Fair Value Measurements (Financial Assets And Liabilities Measured At Fair Value On Recurring Basis) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Dividend income (expense), net on marketable securities	$ (200,000)	$ (500,000)	$ (800,000)
Interest income, net on marketable securities		200,000	2,800,000
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	24,292,000		21,688,000
Derivative instruments (included in other receivables)	185,000		2,840,000
Construction reserve funds and Title XI reserve funds			195,629,000
Short sales of marketable securities	10,697,000		8,277,000
Derivative instruments (included in other current liabilities)	1,511,000		840,000
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0		0
Derivative instruments (included in other receivables)	6,072,000		4,696,000
Construction reserve funds and Title XI reserve funds	0		0
Short sales of marketable securities	0		0
Derivative instruments (included in other current liabilities)	1,828,000		6,140,000
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0		0
Derivative instruments (included in other receivables)	0		0
Construction reserve funds and Title XI reserve funds	0		0
Short sales of marketable securities	0		0
Derivative instruments (included in other current liabilities)	0		0
Marketable Security Positions Held By The Company As Of December 31, 2013 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable security gains (losses), net include losses	5,800,000	(700,000)	(7,500,000)
Marketable Security Positions Held By The Company As Of December 31, 2012 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable security gains (losses), net include losses		$ (900,000)	$ (7,700,000)