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Stockholders' Equity - Narrative (Details) $ / shares in Units, $ in Thousands |  |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 15, 2017 | Oct. 13, 2017 USD ($) $ / shares shares | Apr. 22, 2015 USD ($) $ / shares shares | Jun. 04, 2013 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) director quarter $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) $ / shares | Aug. 10, 2017 USD ($) $ / shares | Mar. 20, 2015 USD ($)
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) | shares |  |  |  |  | 200,000,000 | 200,000,000 |  |  |
Preferred stock, par value (in dollars per share) |  |  |  |  | $ 0.01 | $ 0.01 |  |  |
Preferred stock, shares issued (in shares) | shares |  |  |  |  | 12,000,000 | 6,600,000 |  |  |
Preferred stock, shares outstanding (in shares) | shares |  |  |  |  | 12,000,000 | 6,600,000 |  |  |
Preferred stock issuance proceeds, net | $ |  |  |  |  | $ 130,496 | $ 0 | $ 86,862 |  |
Common stock dividend per share (in dollars per share) |  |  |  |  | $ 0.8 | $ 0.96 | $ 1.02 |  |
Common stock, par value (in dollars per share) |  |  |  |  | 0.01 | 0.01 |  |  |
Ordinary Income |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Common stock dividend per share (in dollars per share) |  |  |  |  | 0.46 | 0.435112 | 0.399764 |  |
Capital Gain Distribution |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Common stock dividend per share (in dollars per share) |  |  |  |  | 0.17 |  | 0.065284 |  |
Return of Capital |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Common stock dividend per share (in dollars per share) |  |  |  |  | $ 0.17 | $ 0.524624 | $ 0.554952 |  |
Equity Distribution Agreements |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Stock issued (in shares) | shares |  |  |  |  | 55,886 |  |  |  |
Common stock subscriptions (up to) | $ |  |  |  |  |  |  |  | $ 100,000 | $ 39,300
Common stock, par value (in dollars per share) |  |  |  |  |  |  |  | $ 0.01 |
Share price (in dollars per share) |  |  |  |  | $ 6.45 |  |  |  |
Net proceeds | $ |  |  |  |  | $ 400 |  |  |  |
Common stock reserved for future issuance | $ |  |  |  |  | $ 99,600 |  |  |  |
Prior Equity Distribution Agreements |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Stock issued (in shares) | shares |  |  |  |  | 87,737 | 1,905,206 |  |  |
Share price (in dollars per share) |  |  |  |  | $ 6.68 | $ 6.87 |  |  |
Net proceeds | $ |  |  |  |  | $ 600 | $ 12,800 |  |  |
Series B and C Preferred Stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Minimum number of quarters without dividends that result in voting rights | quarter |  |  |  |  | 6 |  |  |  |
Number of additional directors elected | director |  |  |  |  | 2 |  |  |  |
Preferred stock, percentage of stockholders required for term changes |  |  |  |  | 66.67% |  |  |  |
Series B Preferred Stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) | shares |  |  |  |  | 6,000,000 | 6,000,000 |  |  |
Preferred stock, par value (in dollars per share) |  |  |  | $ 0.01 | $ 0.01 | $ 0.01 |  |  |
Preferred stock, shares issued (in shares) | shares |  |  |  |  | 3,000,000 | 3,000,000 |  |  |
Preferred stock, shares outstanding (in shares) | shares |  |  |  |  | 3,000,000 | 3,000,000 |  |  |
Stock issued (in shares) | shares |  |  |  | 3,000,000 |  |  |  |  |
Preferred stock, Series B cumulative redeemable, dividend rate (as a percent) |  |  |  | 7.75% | 7.75% | 7.75% |  |  |
Preferred stock, liquidation preference (in dollars per share) |  |  |  | $ 25 | $ 25 | $ 25 |  |  |
Preferred stock issuance proceeds, net | $ |  |  |  | $ 72,400 |  |  |  |  |
Preferred stock, redemption price per share |  |  |  |  | $ 25.00 |  |  |  |
Preferred stock, redemption term |  |  |  |  | 120 days |  |  |  |
Series C Preferred Stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) | shares |  |  |  |  | 4,140,000 | 4,140,000 |  |  |
Preferred stock, par value (in dollars per share) |  |  | $ 0.01 |  | $ 0.01 | $ 0.01 |  |  |
Preferred stock, shares issued (in shares) | shares |  |  | 3,600,000 |  | 3,600,000 | 3,600,000 |  |  |
Preferred stock, shares outstanding (in shares) | shares |  |  |  |  | 3,600,000 | 3,600,000 |  |  |
Preferred stock, Series B cumulative redeemable, dividend rate (as a percent) |  |  | 7.875% |  | 7.875% | 7.875% |  |  |
Preferred stock, liquidation preference (in dollars per share) |  |  | $ 25 |  | $ 25 | $ 25 |  |  |
Preferred stock issuance proceeds, net | $ |  |  | $ 86,900 |  |  |  |  |  |
Preferred stock, redemption price per share |  |  |  |  | $ 25.00 |  |  |  |
Preferred stock, redemption term |  |  |  |  | 120 days |  |  |  |
Series D Preferred Stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) | shares |  | 5,750,000 |  |  | 5,750,000 |  |  |  |
Preferred stock, par value (in dollars per share) |  | $ 0.01 |  |  | $ 0.01 |  |  |  |
Preferred stock, shares issued (in shares) | shares |  | 5,400,000 |  |  | 5,400,000 |  |  |  |
Preferred stock, shares outstanding (in shares) | shares |  |  |  |  | 5,400,000 |  |  |  |
Preferred stock, Series B cumulative redeemable, dividend rate (as a percent) | 5.695% | 8.00% |  |  | 8.00% |  |  |  |
Preferred stock, liquidation preference (in dollars per share) |  | $ 25 |  |  | $ 25 |  |  |  |
Preferred stock issuance proceeds, net | $ |  | $ 130,500 |  |  |  |  |  |  |

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