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Stockholders' Equity - Narrative (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Aug. 20, 2018 | Mar. 31, 2019 | Sep. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018 | Mar. 31, 2018
Conversion of Stock [Line Items] |  |  |  |  |  |  |  |  |
Common stock, outstanding (shares) |  |  | 89,458,340 |  |  | 89,458,340 |  | 76,080,625 |
Preferred stock, authorized (shares) |  |  | 16,670,000 |  |  | 16,670,000 |  | 16,670,000 |
Common stock dividend rate (usd per share) |  | $ 2.13 |  | $ 2.13 |  |  |  |  |
Common stock, monthly dividend rate (usd per share) |  |  |  | $ 0.1775 |  |  |  |  |
Public Offering |  |  |  |  |  |  |  |  |
Conversion of Stock [Line Items] |  |  |  |  |  |  |  |  |
Number of shares issued (shares) | 4,600,000 |  |  |  |  |  |  |  |
Gross proceeds from sale of stock | $ 95,000,000.0 |  |  |  |  |  |  |  |
Sale of stock (usd per share) | $ 20.65 |  |  |  |  |  |  |  |
Offering transaction costs | $ 3,800,000 |  |  |  |  |  |  |  |
Additional offering transaction costs | $ 300,000 |  |  |  |  |  |  |  |
Underwriters |  |  |  |  |  |  |  |  |
Conversion of Stock [Line Items] |  |  |  |  |  |  |  |  |
Number of shares issued (shares) | 600,000 |  |  |  |  |  |  |  |
Agent | At-the-Market Program |  |  |  |  |  |  |  |  |
Conversion of Stock [Line Items] |  |  |  |  |  |  |  |  |
Number of shares issued (shares) |  |  | 5,596,452 | 7,759,322 | 164,927 | 13,555,774 | 164,927 |  |
Gross proceeds from sale of stock |  |  | $ 109,900,000 | $ 152,800,000 | $ 3,500,000 | $ 262,600,000 | $ 3,500,000 |  |
Commissions paid |  |  | 1,600,000 | 1,500,000 | 35,140,000 | 3,100,000 | 35,140,000 |  |
Payments of stock offering costs |  |  | $ 200,000 | 800,000 | $ 300,000 | $ 1,000,000.0 | $ 300,000 |  |
Aggregate common stock offering price |  |  |  | $ 175,000,000.0 |  |  |  |  |
Redeemable Preferred Stock |  |  |  |  |  |  |  |  |
Conversion of Stock [Line Items] |  |  |  |  |  |  |  |  |
Preferred stock, authorized (shares) |  |  | 13,409,650 |  |  | 13,409,650 |  | 13,409,650 |
Preferred stock, issued (shares) |  |  | 6,682,448 |  |  | 6,682,448 |  | 5,416,890 |
Dividend payout (usd per share) |  |  |  |  |  | $ 0.453125 |  |  |
Preferred stock, dividend rate |  |  |  |  |  | 7.25% |  | 7.25% |
Preferred stock, liquidation preference (usd per share) |  |  | $ 25.00 |  |  | $ 25.00 |  | $ 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) |  |  | 724,600 |  | 3,225 | 1,265,558 | 7,240 |  |
Gross proceeds from sale of stock |  |  | $ 18,500,000 |  | $ 81,009,000 | $ 32,300,000 |  |  |
Commissions paid |  |  | 300,000 |  | 1,215,000 | 500,000 | $ 2,724,000 |  |
Payments of stock offering costs |  |  | $ 100,000 |  | $ 100,000 | $ 200,000 | 400,000 |  |
Aggregate preferred stock offering price |  |  |  |  |  |  |  |  | $ 200,000,000.0
Net proceeds |  |  |  |  |  |  | $ 200,000 |  |

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