Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Numerator:
Net income (loss) attributable to common shareholders	$ (2,504)	$ 20,386
Less: dividends paid on unvested share-based compensation	(73)	(83)
Net income (loss) available to common shareholders	$ (2,577)	$ 20,303
Denominator:
Weighted-average number of common shares — basic (in shares)	130,431,074	68,876,444
Effect of dilutive share-based compensation (in shares)	0	331,604
Weighted-average number of common shares — diluted (in shares)	130,431,074	69,208,048
Net income (loss) per share available to common shareholders — basic (in usd per share)	$ (0.02)	$ 0.29
Net income (loss) per share available to common shareholders — diluted (in usd per share)	$ (0.02)	$ 0.29
Antidilutive securities excluded from computation of earnings per share (in shares)	179,476	4,212