Quarterly report pursuant to Section 13 or 15(d)

Capital Transactions - Additional Information (Details)

v3.8.0.1
Capital Transactions - Additional Information (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 07, 2017
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2015
Dec. 31, 2016
Nov. 30, 2014
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Dividends declared per common share (in dollars per share) $ 0.10 $ 0 $ 0.10 $ 0.10 $ 0.3        
Cash dividends declared $ 1,800,000     $ 1,848,000          
Weighted Average Exercise Price Per Share                  
Granted (in dollars per share)       $ 13.50          
Stock options                  
Number of shares                  
Options outstanding at the beginning of the period (in shares)       1,524,000          
Granted (in shares)       25,000          
Forfeited or canceled (in shares)       (54,000)          
Exercised (in shares)       (9,000) (32,000)        
Options outstanding at the end of the period (in shares)   1,486,000   1,486,000          
Weighted Average Exercise Price Per Share                  
Options outstanding at the beginning of the period (in dollars per share)       $ 12.41          
Forfeited or canceled (in dollars per share)       14.27          
Exercised (in dollars per share)       11.98 $ 3.99        
Options outstanding at the end of the period (in dollars per share)   $ 12.27   $ 12.27          
Expected to vest (in shares)   102,000   102,000     306,000    
Exercisable (in shares)   1,385,000   1,385,000     1,201,000    
Aggregate Intrinsic value, outstanding   $ 900,000   $ 900,000     $ 4,200,000    
Aggregate Intrinsic value, exercisable   900,000   900,000     3,700,000    
Aggregate intrinsic values of options exercised       7,000 $ 200,000        
Aggregate Intrinsic value, expected to vest   0   0     386,000    
Tax benefit from the exercise of stock options       0 100,000        
Time-based stock options                  
Weighted Average Exercise Price Per Share                  
Share-based compensation expense   (200,000) $ 200,000 200,000 600,000        
Unrecognized share-based compensation expense   $ 100,000   $ 100,000     $ 300,000    
Weighted-average period over which the remaining compensation cost is expected to be recognized       5 months          
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 sales                  
Weighted Average Exercise Price Per Share                  
Share-based compensation expense       $ 0 $ 0        
2012 Stock Incentive Plan                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of shares authorized under the plan                 1,500,000
Additional number of shares authorized under the plan           1,500,000      
Number of shares                  
Granted (in shares)       25,000          
Weighted Average Exercise Price Per Share                  
Exercised (in dollars per share)       $ 13.50          
Share-based compensation, additional disclosures                  
Weighted-average grant date fair value (in dollars per share)       $ 4.94          
Expected contractual life (in years)       5 years          
Risk-free interest rate (as a percent)       1.80%          
Expected volatility (as a percent)       39.80%          
Modification Plan                  
Weighted Average Exercise Price Per Share                  
Expected to vest (in shares)   131,000   131,000          
Exercisable options, additional term       1 year          
Incremental compensation expense       $ 100,000          
2009 Incentive Plan | Maximum                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of shares authorized under the plan   400,000   400,000          
2014 Share Repurchase Program                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Stock repurchase program, authorized amount               $ 20,000,000  
Remaining balance available for repurchases   $ 13,400,000   $ 13,400,000          
Repurchase of common stock (in shares)   0 0 0 0