Changes In Accumulated Other Comprehensive Loss (Changes In Accumulated Other Comprehensive Loss By Component) (Details) (USD $)	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (13,751,000)		$ (24,048,000)		$ (13,910,000)		$ (24,946,000)
Other comprehensive income (loss) before reclassification	368,000		826,000		810,000		1,041,000
Amount reclassified from accumulated other comprehensive income (loss)	(394,000)		652,000		(677,000)		1,335,000
Net current-period other comprehensive income (loss)	(26,000)		1,478,000		133,000		2,376,000
Ending balance	(13,777,000)		(22,570,000)		(13,777,000)		(22,570,000)
Gains And Losses On Derivatives Fair Value [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(4,270,000)	[1]	(6,805,000)	[2]	(4,279,000)	[1]	(7,352,000)	[2]
Other comprehensive income (loss) before reclassification	326,000	[1]	620,000	[2]	793,000	[1]	795,000	[2]
Amount reclassified from accumulated other comprehensive income (loss)	(370,000)	[1]	342,000	[2]	(828,000)	[1]	714,000	[2]
Net current-period other comprehensive income (loss)	(44,000)	[1]	962,000	[2]	(35,000)	[1]	1,509,000	[2]
Ending balance	(4,314,000)	[1]	(5,843,000)	[2]	(4,314,000)	[1]	(5,843,000)	[2]
Unrealized Translation (Loss) Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(439,000)		(310,000)		(414,000)		(350,000)
Other comprehensive income (loss) before reclassification	42,000		206,000		17,000		246,000
Net current-period other comprehensive income (loss)	42,000		206,000		17,000		246,000
Ending balance	(397,000)		(104,000)		(397,000)		(104,000)
Defined Benefit Pension Items [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(9,042,000)		(16,933,000)		(9,217,000)		(17,244,000)
Amount reclassified from accumulated other comprehensive income (loss)	(24,000)		310,000		151,000		621,000
Net current-period other comprehensive income (loss)	(24,000)		310,000		151,000		621,000
Ending balance	(9,066,000)		(16,623,000)		(9,066,000)		(16,623,000)
Oslo Bulk, AS [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Interest rate swap fair value	$ (555,000)		$ (722,503)		$ (555,000)		$ (722,503)
Ownership percentage (in hundredths)	25.00%		25.00%		25.00%		25.00%

[1] The fair value balance as of June 30, 2014, includes a negative $555,000 balance related to an interest rate swap from our 25% investment in Oslo Bulk AS.

[2] The fair value balance as of June 30, 2013, includes a negative $722,503 balance related to an interest rate swap from our 25% investment in Oslo Bulk AS.