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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Numerator:
Net income attributable to common stockholders	$ 28,960	$ 28,009	$ 37,905	$ 32,347
Dividends declared on unvested share-based compensation	(35)	0	(70)	0
Net income available to common stockholders	$ 28,925	$ 28,009	$ 37,835	$ 32,347
Denominator:
Weighted-average number of common shares outstanding—basic (in shares)	202,405,507	203,574,282	202,610,178	202,366,359
Effect of dilutive securities:
Weighted-average number of common shares outstanding—diluted (in shares)	202,900,639	204,516,142	203,106,490	203,366,890
Earnings per share:
Basic earnings per share (in dollars per share)	$ 0.14	$ 0.14	$ 0.19	$ 0.16
Diluted earnings per share (in dollars per share)	$ 0.14	$ 0.14	$ 0.19	$ 0.16
Unvested restricted common stock
Effect of dilutive securities:
Unvested restricted common stock and shares related to unvested PSUs (in shares)	68,995	148,608	58,084	207,279
Shares related to unvested PSUs
Effect of dilutive securities:
Unvested restricted common stock and shares related to unvested PSUs (in shares)	426,137	793,252	438,228	793,252

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