Earnings Per Share - Computation of Basic Earnings Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income (loss)	$ (6,654)	$ 41,254	$ 24,437	$ 132,623
Allocation of net income (loss) to common stockholders:
Common stock	(6,654)	41,055	24,331	131,988
Unvested participating shares	0	199	106	635
Net income (loss) available to common shareholders	$ (6,654)	$ 41,254	$ 24,437	$ 132,623
Common Stock
Weighted average common shares outstanding:
Weighted average number of common shares (in shares)	60,196,795	57,935,118	59,253,044	57,820,596
Earnings (loss) per common share:
Common stock (in dollars per share)	$ (0.11)	$ 0.71	$ 0.41	$ 2.28
Restricted Stock | Common Stock
Weighted average common shares outstanding:
Weighted average number of common shares (in shares)	249,567	280,711	258,265	277,750