Long Term Debt (Schedule Of Long-Term Debt) (Details) (USD $)	1 Months Ended	3 Months Ended			0 Months Ended	1 Months Ended		12 Months Ended		0 Months Ended
	Aug. 31, 2014	Mar. 31, 2015		Mar. 31, 2014	Jun. 20, 2011	Jan. 24, 2012	Nov. 30, 2011	Dec. 31, 2014		Aug. 26, 2014 item	Sep. 24, 2013
Debt Instrument [Line Items]
Total Principal Due		$ 226,043,000						$ 242,888,000
Less current maturities		(22,412,000)						(23,367,000)
Long-term debt - non-current		203,631,000						219,521,000
Proceeds from borrowings of line of credit		5,000,000		8,000,000
Line of credit											50,000,000
Bank debt owed to DnB ASA paid off	11,400,000
Notes Payable - Variable Rate 2018a [Member]
Debt Instrument [Line Items]
Interest rate (in hundredths)		2.7703%	[1]					2.7471%	[1]
Maturity date		2018	[1]
Total Principal Due		11,166,000	[1]					12,025,000	[1]
Business acquisition interest in acquiree					100.00%
Proceeds from borrowings of line of credit					24,100,000
Notes Payable - Variable Rate 2018b [Member]
Debt Instrument [Line Items]
Interest rate, minimum (in hundredths)		2.675%						2.7312%
Interest rate, maximum (in hundredths)		2.714%						2.7324%
Maturity date		2018
Total Principal Due		26,986,000						41,400,000
Proceeds from borrowings of line of credit					23,300,000	12,700,000	6,100,000
Notes Payable - Variable Rate 2017 [Member]
Debt Instrument [Line Items]
Interest rate (in hundredths)		2.5219%						2.505%
Maturity date		2017
Total Principal Due		8,584,000						9,144,000
Notes Payable - Variable Rate 2018c [Member]
Debt Instrument [Line Items]
Interest rate (in hundredths)		2.7561%	[1]					2.735%	[1]
Maturity date		2018	[1]
Total Principal Due		15,080,000	[1]					15,394,000	[1]
Notes Payable - Variable Rate 2020 [Member]
Debt Instrument [Line Items]
Interest rate (in hundredths)		3.61%	[2]					3.61%	[2]
Maturity date		2020	[2]
Total Principal Due		24,020,000	[2]					24,812,000	[2]
Interest rate swap , fixed interest rate (in hundredths)		2.065%
Effective, swaption interest rate (in hundredths)		5.565%
Notes Payable - Variable Rate 2018d [Member]
Debt Instrument [Line Items]
Interest rate (in hundredths)		4.01%	[3]					3.99%	[3]
Maturity date		2018	[3]
Total Principal Due		41,063,000	[3]					41,906,000	[3]
Notes Payable - Fixed Rate 2020 [Member]
Debt Instrument [Line Items]
Interest rate (in hundredths)		4.35%	[4]					4.35%	[4]
Maturity date		2020	[4]
Total Principal Due		37,019,000	[4]					37,759,000	[4]
Notes Payable - Variable Rate 2021 [Member]
Debt Instrument [Line Items]
Interest rate (in hundredths)		2.922%	[5]					2.9195%	[5]
Maturity date		2021	[5]
Total Principal Due		21,120,000	[5]					21,943,000	[5]
Note Payable - Mortgage [Member]
Debt Instrument [Line Items]
Total Principal Due		5,000	[6]					5,000	[6]
Line Of Credit Facility [Member]
Debt Instrument [Line Items]
Interest rate (in hundredths)		3.97%	[3]					3.91%	[3]
Maturity date		2018	[3]
Total Principal Due		41,000,000	[3]					38,500,000	[3]
Senior Secured Credit Facility [Member]
Debt Instrument [Line Items]
Total Principal Due		41,000,000
Term loan facility principal amount		45,000,000									45,000,000
Line of credit		50,000,000
Standby Letters Of Credit [Member]
Debt Instrument [Line Items]
Line of credit		20,000,000									20,000,000
Swingline Loans [Member]
Debt Instrument [Line Items]
Line of credit		5,000,000									5,000,000
Loan Agreement [Member]
Debt Instrument [Line Items]
One third pre-month funding of upcoming quarterly debt payment, amount		400,000
ING Bank [Member]
Debt Instrument [Line Items]
Term of financing agreement in years		7 years
Number of tranches					2
DVB Bank SE [Member] | Loan Agreement [Member]
Debt Instrument [Line Items]
Term loan facility principal amount										38,500,000
Number of quarterly payments										24
Final quarterly balloon payment										20,700,000
RBS Asset Finance [Member] | Loan Agreement [Member]
Debt Instrument [Line Items]
Term loan facility principal amount	$ 23,000,000
Basis spread on variable interest rate	2.75%
Number of monthly payments	84

[1] We entered into a variable rate financing agreement with ING Bank N.V., London branch in June 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 in June 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.

[2] 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.

[3] 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.

[4] 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. This loan requires us to pre-fund a one-third portion of the upcoming quarterly scheduled debt payment, which, at March 31, 2015, constituted $0.4 million and is included as restricted cash on the balance sheet.

[5] 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.

[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.