Long-Term Debt (Deferred Financing Costs) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Term Loan Maturing June 2018 [Member]
Debt Instrument [Line Items]
Gross carrying amount	$ 3,638	$ 3,638
Accumulated amortization	(1,637)	(1,091)
Net	2,001	2,547
Revolving Credit Facility Maturing June 2018 [Member]
Debt Instrument [Line Items]
Gross carrying amount	14,787	13,275
Accumulated amortization	(6,137)	(3,982)
Net	8,650	9,293
Convertible Senior Notes 2032 [Member]
Debt Instrument [Line Items]
Gross carrying amount	3,759	3,759
Accumulated amortization	(2,224)	(1,763)
Net	1,535	1,996
MARAD Debt [Member]
Debt Instrument [Line Items]
Gross carrying amount	12,200	12,200
Accumulated amortization	(6,589)	(6,223)
Net	5,611	5,977
Nordea Q5000 Loan [Member]
Debt Instrument [Line Items]
Gross carrying amount	3,685	3,586
Accumulated amortization	(300)
Net	3,385	3,586
Debt [Member]
Debt Instrument [Line Items]
Gross carrying amount	38,069	36,458
Accumulated amortization	(16,887)	(13,059)
Net	$ 21,182	$ 23,399