Equity - Changes in accumulated deficit (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Equity [Abstract]
Balance as of December 31, 2013			$ (16,244)
Net income	2,599	(1,153)	4,344	1,011
Dividends paid			(39,905)
Balance as of September 30, 2014	$ (51,805)		$ (51,805)