Changes In Accumulated Other Comprehensive Loss (Changes In Accumulated Other Comprehensive Loss By Component) (Details) (USD $)	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (13,777,000)		$ (22,571,000)		$ (13,910,000)		$ (24,946,000)
Other comprehensive income (loss) before reclassification	766,000		2,968,000		1,576,000		4,009,000
Amount reclassified from accumulated other comprehensive income (loss)	(319,000)		(2,189,000)		(996,000)		(855,000)
Net current-period other comprehensive income (loss)	447,000		779,000		580,000		3,154,000
Ending balance	(13,330,000)		(21,792,000)		(13,330,000)		(21,792,000)
Gains And Losses On Derivatives Fair Value [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(4,314,000)	[1]	(5,844,000)	[2]	(4,279,000)	[1]	(7,352,000)	[2]
Other comprehensive income (loss) before reclassification	850,000	[1]	3,275,000	[2]	1,643,000	[1]	4,070,000	[2]
Amount reclassified from accumulated other comprehensive income (loss)	(393,000)	[1]	(2,495,000)	[2]	(1,221,000)	[1]	(1,782,000)	[2]
Net current-period other comprehensive income (loss)	457,000	[1]	780,000	[2]	422,000	[1]	2,288,000	[2]
Ending balance	(3,857,000)	[1]	(5,064,000)	[2]	(3,857,000)	[1]	(5,064,000)	[2]
Unrealized Translation (Loss) Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(397,000)		(104,000)		(414,000)		(350,000)
Other comprehensive income (loss) before reclassification	(84,000)		(307,000)		(67,000)		(61,000)
Net current-period other comprehensive income (loss)	(84,000)		(307,000)		(67,000)		(61,000)
Ending balance	(481,000)		(411,000)		(481,000)		(411,000)
Defined Benefit Pension Items [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(9,066,000)		(16,623,000)		(9,217,000)		(17,244,000)
Amount reclassified from accumulated other comprehensive income (loss)	74,000		306,000		225,000		927,000
Net current-period other comprehensive income (loss)	74,000		306,000		225,000		927,000
Ending balance	(8,992,000)		(16,317,000)		(8,992,000)		(16,317,000)
Oslo Bulk, AS [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Interest rate swap fair value	$ (461,000)		$ (717,000)		$ (461,000)		$ (717,000)
Ownership percentage (in hundredths)	25.00%		25.00%		25.00%		25.00%

[1] The fair value balance as of September 30, 2014, includes a negative $461,000 balance related to an interest rate swap from our 25% investment in Oslo Bulk AS.

[2] The fair value balance as of September 30, 2013, includes a negative $717,000 balance related to an interest rate swap from our 25% investment in Oslo Bulk AS.