Quarterly Financial Information (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended									9 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Oct. 15, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Quarterly Financial Information (Unaudited) [Abstract]
Total revenues		$ 26,721	$ 1,670	$ 1,299	$ 1,139	$ 901	$ 849	$ 1,139	$ 956		$ 30,829	$ 3,845	$ 3,431
Total operating costs and expenses		20,783	27,081	22,540	19,538	21,533	18,507	18,393	16,416		89,942	74,849	43,818
Operating loss		5,938	(25,411)	(21,241)	(18,399)	(20,632)	(17,658)	(17,254)	(15,460)		(59,113)	(71,004)	(40,387)
Net loss		5,549	(25,406)	(21,237)	(18,397)	(20,627)	(17,655)	(17,252)	(15,458)	(68,019)	(59,491)	(70,992)	(40,373)
Earnings Per Share [Abstract]
Limited partners' interest in net income subsequent to initial public offering	$ 8,528
Earnings Per Share, Basic	$ 0.19
Earnings Per Share, Diluted	$ 0.19
Earnings Per Share, Basic and Diluted, Subordinated Units	$ 0.19
Weighted Average Number of Shares Outstanding, Basic	22,811
Weighted Average Number of Shares Outstanding, Diluted	22,813
Weighted Average Number Of Subordinated Units Outstanding, Basic and Diluted	22,811