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Shareholder Rights Plan (Details) - Series A Preferred Stock - $ / shares | Oct. 08, 2015 | Dec. 15, 2008
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Equity, Class of Treasury Stock [Line Items] |  |
Class of warrant or right, number of securities called by warrants or rights (in shares) |  | 0.001
Class of warrant or right, exercise price (usd per share) |  | $ 51.60
Expiration period |  | 10 years
Common stock ownership threshold |  | 15.00%
Collective ownership threshold for joint filers | 19.90% |

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