Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Vessels, accumulated depreciation	$ 52,459	$ 36,906
Deferred drydock, accumulated amortization	0	0
Fixed assets, accumulated depreciation	47	36
Deferred financing costs, accumulated amortization	$ 1,785	$ 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)	51,168,896	17,300,999
Common stock, shares outstanding (in shares)	51,168,896	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)	6,356,471	5,699,088
Common stock, shares outstanding (in shares)	6,356,471	5,699,088