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Earnings Per Share - Calculation of EPS (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Numerator:
Net income	$ 24,006	$ 31,443	$ 28,009	$ 4,338	$ 24,772	$ 21,623	$ 36,595	$ 8,887	$ 87,784	$ 91,877	$ 114,796
Denominator:
Weighted-average number of common shares outstanding—basic (in shares)									205,462,911	200,784,450	201,079,573
Effect of dilutive securities:
Unvested restricted common stock (in shares)									215,655	188,759	47,468
Shares related to unvested PSUs (in shares)									452,584	548,259	549,217
Weighted-average number of common shares outstanding—diluted (in shares)									206,131,150	201,521,468	201,676,258
Net income per share available to common stockholders - basic (in dollars per share)	$ 0.12	$ 0.15	$ 0.14	$ 0.02	$ 0.12	$ 0.11	$ 0.18	$ 0.04	$ 0.43	$ 0.46	$ 0.57
Net income per share available to common stockholders - diluted (in dollars per share)	$ 0.12	$ 0.15	$ 0.14	$ 0.02	$ 0.12	$ 0.11	$ 0.18	$ 0.04	$ 0.43	$ 0.46	$ 0.57

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