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Stockholders' Equity - Summary of Capital Structure (Details) - $ / shares | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Dec. 31, 2015
Class Of Stock [Line Items] |  |
Number of shares authorized | 50,000,000 | 50,000,000
Number of shares issued | 18,153,828 | 18,052,723
Number of shares outstanding | 18,106,978 | 18,018,200
Par value per share | $ 0.01 | $ 0.01
Number of shares outstanding, treasury stock | 46,850 | 34,523
Preferred Stock - Series A |  |
Class Of Stock [Line Items] |  |
Number of shares authorized | 50,000 | 50,000
Number of shares issued | 45,500 | 45,500
Number of shares outstanding | 45,500 | 45,500
Par value per share | $ 0.01 | $ 0.01
Liquidation preference per share | $ 100 | $ 100
Dividend rate | Prime + 2% | Prime + 2%
Dividend rate - floor | 8.00% | 8.00%
Subsequent dividend payment dates | Quarterly | Quarterly
Convertible to common stock | Yes | Yes
Conversion period | Anytime | Anytime
Conversion ratio - preferred to common | 6.94008 | 6.94008
Preferred Stock - Series B |  |
Class Of Stock [Line Items] |  |
Number of shares authorized | 115,000 | 115,000
Number of shares issued | 51,956 | 51,956
Number of shares outstanding | 51,956 | 51,956
Par value per share | $ 0.01 | $ 0.01
Liquidation preference per share | $ 100 | $ 100
Dividend rate | 8.00% | 8.00%
Dividend rate - floor | 8.00% | 8.00%
Subsequent dividend payment dates | Quarterly | Quarterly
Convertible to common stock | Yes | Yes
Conversion period | Anytime | Anytime
Conversion ratio - preferred to common | 6.94008 | 6.94008

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