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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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