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Stockholders' Equity - Narrative (Details) - $ / shares | Sep. 30, 2018 | Dec. 31, 2017
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Class Of Stock [Line Items] |  |
Common stock, shares authorized (in shares) | 75,000,000 | 75,000,000
Par value of common stock (in dollars per share) | $ 0.01 |
Preferred stock, shares authorized (in shares) | 3,500,000 | 3,500,000
Par value of preferred stock per share (in dollars per share) | $ 0.01 | $ 0.01
Preferred stock, shares issued (in shares) | 0 |
Maximum |  |
Class Of Stock [Line Items] |  |
Number of shares authorized to be repurchased (in shares) | 600,000 |

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