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Net Income (Loss) Per Share - Additional Information (Details) (USD $)
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0 Months Ended | 12 Months Ended |
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May 22, 2013
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Dec. 31, 2013
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Common Class A
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| Earnings Per Share [Line Items] | ||
| Proceeds from public offering, net of underwriters' discount, shares | 6,230,000 | |
| Number of shares sold by existing shareholders | 3,200,000 | |
| Votes per share entitled to share holder | 1 | |
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Common Class B
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| Earnings Per Share [Line Items] | ||
| Number of shares sold by existing shareholders | 2,000,000 | |
| Votes per share entitled to share holder | 10 | |
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Series A Preferred Stock
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| Earnings Per Share [Line Items] | ||
| Dividend rate (USD per share) | $ 0.0282 | |
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Series B Preferred Stock
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| Earnings Per Share [Line Items] | ||
| Dividend rate (USD per share) | $ 0.1374 |