Long-Term Debt (Narrative) (Details) (USD $)	1 Months Ended	3 Months Ended			0 Months Ended	3 Months Ended	1 Months Ended	3 Months Ended					0 Months Ended	9 Months Ended	0 Months Ended	9 Months Ended	12 Months Ended
	Aug. 31, 2014	Sep. 30, 2014	Sep. 24, 2013	Sep. 30, 2014 Loan Agreement [Member]	Aug. 26, 2014 Loan Agreement [Member] DVB Bank SE [Member] item	Sep. 30, 2014 Loan Agreement [Member] DVB Bank SE [Member] item	Aug. 31, 2014 Loan Agreement [Member] RBS Asset Finance [Member] item	Sep. 30, 2014 Loan Agreement [Member] RBS Asset Finance [Member] item	Sep. 30, 2013 Senior Secured Credit Facility [Member]	Sep. 24, 2013 Senior Secured Credit Facility [Member] item	Sep. 24, 2013 Standby Letters Of Credit [Member]	Sep. 24, 2013 Swingline Loans [Member]	Sep. 24, 2013 Line Of Credit Facility [Member]	Sep. 30, 2014 Line Of Credit Facility [Member]	Sep. 24, 2013 Variable Rate Financing Agreement [Member]	Sep. 30, 2014 Variable Rate Financing Agreement [Member]	Dec. 31, 2013 Variable Rate Financing Agreement [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity					$ 38,500,000	$ 38,500,000	$ 23,000,000	$ 23,000,000		$ 45,000,000
Fixed rate (in hundredths)						4.35%
Number of quarterly payments					24	24
Final quarterly balloon payment					20,700,000	20,700,000
Deferred loan costs						519,000		230,000
Old unamortized loan costs								225,000
One third pre-month funding of upcoming quarterly debt payment, amount				387,000
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
Number of lenders										4
Lender commitments, minimum										15,000,000
Lender commitments, maximum										30,000,000
Amount of additional term loan										50,000,000
Variable rate financing agreement term																5 years	5 years
Total amount paid off													46,600,000
Amount drawn from line of credit															21,000,000
Bank fees									1,400,000
Third party fees									148,000
Line of credit			50,000,000							50,000,000	20,000,000	5,000,000
Consolidated Leverage Ratio through June 30, 2014														4.50%
Future Consolidated Leverage Ratio after June 30, 2014														4.25%
Minimum Liquidity Amount through June 30, 2014														15,000,000
Minimum Future Liquidity Amount after June 30, 2014														$ 20,000,000
Future Consolidated Leverage Ratio through the fiscal quarter ending December 31, 2015														5.00%
Future Consolidated Leverage Ratio fiscal quarter ending March 31, 2016														4.75%
Future Consolidated Leverage Ratio beginning the quarter ending June 30, 2016 through the quarter ending September 30, 2016														4.50%
Future Consolidated Leverage Ratio after September 30, 2016														4.25%
Future Minimum Fixed Charge Coverage Ratio beginning with the quarter ending September 30, 2014 through the quarter ending December 31, 2014														1.10%
Future Minimum Fixed Charge Coverage Ratio beginning with the quarter ending March 31, 2015 through the quarter ending December 31, 2015														1.15%
Future Minimum Fixed Charge Coverage Ratio beginning with the quarter ending March 31, 2016 through the quarter ending June 30, 2016														0.05%
Future Minimum Fixed Charge Coverage Ratio after June 30, 2016														1.25%