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Stockholders' Equity / (Deficit) - Stockholder Rights Plan (Details) - $ / shares | Sep. 30, 2018 | Jul. 22, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Preferred stock, par value | $ 0.01 |  | $ 0.01
Rights |  |  |
Ownership trigger threshold |  | 15.00% |
Number of preferred share purchase rights granted for each outstanding share of common stock |  | 1 |
Exercise price per right |  | $ 250.00 |
Ratio of market price to exercise price if beneficial ownership is acquired without prior board approval |  | 2 |
Rights | Series A Junior Participating Preferred Stock |  |  |
Number of shares of stock available to purchase per right |  | 0.001 |
Preferred stock, par value |  | $ 0.01 |
Rights | John H. Schnatter with his affiliates and family members |  |  |
Ownership trigger threshold |  | 31.00% |

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