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Organization, Operations and Basis of Presentation (Details) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 16, 2016 | Sep. 30, 2018 USD ($) $ / shares shares | Sep. 30, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | May 04, 2018 USD ($) | Oct. 01, 2016 $ / shares
Accounting Policies [Abstract] |  |  |  |  |  |
Common stock par value (in dollars per share) | $ / shares |  | $ 0.01 | $ 0.01 | $ 0.01 |  | $ 0.01
Shares received, conversion ratio | 0.04 |  |  |  |  |
Liabilities to creditors, payments issued but outstanding |  |  | $ 8,200,000 | $ 8,500,000 |  |
Share repurchase program, maximum amount of shares authorized to be repurchased |  |  |  |  | $ 75,000,000 |
Common stock, shares outstanding (in shares) | shares |  | 29,991,468 | 29,991,468 | 30,482,966 |  |
Stock repurchased during period (in shares) | shares |  | 475,175 | 545,282 |  |  |
Stock repurchased during period, value |  | $ 17,300,000 | $ 19,700,000 |  |  |
Treasury stock acquired, weighted average cost per share (in dollars per share) | $ / shares |  | $ 35.70 | $ 36.06 |  |  |
Stock repurchase program, remaining authorized repurchase amount |  | $ 55,300,000 | $ 55,300,000 |  |  |

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