Long-Term Debt (Narrative) (Details) (USD $)	0 Months Ended	1 Months Ended	3 Months Ended			12 Months Ended		6 Months Ended	0 Months Ended	1 Months Ended	6 Months Ended
	Sep. 24, 2013	Aug. 31, 2014	Dec. 31, 2014 item	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2014 item	Dec. 31, 2013	Dec. 31, 2014 item	Nov. 30, 2012	Sep. 24, 2013	Jun. 30, 2014	Mar. 05, 2015 item	Aug. 26, 2014
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 145,000,000									$ 145,000,000
Bank debt owed to DnB ASA paid off		11,400,000		11,400,000
Line of Credit Facility, Current Borrowing Capacity	95,000,000									95,000,000
Repayments of long term lines of credit	46,600,000
Proceeds from borrowings of line of credit	21,000,000
Total principal due			242,888,000			242,888,000	198,229,000	242,888,000
Impairment Loss						38,213,000
Line of Credit Facility, Bank Fees					800,000	1,400,000
Line of Credit Facility, Third Party Fees						148,000
Number of loan facilities						2
Percentage of equity position guaranteed						20.00%
Percentage of equity position						25.00%
Amount of guarantee						3,600,000	3,900,000
Semi-annual reduction in guarantee through December 2018						165,000
Amount of non-amortizing guarantee						1,000,000
Percentage of overall bank guarantee						25.00%
Amount of facility covered by overall bank guarantee						11,000,000
Amount of guarantee after reduction in December 2017						510,000
Number of lenders who elected to adjust definition of EBITDA						2
Percentage of consolidated net income from future periods added due to impairment losses deducted in full from base and excluded for the future adjustments to base						50.00%
Aggregate net book value of secured assets			244,500,000			244,500,000		244,500,000
2015			23,400,000			23,400,000		23,400,000
2016			24,200,000			24,200,000		24,200,000
2017			26,900,000			26,900,000		26,900,000
2018			120,300,000			120,300,000		120,300,000
2019			9,100,000			9,100,000		9,100,000
Thereafter			39,000,000			39,000,000		39,000,000
Number of non-performing assets identified			5
Number of assets held for sale impairment was recorded on			1
Number of held for sale assets sold prior to December 31, 2014						1
Number of held for sale assets being actively marketed						3
Line of credit, increase						15,000,000
Possible amount of bank financing for construction and renovation of future corporate office						6,900,000
Amount received from the State of Louisiana						4,579,000
Incentives from the State of Louisiana expected to receive during 2015						600,000
Amount of remaining cost of building construction to be funded by cash on hand						6,900,000
Subsequent Event [Member]
Line of Credit Facility [Line Items]
Number of held for sale assets sale was finalized for												1
Loan Agreement [Member]
Line of Credit Facility [Line Items]
One third pre-month funding of upcoming quarterly debt payment, amount				387,000
Loan Agreement [Member] | DVB Bank SE [Member]
Line of Credit Facility [Line Items]
Fixed rate (in hundredths)				4.35%									4.35%
Number of quarterly payments						24		24
Final quarterly balloon payment			20,700,000	20,700,000		20,700,000		20,700,000
Deferred loan costs				519,000
Term loan facility principal amount				38,500,000									38,500,000
Loan Agreement [Member] | RBS Asset Finance [Member]
Line of Credit Facility [Line Items]
Deferred loan costs				230,000
Old unamortized loan costs				225,000
Basis spread on variable interest rate		2.75%		2.75%
Number of monthly payments						84		84
Term loan facility principal amount		23,000,000		23,000,000
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Term of financing agreement in years									5 years
Senior Secured Credit Facility [Member]
Line of Credit Facility [Line Items]
Term loan facility principal amount	45,000,000		45,000,000			45,000,000		45,000,000		45,000,000
Line of credit	50,000,000		50,000,000			50,000,000		50,000,000		50,000,000
Number of lenders	4									4
Lender commitments, minimum	15,000,000									15,000,000
Lender commitments, maximum	30,000,000									30,000,000
Total principal due			38,500,000			38,500,000		38,500,000
Additional Term Loan [Member]
Line of Credit Facility [Line Items]
Proceeds from borrowings of line of credit										50,000,000
Standby Letters Of Credit [Member]
Line of Credit Facility [Line Items]
Line of credit	20,000,000		20,000,000			20,000,000		20,000,000		20,000,000
Swingline Loans [Member]
Line of Credit Facility [Line Items]
Line of credit	5,000,000		5,000,000			5,000,000		5,000,000		5,000,000
Line Of Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Amount Outstanding			7,800,000			7,800,000		7,800,000
Line of Credit Facility, Remaining Borrowing Capacity			3,700,000			3,700,000		3,700,000
Consolidated Leverage Ratio						5.00%
Minimum Liquidity Amount						20,000,000
Minimum fixed charge coverage ratio						1.10%
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						1.20%
Future Minimum Fixed Charge Coverage Ratio after June 30, 2016						1.25%
Minimum Net Worth						$ 228,000,000
Consolidated Net Income Earned						50.00%
Percent Of The Proceeds Of Issuances Of Equity Interests Received						100.00%
Number of lessors who agreed to defer the date when a more stringent leverage ratio and increased liquidity would be attained						2
ING Bank [Member]
Line of Credit Facility [Line Items]
Term of financing agreement in years						7 years