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Share-Based Payment Arrangements (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended 24 Months Ended
Jul. 22, 2016
Apr. 01, 2016
Mar. 31, 2016
May 29, 2015
Apr. 10, 2013
Jul. 27, 2012
Sep. 30, 2016
Sep. 30, 2015
Jun. 30, 2013
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Other than options, granted   7,144                          
Stock options, granted                            
Long Term Incentive Plan 2005 [Member]                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Number of incentive stock options to purchase shares of common stock outstanding                   447,574          
Number of non-qualified stock options to purchase shares of common stock outstanding                   289,157          
Number of restricted stock units to receive shares of common stock                   156,404          
Long Term Incentive Plan 2005 [Member] | Option Issued Prior to 2009 [Member] | Share-based Compensation Award, Tranche One [Member]                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Percentage of options vested or expected to vest             10.00%     10.00%          
Long Term Incentive Plan 2005 [Member] | Option Issued Prior to 2009 [Member] | Share-based Compensation Award, Tranche Two [Member]                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Percentage of options vested or expected to vest             20.00%     20.00%          
Long Term Incentive Plan 2005 [Member] | Option Issued Prior to 2009 [Member] | Share-based Compensation Award, Tranche Three [Member]                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Percentage of options vested or expected to vest             30.00%     30.00%          
Long Term Incentive Plan 2005 [Member] | Option Issued Prior to 2009 [Member] | Share-based Compensation Award, Tranche Four [Member]                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Percentage of options vested or expected to vest             40.00%     40.00%          
Long Term Incentive Plan 2005 [Member] | Minimum [Member] | Option Issued Prior to 2009 [Member]                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Incentive stock options termination period                   5 years          
Long Term Incentive Plan 2005 [Member] | Maximum [Member] | Option Issued Prior to 2009 [Member]                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Incentive stock options termination period                   10 years          
Long Term Incentive Plan 2015 [Member]                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Stock compensation plan, number of shares authorized             2,000,000     2,000,000          
Number of restricted stock units to receive shares of common stock                   319,572          
Stock options, granted                   0          
Long Term Incentive Plan 2005 and 2015 [Member]                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Total unrecognized compensation cost related to non-vested share-based compensation arrangements             $ 0     $ 0          
Incentive Stock Options 2009 [Member]                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Incentive stock options termination period                   7 years          
Share-based payment, award vesting period                   10 years          
Incentive Stock Options 2010 [Member] | 25,000 [Member]                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Incentive stock options termination period                   10 years          
Share-based payment, award vesting period                   3 years          
Number of options vested or expected to vest             25,000     25,000          
Non Qualified Stock Options [Member] | Long Term Incentive Plan 2005 [Member]                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Percentage of options vested or expected to vest             100.00%     100.00%          
Incentive stock options termination period                   10 years          
Share-based payment, award vesting period                   6 months          
Incentive Non Qualified Stock Options 2009 [Member] | 200,000 Grant [Member]                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Incentive stock options termination period                   10 years          
Share-based payment, award vesting period                   7 years          
Number of options vested or expected to vest             200,000     200,000          
Restricted Stock Units (RSUs) [Member]                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Restricted stock or unit expense                     $ 408        
Restricted stock expense, benefit portion             $ 249 $ 49   $ 59          
Other than options, granted                   122,770          
Other than options, forfeited                   94,880          
Vested                   7,144          
Other than options, grant date fair value                   $ 11.41          
Income tax benefit of share-based payments recognized in income                     $ 143        
Income tax expense of share-based payments recognized in income             $ 88 $ 17   $ 21          
Restricted Stock Units (RSUs) [Member] | Minimum [Member]                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Percentage of restricted stock units granted as result of meeting growth rates             50.00%     50.00%          
Restricted Stock Units (RSUs) [Member] | Maximum [Member]                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Percentage of restricted stock units granted as result of meeting growth rates             150.00%     150.00%          
Restricted Stock Units (RSUs) [Member] | Long Term Incentive Plan 2005 [Member]                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Other than options, granted         122,823 129,463           175,983      
Other than options, forfeited                 9,280            
Vested     7,144                        
Other than options, grant date fair value                         $ 11.10 $ 9.66 $ 9.20
Restricted Stock Units (RSUs) [Member] | Long Term Incentive Plan 2015 [Member]                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Other than options, granted 122,770     103,351                      
Restricted Stock Units (RSUs) [Member] | Long Term Incentive Plan 2005 and 2015 [Member]                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Total unrecognized compensation cost related to non-vested share-based compensation arrangements             $ 1,400     $ 1,400          
Compensation costs expected to be recognized during remainder of the fiscal period             200     200          
Compensation costs expected to be recognized during next fiscal year             600     600          
Compensation costs expected to be recognized in second future fiscal year             500     500          
Compensation costs expected to be recognized in third future fiscal year             $ 100     $ 100