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5.5% Series B Cumulative Convertible Preferred Stock (Details) $ / shares in Units, $ in Thousands |  |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Apr. 05, 2017 USD ($) shares | Mar. 07, 2017 USD ($) $ / shares shares | Apr. 26, 2016 USD ($) $ / shares shares | Sep. 30, 2017 USD ($) $ / shares shares | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) day $ / shares shares | Sep. 30, 2016 USD ($) | Dec. 31, 2016 shares
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Preferred dividends | $ |  |  |  | $ 1,707 | $ 994 | $ 5,087 | $ 2,866 |
Series B Preferred Stock [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Preferred stock dividend rate |  | 5.50% | 5.50% |  |  | 5.50% |  |
Initial conversion price (in dollars per share) | $ / shares |  |  |  | $ 18.90 |  | $ 18.90 |  |
Preferred stock conversion rate |  |  |  |  |  | 1.3228 |  |
Consecutive trading days | day |  |  |  |  |  | 45 |  |
Days ending prior to notice of conversion |  |  |  |  |  | 3 days |  |
Issuance of common stock (in shares) | shares |  | 2,000,000 | 290,850 |  |  |  |  |
Issuance of preferred stock (in dollars per share) | $ / shares |  | $ 20.19 | $ 17.24 |  |  |  |  |
Proceeds from issuance of preferred stock | $ |  | $ 39,900 | $ 5,000 |  |  |  |  |
Proceeds from issuance of stock, net of discounts and expenses | $ |  | $ 38,200 | $ 4,200 |  |  |  |  |
Liquidation preference per share (in dollars per share) | $ / shares |  | $ 25.00 | $ 25.00 |  |  |  |  |
Series B preferred stock, shares outstanding (in shares) | shares |  |  |  | 4,965,850 |  | 4,965,850 |  | 2,890,850
Annual preferred stock dividend (in dollars per share) | $ / shares |  |  |  |  |  | $ 1.375 |  |
Series B Preferred Stock [Member] | Over-Allotment Option [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Issuance of common stock (in shares) | shares | 100,000 |  |  |  |  |  |  |
Proceeds from issuance of stock, net of discounts and expenses | $ | $ 1,900 |  |  |  |  |  |  |
Series B Preferred Stock [Member] | Minimum |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Percent of conversion price |  |  |  | 110.00% |  | 110.00% |  |

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