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Stockholders' Equity - Narrative (Details)					3 Months Ended		6 Months Ended	9 Months Ended	12 Months Ended
	Aug. 20, 2018 USD ($) $ / shares shares	Aug. 16, 2018 USD ($)	Apr. 01, 2017 shares	Feb. 28, 2017	Sep. 30, 2018 USD ($) $ / shares shares	Jun. 30, 2017 shares	Jun. 30, 2018	Sep. 30, 2018 USD ($) $ / shares shares	Dec. 31, 2017 $ / shares shares	Mar. 31, 2018 USD ($)
Conversion of Stock [Line Items]
Common stock, outstanding (shares) | shares					72,071,542			72,071,542	67,287,231
Conversion of stock (shares) | shares			181,841			181,841
Preferred stock, authorized (shares) | shares					16,670,000			16,670,000
Common stock dividend rate (usd per share) | $ / shares								$ 2.13
Common stock, monthly dividend rate (usd per share) | $ / shares								$ 0.1775
Public Offering
Conversion of Stock [Line Items]
Number of shares issued (shares) | shares	4,600,000
Gross proceeds from sale of stock	$ 95,000,000.0
Offering transaction costs	$ 3,800,000
Offering price per share (usd per share) | $ / shares	$ 20.65
Over-Allotment Option
Conversion of Stock [Line Items]
Number of shares issued (shares) | shares	600,000
Additional offering transaction costs		$ 300,000
Agent | At-the-Market Program
Conversion of Stock [Line Items]
Aggregate common stock offering price								$ 175,000,000
Number of shares issued (shares) | shares					164,927,000			164,927
Gross proceeds from sale of stock					$ 3,500,000			$ 3,500,000
Commissions paid					35,000			35,140,000
Payments of stock offering costs					$ 300,000			$ 300,000
OP Units
Conversion of Stock [Line Items]
Reverse stock split conversion ratio				0.3333
LTIP Units
Conversion of Stock [Line Items]
Reverse stock split conversion ratio				0.3333
Common Stock
Conversion of Stock [Line Items]
Reverse stock split conversion ratio				0.3333
Redeemable Preferred Stock
Conversion of Stock [Line Items]
Preferred stock, outstanding (shares) | shares					5,416,890			5,416,890	5,409,650
Preferred stock, dividend rate							7.25%	7.25%	7.25%
Preferred stock, par value (usd per share) | $ / shares					$ 0.01			$ 0.01	$ 0.01
Preferred stock, issued (shares) | shares					5,416,890			5,416,890	5,409,650
Preferred stock, authorized (shares) | shares					13,409,650			13,409,650	5,409,650
Dividend payout (usd per share) | $ / shares					$ 0.453125
Preferred stock, liquidation preference (usd per share) | $ / shares					$ 25			$ 25	$ 25
Redeemable Preferred Stock | Maximum
Conversion of Stock [Line Items]
Periods for dividend payment								30 days
Redeemable Preferred Stock | Minimum
Conversion of Stock [Line Items]
Periods for dividend payment								10 days
Redeemable Preferred Stock | Agent | At-the-Market Program
Conversion of Stock [Line Items]
Number of shares issued (shares) | shares					3,225			7,240
Gross proceeds from sale of stock					$ 81,009			$ 200,000
Commissions paid					(1,220)			(2,724)
Payments of stock offering costs					$ 100,000			$ 400,000
Aggregate preferred stock offering price										$ 200,000,000

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