Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Due from charterers, reserve	$ 70	$ 154
Vessels, accumulated depreciation	48,069	36,906
Fixed assets, accumulated depreciation	44	36
Deferred financing costs, accumulated amortization	$ 1,615	$ 1,204
Common Stock [Member]
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	500,000,000	500,000,000
Common stock, shares issued (in shares)	37,579,896	17,300,999
Common stock, shares outstanding (in shares)	37,579,896	17,300,999
Class B Stock [Member]
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	6,103,471	5,699,088
Common stock, shares outstanding (in shares)	6,103,471	5,699,088