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Stockholders' Equity / (Deficit) - Stockholder Rights Plan (Details) - $ / shares | Jul. 22, 2018 | Jul. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Preferred stock, par value |  | $ 0.01 | $ 0.01
Subsequent event | 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 |  |
Subsequent event | 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 |  |
Subsequent event | Rights | John H. Schnatter with his affiliates and family members |  |  |
Ownership trigger threshold | 31.00% |  |

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