Earnings Per Share (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Numerator:
Net loss attributable to common shareholders	$ (10,238)	$ (9,377)	$ (30,568)	$ (81,461)	$ (88,600)	$ (62,800)	$ (31,900)
Denominator:
Weighted Average Number of Shares Outstanding, Basic	177,369,017	169,557,223	174,724,746	154,539,225
Weighted average number of common shares outstanding	177,369,017	169,557,223	174,724,746	154,539,225