Net (Loss) Income Per Common Share - Calculation of Basic and Diluted Net (Loss) Income Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Numerator for basic and diluted net (loss) income per share:
Net (loss) income													$ (61,833)	$ 3,070	$ 338
Series B preferred stock dividends													(17,748)
Preferred deemed dividend														(9,455)
Net (loss) income attributable to common and participating stockholders	$ 5,568	$ (8,419)	$ (77,983)	$ 1,253	$ (9,573)	$ (1,299)	$ 17,322	$ (12,835)	$ 7,516	$ (878)	$ (2,484)	$ (3,816)	$ (79,581)	$ (6,385)	$ 338
Denominator for basic and diluted net (loss) income per share:
Weighted-average shares outstanding													204,776,405	202,208,619	201,419,306
Weighted-average unvested restricted shares outstanding													(3,029,792)	(1,338,691)	(1,115,238)
Denominator for basic and diluted net (loss) income per share:													201,746,613	200,869,928	200,304,068
Basic and diluted net (loss) income per share attributable to common and participating stockholders													$ (0.39)	$ (0.03)	$ 0.00