Financial Highlights (Results of Operations for a Share Outstanding) (Details) - $ / shares	12 Months Ended
Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2017
Increase (Decrease) Equity Per Share [Roll Forward]
Beginning Shareholders' Equity Per Share (December 31, 2017)	$ 19.15
Net Investment Income	1.42
Net Realized/Unrealized Gains (Losses)	0.23
Results of Operations Attributable to Equity	1.65
Less: Results of Operations Attributable to Non-controlling Interests	(0.11)
Results of Operations Attributable to Shareholders' Equity	1.54
Dividends Paid to Common Shareholders	(1.64)
Weighted Average Share Impact on Dividends Paid	(0.03)
Accretive (Dilutive) Effect of Share Issuances (Net of Offering Costs), Share Repurchases, and Adjustments to Non-controlling Interest	(0.10)
Ending Shareholders' Equity Per Share (3/31/2018 and 3/31/2017, respectively)	$ 18.92
Shares Outstanding, end of period	29,796,601	38,647,943	31,335,938
Shareholders Equity Per Share Upon Conversion Of All Convertible Units (in usd per share)	$ 18.92

Per share impact of share issuances/repurchases, or adjustments to non-controlling interests.

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Per share dividend amount paid to common shareholders.

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Amount of Net Income (Loss) attributable to noncontrolling interest based on average common shares outstanding during the period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent based on average common shares outstanding during the period.

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The Company's equity per share if all the long term incentive plan units and Operating Partnership units (owned by the non-controlling interest) that have been previously been issued were to be fully vested and exchanged for common shares as of the reporting date.

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Per share impact on dividend amount paid relating to shares issued/repurchased during the period as well as dividends paid to LTIP unit holders.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Per share or unit amount of realized and unrealized gain (loss) on investment.

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Per share or unit amount of investment income (loss) and realized and unrealized gain (loss) on investment.

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Per share or unit amount, after investment expense, of dividend and interest investment income (loss).

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Net asset value per share or per unit of investments in certain entities that calculate net asset value per share. Includes, but is not limited to, by unit, membership interest, or other ownership interest. Investment includes, but is not limited to, investment in certain hedge funds, venture capital funds, private equity funds, real estate partnerships or funds. Excludes fair value disclosure.

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