Long-Term Debt (Schedule of Deferred Financing Costs) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Term Loan Maturing June 2018 [Member]
Debt Instrument [Line Items]
Gross Carrying Amount	$ 3,638	[1]	$ 3,638	[1]
Accumulated Amortization	(909)	[1]	(364)	[1]
Net	2,729	[1]	3,274	[1]
Revolving Credit Facility Maturing June 2018 [Member]
Debt Instrument [Line Items]
Gross Carrying Amount	13,275	[1]	13,275	[1]
Accumulated Amortization	(3,319)	[1]	(1,327)	[1]
Net	9,956	[1]	11,948	[1]
Convertible Senior Notes 2032 [Member]
Debt Instrument [Line Items]
Gross Carrying Amount	3,759		3,759
Accumulated Amortization	(1,609)		(1,148)
Net	2,150		2,611
MARAD Debt [Member]
Debt Instrument [Line Items]
Gross Carrying Amount	12,200		12,200
Accumulated Amortization	(6,101)		(5,736)
Net	6,099		6,464
Nordea Term Loan [Member]
Debt Instrument [Line Items]
Gross Carrying Amount	3,143
Net	3,143
Debt [Member]
Debt Instrument [Line Items]
Gross Carrying Amount	36,015		32,872
Accumulated Amortization	(11,938)		(8,575)
Net	$ 24,077		$ 24,297

[1] Relates to amounts allocated to the existing Term Loan and Revolving Credit Facility, which became effective in June 2013.