Significant Accounting Policies - Authorized Stock (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended				3 Months Ended				12 Months Ended
	Aug. 10, 2020	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounting Policies [Abstract]
Common stock, shares authorized (in shares)		32,000,000				32,000,000				32,000,000	32,000,000
Common stock, par value (in dollars per share)		$ 0.01				$ 0.01				$ 0.01	$ 0.01
Common stock, shares issued (in shares)		24,592,098				24,592,098				24,592,098	24,418,939
Common stock, shares outstanding (in shares)		24,592,098				24,592,098				24,592,098	24,418,939
Issuance of common stock in public offering (in shares)	2,185,000
Net proceeds from issuance of common stock	$ 220,200									$ 0	$ 220,248	$ 0
Payments of stock issuance costs	$ 9,200
Preferred stock, shares authorized (in shares)		8,000,000				8,000,000				8,000,000	8,000,000
Preferred stock, shares issued (in shares)		0				0				0	0
Preferred stock, shares outstanding (in shares)		0				0				0	0
Dividends declared (USD per share)						$ 0.60	$ 0.60	$ 0.60	$ 0.60	$ 2.40	$ 2.40	$ 2.10
Dividends paid (USD per share)		$ 0.60	$ 0.60	$ 0.60	$ 0.60