Earnings (Loss) Per Common Share - Calculation of Basic and Diluted EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Numerator:
Net income (loss)	$ 21,552	$ 18,935	$ 19,325	$ (10,054)	$ 19,698	$ 16,053	$ 59,812	$ 25,697
Less: Net income allocated to participating securities	(75)			(66)			(224)	(231)
Numerator for basic and diluted earnings (loss) available to common stockholders	$ 21,477			$ (10,120)			$ 59,588	$ 25,466
Denominator:
Weighted-average basic common shares outstanding (in shares)	95,214			95,103			95,195	92,409
Weighted-average diluted common shares outstanding (in shares)	95,214			95,103			95,195	92,409
Earnings (loss) per common share, basic (in usd per share)	$ 0.23			$ (0.11)			$ 0.63	$ 0.28
Earnings (loss) per common share, diluted (in usd per share)	$ 0.23			$ (0.11)			$ 0.63	$ 0.28