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Capital Transactions - Restricted Stock Units (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
RSUs |  |  |
Share-based compensation, additional disclosures |  |  |
Discount for lack of marketability ( as a percent) | 11.90% |  |
Share-based compensation expense | $ 0.5 | $ 0.7 |
Unrecognized share-based compensation expense | $ 2.2 |  | $ 1.3
Weighted-average period over which the remaining compensation expense is expected to be recognized | 1 year 6 months |  |
Minimum statutory withholding requirement paid on behalf of employees (in shares) | 40,000 | 38,000 |
Performance-based RSUs | Maximum |  |  |
Share-based compensation, additional disclosures |  |  |
Potential compensation expense | $ 4.0 |  |
2012 Stock Incentive Plan | RSUs |  |  |
Number of Shares |  |  |
Units outstanding at the beginning of the period (in shares) | 728,000 |  |
Granted (in shares) | 203,000 |  |
Forfeited (in shares) | 0 |  |
Issued (in shares) | (138,000) |  |
Units outstanding at the end of the period (in shares) | 793,000 |  |
Weighted Average Grant Date Fair Value |  |  |
Units outstanding at the beginning of the period (in dollars per share) | $ 11.56 |  |
Granted (in dollars per share) | 11.30 |  |
Forfeited (in dollars per share) | 0.00 |  |
Issued (in dollars per share) | 12.53 |  |
Units outstanding at the end of the period (in dollars per share) | $ 11.32 |  |
Share-based compensation, additional disclosures |  |  |
Vesting period upon achievement of annual nets sales growth targets (in years) | 1 year |  |
Vesting period upon achievement of earnings-per-share target (in years) | 1 year |  |
2012 Stock Incentive Plan | RSUs | Minimum |  |  |
Share-based compensation, additional disclosures |  |  |
Vesting period | 12 months |  |
2012 Stock Incentive Plan | RSUs | Maximum |  |  |
Share-based compensation, additional disclosures |  |  |
Vesting period | 48 months |  |
2012 Stock Incentive Plan | RSUs | Board of Directors |  |  |
Share-based compensation, additional disclosures |  |  |
Restriction period | 2 years |  |
Number of shares subject to restriction period | 95,000 |  | 96,000
2012 Stock Incentive Plan | Time-based RSUs |  |  |
Share-based compensation, additional disclosures |  |  |
Vesting period | 3 years |  |
Weighted-average grant date fair value (in dollars per share) | $ 11.36 |  |
2012 Stock Incentive Plan | Performance-based RSUs |  |  |
Share-based compensation, additional disclosures |  |  |
Weighted-average grant date fair value (in dollars per share) | $ 11.20 |  |
Net Sales and Operating Income Targets | 2012 Stock Incentive Plan | Performance-based RSUs |  |  |
Share-based compensation, additional disclosures |  |  |
Vesting period | 3 years |  |

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