling interests, net	(1,715)	(403)
Net cash provided by (used in) financing activities of continuing operations	(85,257)	2,983
Effect of Exchange Rate Changes on Cash and Cash Equivalents	1,478	5,635
Net Increase (Decrease) in Cash and Cash Equivalents from Continuing Operations	(237,344)	(29,942)
Cash Flows from Discontinued Operations:
Operating Activities	(11,749)	31,399
Investing Activities	87,904	(3,982)
Financing activities	0	0
Effects of Exchange Rate Changes on Cash and Cash Equivalents	27	21
Net Increase in Cash and Cash Equivalents from Discontinued Operations	76,182	27,438
Net Increase (Decrease) in Cash and Cash Equivalents	(161,162)	(2,504)
Cash and Cash Equivalents, Beginning of Period	462,188	365,329
Cash and Cash Equivalents, End of Period	$ 301,026	$ 362,825