Long-Term Debt (Schedule Of Long-Term Debt) (Details) (USD $)	1 Months Ended	3 Months Ended			0 Months Ended		1 Months Ended			9 Months Ended				9 Months Ended				9 Months Ended						9 Months Ended		9 Months Ended				9 Months Ended				9 Months Ended				9 Months Ended				9 Months Ended							9 Months Ended		0 Months Ended	3 Months Ended	1 Months Ended	3 Months Ended
	Aug. 31, 2014	Sep. 30, 2014	Dec. 31, 2013	Sep. 24, 2013	Jun. 20, 2011 Notes Payable - Variable Rate 2018a [Member]	Jun. 20, 2011 Notes Payable - Variable Rate 2018b [Member]	Jan. 24, 2012 Notes Payable - Variable Rate 2018b [Member]	Nov. 30, 2011 Notes Payable - Variable Rate 2018b [Member]	Sep. 30, 2014 Notes Payable - Variable Rate 2020 [Member]	Sep. 30, 2014 Notes Payable - Fixed Rate 2020 [Member]		Sep. 30, 2014 Note Payable - Mortgage [Member]		Sep. 30, 2014 Senior Secured Credit Facility [Member] Notes Payable - Variable Rate 2018a [Member]		Dec. 31, 2013 Senior Secured Credit Facility [Member] Notes Payable - Variable Rate 2018a [Member]		Sep. 30, 2014 Senior Secured Credit Facility [Member] Notes Payable - Variable Rate 2018b [Member]		Dec. 31, 2013 Senior Secured Credit Facility [Member] Notes Payable - Variable Rate 2018b [Member]		Sep. 30, 2014 Senior Secured Credit Facility [Member] Notes Payable - Variable Rate 2018b [Member] Minimum [Member]	Sep. 30, 2014 Senior Secured Credit Facility [Member] Notes Payable - Variable Rate 2018b [Member] Maximum [Member]	Sep. 30, 2014 Senior Secured Credit Facility [Member] Notes Payable - Variable Rate 2017 [Member]	Dec. 31, 2013 Senior Secured Credit Facility [Member] Notes Payable - Variable Rate 2017 [Member]	Sep. 30, 2014 Senior Secured Credit Facility [Member] Notes Payable - Variable Rate 2021 [Member]		Dec. 31, 2013 Senior Secured Credit Facility [Member] Notes Payable - Variable Rate 2021 [Member]		Sep. 30, 2014 Senior Secured Credit Facility [Member] Notes Payable - Variable Rate 2018c [Member]		Dec. 31, 2013 Senior Secured Credit Facility [Member] Notes Payable - Variable Rate 2018c [Member]		Sep. 30, 2014 Senior Secured Credit Facility [Member] Notes Payable - Variable Rate 2020 [Member]		Dec. 31, 2013 Senior Secured Credit Facility [Member] Notes Payable - Variable Rate 2020 [Member]		Sep. 30, 2014 Senior Secured Credit Facility [Member] Notes Payable - Variable Rate 2018d [Member]		Dec. 31, 2013 Senior Secured Credit Facility [Member] Notes Payable - Variable Rate 2018d [Member]		Sep. 30, 2014 Secured Line Of Credit [Member]		Dec. 31, 2013 Secured Line Of Credit [Member]		Sep. 24, 2013 Senior Secured Credit Facility [Member]	Sep. 24, 2013 Standby Letters Of Credit [Member]	Sep. 24, 2013 Swingline Loans [Member]	Sep. 30, 2014 ING Bank [Member]	Jun. 20, 2011 ING Bank [Member] item	Aug. 26, 2014 DVB Bank SE [Member] Loan Agreement [Member] item	Sep. 30, 2014 DVB Bank SE [Member] Loan Agreement [Member] item	Aug. 31, 2014 RBS Asset Finance [Member] Loan Agreement [Member] item	Sep. 30, 2014 RBS Asset Finance [Member] Loan Agreement [Member] item
Debt Instrument [Line Items]
Interest rate (in hundredths)										4.35%	[1]			2.7331%	[2]	2.7451%	[2]			2.74%	[2]	2.7346%	2.7381%	2.504%	2.5188%	2.9015%	[3]	2.9181%	[3]	2.7326%	[2]	2.7384%	[2]	3.6179%	[4]	2.8964%	[4]	3.99%	[5]	3.75%	[5]	3.91%	[5]	3.67%	[5]							4.35%
Maturity date										2020	[1]			2018	[2]			2018	[2]					2017		2021	[3]			2018	[2]			2020	[4]			2018	[5]			2018	[5]
Total Principal Due		$ 253,503,000	$ 198,229,000							$ 38,500,000	[1]	$ 5,000	[6]	$ 12,884,000	[2]	$ 15,460,000	[2]	$ 42,320,000	[2]	$ 45,081,000	[2]			$ 9,704,000	$ 11,383,000	$ 22,766,000	[3]	$ 12,780,000	[3]	$ 15,708,000	[2]	$ 16,651,000	[2]	$ 27,866,000	[4]	$ 31,437,000	[4]	$ 42,750,000	[5]	$ 44,437,000	[5]	$ 41,000,000	[5]	$ 21,000,000	[5]
Less current maturities		(23,347,000)	(19,213,000)
Long-term debt - non-current		230,156,000	179,016,000
Interest rate swap , fixed interest rate (in hundredths)									2.065%
Effective, swaption interest rate (in hundredths)									5.565%
Term of financing agreement in years																																																	7 years
Business acquisition interest in acquiree					100.00%
Proceeds from borrowings of line of credit					24,100,000	23,300,000	12,700,000	6,100,000
Number of tranches																																																		2
Term loan facility principal amount																																														45,000,000
Line of credit				50,000,000																																										50,000,000	20,000,000	5,000,000
Maximum borrowing capacity																																														45,000,000					38,500,000	38,500,000	23,000,000	23,000,000
Number of quarterly payments																																																			24	24
Final quarterly balloon payment																																																			20,700,000	20,700,000
Bank debt owed to DnB ASA paid off	$ 11,400,000	$ 11,400,000
Basis spread on variable interest rate																																																					2.75%	2.75%
Number of monthly payments																																																					84	84

[1] We entered into a fixed rate financing agreement with DVB Bank SE, on August 26, 2014 in the amount of $38.5 million, collateralized by our 2007 PCTC at a rate of 4.35% with 24 quarterly payments with a final balloon payment of $20.7 million in August 2020.

[2] We entered into a variable rate financing agreement with ING Bank N.V., London branch on June 20, 2011 for a seven year facility to finance the acquisition of a Capesize vessel and a Supramax Bulk Carrier newbuilding, both of which we acquired a 100% interest in as a result of our acquisition of Dry Bulk. Pursuant to the terms of the facility, the lender agreed to provide a secured term loan facility divided into two tranches: Tranche A, fully drawn on June 20, 2011 in the amount of $24.1 million, and Tranche B, providing up to $23.3 million of additional credit. Under Tranche B, we drew $6.1 million in November 2011 and $12.7 million in January 2012.

[3] During August 2014, we paid off our $11.4 million loan with DnB ASA and obtained a new loan with RBS Asset Finance in the amount of $23.0 million collateralized by one of our 1999 PCTCs at a variable rate of 30 day Libor rate plus 2.75% payable in 84 monthly installments with the final payment due August 2021.

[4] We have an interest rate swap agreement in place to fix the interest rate on our variable rate note payable expiring in 2020 at 2.065%. After applicable margin adjustments, the effective interest rate on this note payable is fixed at 5.565%. The swap agreement is for the same term as the associated note payable.

[5] As described in greater detail above, our senior secured Credit Facility matures on September 24, 2018 and includes a term loan facility in the principal amount of $45 million and a LOC in the principal amount up to $50 million. The LOC facility includes a $20 million sublimit for the issuance of standby letters of credit and a $5 million sublimit for swingline loans.

[6] Represents consideration given in connection with the proposed construction financing relating to the building we plan to renovate as our new New Orleans headquarters building.