Quarterly report pursuant to Section 13 or 15(d)

Capital Transactions - Restricted Stock Units (Details)

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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