Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Net Cash Provided by Operating Activities of Continuing Operations	$ 78,235	$ 65,293
Cash Flows from Investing Activities of Continuing Operations:
Purchases of property and equipment	(87,931)	(99,507)
Proceeds from disposition of property and equipment	125,432	7,394
Investments in and advances to 50% or less owned companies	(26,822)	(31,906)
Return of investments and advances from 50% or less owned companies	8,315	25,641
Net advances on revolving credit line to 50% or less owned companies	0	(300)
Principal payments on third party notes receivable, net	4,509	18,970
Net increase in restricted cash	11,509	2,934
Net (increase) decrease in construction reserve funds and title XI reserve funds	45,254	67,554
Repayments on leases, net	1,731	1,793
Businesses acquisitions, net of cash acquired	(10,540)	(148,084)
Net cash used in investing activities of continuing operations	71,457	(155,511)
Cash Flows from Financing Activities of Continuing Operations:
Repayments of Debt and Capital Lease Obligations	10,027	64,712
Net borrowings (repayments) on inventory financing arrangements	(2,365)	14,798
Proceeds from issuance of long term debt, net of offering costs	6	134
Common stock acquired for treasury	0	17,431
Cash Received (Paid) For Share Settlements from Spinoff Transactions	(357)	0
Proceeds and tax benefits from share award plans	8,779	6,659
Cash received from (dividends paid to) noncontrolling interests, net	(3,236)	(1,715)
Net cash provided by (used in) financing activities of continuing operations	(2,470)	(91,863)
Effect of Exchange Rate Changes on Cash and Cash Equivalents	(2,565)	910
Net Increase (Decrease) in Cash and Cash Equivalents from Continuing Operations	144,657	(181,171)
Cash Flows from Discontinued Operations:
Operating Activities	24,298	76,624
Investing Activities	(8,502)	5,715
Financing Activities	(14,017)	6,606
Effects of Exchange Rate Changes on Cash and Cash Equivalents	143	595
Net Increase in Cash and Cash Equivalents from Discontinued Operations	1,922	89,540
Net Increase (Decrease) in Cash and Cash Equivalents	146,579	(91,631)
Cash and Cash Equivalents, Beginning of Period	248,204	381,482
Cash and Cash Equivalents, End of Period	$ 394,783	$ 289,851