Earnings Per Share - Basic and Diluted Components (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Numerator:
Net (loss) income attributable to common shareholders	$ (11,780)	$ (11,077)	$ (55,800)	$ (88,600)	$ (62,800)
Denominator:
Weighted average number of common shares outstanding	180,125,763	173,365,830