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5.5% Series B Cumulative Convertible Preferred Stock (Details) $ / shares in Units, $ in Thousands |  |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Apr. 26, 2016 USD ($) $ / shares shares | Dec. 04, 2015 $ / shares | Jun. 09, 2015 USD ($) $ / shares shares | Jun. 30, 2016 USD ($) shares | Jun. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) $ / shares shares | Jun. 30, 2015 USD ($) | Dec. 31, 2015 shares
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Preferred stock conversion rate |  | 1.3228 |  |  |  |  |  |
Preferred dividends | $ |  |  |  | $ 978 | $ 198 | $ 1,872 | $ 198 |
Series A Preferred Stock [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Series B preferred stock, shares issued (in shares) | shares |  |  | 2,600,000 |  |  |  |  |
Preferred stock dividend rate |  | 5.50% | 5.50% |  |  |  |  |
Preferred stock, par value (in dollars per share) |  | $ 0.01 |  |  |  |  |  |
Issuance of preferred stock (in dollars per share) |  |  | $ 25.00 |  |  |  |  |
Underwriting discount | $ |  |  | $ 1,500 |  |  |  |  |
Issuance of preferred stock, net of discount (in dollars per share) |  |  | $ 24.4125 |  |  |  |  |
Proceeds from issuance of stock, net of discounts and Expenses | $ |  |  | $ 62,200 |  |  |  |  |
Series B Preferred Stock [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Series B preferred stock, shares issued (in shares) | shares |  |  |  | 2,890,850 |  | 2,890,850 |  | 2,600,000
Preferred stock dividend rate | 5.50% | 5.50% |  |  |  |  |  |
Liquidation preference per share | $ 25.00 |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) |  | $ 0.01 |  |  |  |  |  |
Issuance of preferred stock (in dollars per share) | $ 17.24 |  |  |  |  |  |  |
Proceeds from issuance of preferred stock | $ | $ 5,000 |  |  |  |  |  |  |
Proceeds from issuance of stock, net of discounts and Expenses | $ | $ 4,200 |  |  |  |  |  |  |
Series B preferred stock, shares outstanding (in shares) | shares |  |  |  | 2,900,000 |  | 2,900,000 |  | 2,600,000
Initial conversion price (in dollars per share) |  | $ 18.90 |  |  |  |  |  |
Consecutive trading days |  |  |  |  |  | 45 days |  |
Days ending prior to notice of conversion |  |  |  |  |  | 3 days |  |
Stock issued (in shares) | shares | 290,850 |  |  |  |  |  |  |
Annual preferred stock dividend |  |  |  |  |  | $ 1.375 |  |
Minimum | Series B Preferred Stock [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Percent of conversion price |  |  |  | 110.00% |  | 110.00% |  |

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