Quarterly report pursuant to Section 13 or 15(d)

Capital Transactions - Incentive Plans and Stock Options Narrative (Details)

v3.19.1
Capital Transactions - Incentive Plans and Stock Options Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended
Jan. 31, 2015
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options to purchase (in shares)   1,110,000   1,114,000  
Granted (in shares)   0      
Exercised (in shares)   0      
Exercised (in dollars per share)   $ 0.00      
Stock options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options to purchase (in shares)   1,110,000   1,114,000  
Aggregate Intrinsic value, outstanding   $ 300,000   $ 200,000  
Granted (in shares)   0      
Exercised (in shares)     30,000    
Exercised (in dollars per share)     $ 5.88    
Aggregate intrinsic values of options exercised     $ 200,000    
Tax benefit from the exercise of stock options     32,000    
Time-based stock options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation expense   $ 0 $ 13,000    
Unrecognized share-based compensation expense   $ 0   $ 0  
Time-based stock options | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period   48 months      
Performance based stock options operating income margins          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Operating income margin, one (as a percent)   6.00%      
Operating income margin, two (as a percent)   8.00%      
Operating income margin, three (as a percent)   10.00%      
Performance based stock options operating income margins | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award performance period   1 year      
Performance based stock options operating income margins | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award performance period   1 year 3 months      
Performance Shares          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unvested options outstanding (in shares)   0   0  
2012 Stock Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares authorized under the plan (in shares)         1,500,000
Additional number of shares authorized under the plan (in shares) 1,500,000        
2009 Incentive Plan | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares authorized under the plan (in shares)   400,000