Earnings Per Common Share - Calculation of Basic and Diluted EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Numerator:
Net (loss) income	$ 18,935	$ 19,325	$ 19,698	$ 16,053	$ 38,260	$ 35,751
Less: Net income allocated to participating securities	(75)		(79)		(148)	(165)
Numerator for basic and diluted earnings available to common stockholders	$ 18,860		$ 19,619		$ 38,112	$ 35,586
Denominator:
Weighted-average basic common shares outstanding (in shares)	95,208		94,036		95,185	91,039
Weighted-average diluted common shares outstanding (in shares)	95,208		94,036		95,185	91,039
Earnings per common share, basic (in usd per share)	$ 0.20		$ 0.21		$ 0.40	$ 0.39
Earnings per common share, diluted (in usd per share)	$ 0.20		$ 0.21		$ 0.40	$ 0.39