Summary of Significant Accounting Policies - Common Stock Distributions (Details) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Tax status of common stock distributions deemed paid during the year:
Ordinary income (usd per share)	$ 1.538	$ 1.234	$ 1.241
Long-term capital gains (usd per share)	0	0.006	0
Non-dividend distributions (usd per share)	0	0.057	0
Distributions declared per common stock outstanding (usd per share)	$ 1.538	$ 1.297	$ 1.241