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Earnings Per Share - Calculation of EPS (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Numerator:
Net income	$ 31,443	$ 21,623	$ 63,790	$ 67,105
Denominator:
Weighted-average number of common shares outstanding—basic (in shares)	208,758,945	200,834,910	204,520,637	200,767,104
Effect of dilutive securities:
Weighted-average number of common shares outstanding—diluted (in shares)	209,597,037	201,424,400	205,349,762	201,353,649
Earnings per share:
Basic earnings per share (in dollars per share)	$ 0.15	$ 0.11	$ 0.31	$ 0.33
Diluted earnings per share (in dollars per share)	$ 0.15	$ 0.11	$ 0.31	$ 0.33
Unvested restricted common stock
Effect of dilutive securities:
Unvested restricted common stock and shares related to unvested PSUs (in shares)	221,018	173,557	212,051	170,612
Shares related to unvested PSUs
Effect of dilutive securities:
Unvested restricted common stock and shares related to unvested PSUs (in shares)	617,074	415,933	617,074	415,933

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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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