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Capital Transactions - Restricted Stock Units (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
RSUs |  |  |  |  |
Share-based compensation, additional disclosures |  |  |  |  |
Share-based compensation expense | $ 700,000 | $ 500,000 | $ 1,300,000 | $ 1,100,000 |
Unrecognized share-based compensation expense | 2,600,000 |  | $ 2,600,000 |  | $ 2,000,000
Weighted-average period over which the remaining compensation expense is expected to be recognized |  |  | 1 year 2 months |  |
Minimum statutory withholding requirement paid on behalf of employees (in shares) |  |  | 20,000 |  |
Performance-based RSUs |  |  |  |  |
Share-based compensation, additional disclosures |  |  |  |  |
Share-based compensation expense |  |  | $ 0 | $ 0 |
Performance-based RSUs | Maximum |  |  |  |  |
Share-based compensation, additional disclosures |  |  |  |  |
Potential compensation expense | $ 4,200,000 |  | $ 4,200,000 |  |
2012 Stock Incentive Plan |  |  |  |  |
Share-based compensation, additional disclosures |  |  |  |  |
Weighted-average grant date fair value (in dollars per share) |  |  | $ 4.94 |  |
2012 Stock Incentive Plan | RSUs |  |  |  |  |
Number of Shares |  |  |  |  |
Units outstanding at the beginning of the period (in shares) |  |  | 838,000 |  |
Granted (in shares) |  |  | 256,000 |  |
Issued (in shares) |  |  | (25,000) |  |
Forfeited (in shares) |  |  | (165,000) |  |
Units outstanding at the end of the period (in shares) | 904,000 |  | 904,000 |  |
Weighted Average Grant Date Fair Value |  |  |  |  |
Units outstanding at the beginning of the period (in dollars per share) |  |  | $ 11.39 |  |
Granted (in dollars per share) |  |  | 12.69 |  |
Issued (in dollars per share) |  |  | 12.37 |  |
Forfeited (in dollars per share) |  |  | 12.16 |  |
Units outstanding at the end of the period (in dollars per share) | $ 11.68 |  | $ 11.68 |  |
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 | 65,000 |  | 65,000 |  | 69,000
2012 Stock Incentive Plan | Performance-based RSUs |  |  |  |  |
Share-based compensation, additional disclosures |  |  |  |  |
Weighted-average grant date fair value (in dollars per share) |  |  | $ 13.35 |  |
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) |  |  | $ 12.69 |  |
2012 Stock Incentive Plan | Net Sales and Operating Income Targets | Performance-based RSUs |  |  |  |  |
Share-based compensation, additional disclosures |  |  |  |  |
Vesting period |  |  | 3 years |  |
2012 Stock Incentive Plan | Earnings Per Share Targets | Performance-based RSUs |  |  |  |  |
Share-based compensation, additional disclosures |  |  |  |  |
Vesting period |  |  | 6 years |  |

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