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Earnings Per Share - Calculation of EPS (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Numerator:
Net income	$ 4,338	$ 8,887
Denominator:
Weighted-average number of common shares outstanding—basic (in shares)	201,145,014	200,654,092
Effect of dilutive securities:
Weighted-average number of common shares outstanding—diluted (in shares)	201,775,832	201,837,582
Earnings per share:
Basic earnings per share (in dollars per share)	$ 0.02	$ 0.04
Diluted earnings per share (in dollars per share)	$ 0.02	$ 0.04
Unvested restricted common stock
Effect of dilutive securities:
Unvested restricted common stock and shares related to unvested PSUs (in shares)	294,613	236,081
Shares related to unvested PSUs
Effect of dilutive securities:
Unvested restricted common stock and shares related to unvested PSUs (in shares)	336,205	947,409

X

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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