Supplemental Information For Statements Of Cash Flows (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Supplemental Cash Flow Information [Abstract]
Income taxes paid	$ 4,285	$ 24,378	$ 8,398
Income taxes refunded	2,739	11,317	2,499
Interest paid, excluding capitalized interest	32,388	46,457	39,559
Company financed purchase of noncontrolling interests	0	48,064	0
Company financed sale of vessels	10,263	48,848	11,889
Contribution of assets to business ventures	0	15,123	12,361
Stock Issued During Period, Value, Acquisitions	0	585	0
Contribution of assets from noncontrolling interest	$ 0	$ 0	$ 124