Summary of Significant Accounting Policies - Common Stock Distributions (Details) - $ / shares	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Tax status of common stock distributions deemed paid during the year:
Ordinary income (usd per share)	$ 1.241	$ 1.069	$ 0.829
Long-term capital gains (usd per share)	0	0	0.359
Nondividend distributions (usd per share)	0	0	0
Distributions declared per Common Share outstanding (usd per share)	$ 1.241	$ 1.069	$ 1.188

Represents the portion of common stock dividends declared or paid during the period that are taxable as ordinary income.

No definition available.

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Period Type:	duration