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Incentive Plans Incentive Plans: Narrative (Details)
3 Months Ended 12 Months Ended
Jun. 30, 2014
USD ($)
shares
Jun. 30, 2015
USD ($)
plan
$ / shares
shares
Jun. 30, 2014
USD ($)
$ / shares
shares
Jun. 30, 2013
USD ($)
$ / shares
shares
Dec. 31, 2013
shares
Dec. 31, 2010
shares
Dec. 31, 2006
shares
Dec. 31, 2003
shares
Dec. 31, 1996
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of share-based compensation plans | plan   4              
Share-based compensation expense | $   $ 1,500,000 $ 500,000 $ 768,000          
Income tax benefit recognized for share-based compensation plans | $   $ (397,000) $ 315,000 $ 92,000          
Treasury stock, Shares used to fund Equity Incentive Plans for restricted stock 8,402,096 9,132,258 8,402,096            
2013 Equity Incentive Plan [Member] | Stock Options                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of shares authorized for Equity Incentive Plan         300,000        
Annual limitation on awards granted to an individual under Equity Incentive Plan   60,000              
2013 Equity Incentive Plan [Member] | Restricted Stock                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of shares authorized for Equity Incentive Plan         300,000        
Annual limitation on awards granted to an individual under Equity Incentive Plan   45,000              
Equity Incentive Plans                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Stock options granted, weighted average grant date fair value | $ / shares   $ 14.59 $ 15.14 $ 16.47          
Stock options, Exercised   52,500 52,500 42,000          
Stock options, Granted   369,000 20,000 20,000          
Stock options, Forfeitured   3,000 31,300 24,000          
Unrecognized share-based compensation expense, stock options | $ $ 400,000 $ 2,100,000 $ 400,000            
Equity Incentive Plans | Stock Options                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Stock options granted, weighted average grant date fair value | $ / shares   $ 6.06 $ 6.80 $ 8.35          
Term used to calculate expected volatility   84 months              
Stock options, Exercised 42,000 52,500 52,500            
Stock options, Granted   369,000 20,000 20,000          
Stock options, Forfeitured   3,000 31,300            
Number of shares available for grant 499,750 133,750 499,750            
Share-based compensation cost not yet recognized, weighted average period for recognition (less than)   3 years 2 months 1 year            
Forfeiture rate for Equity Incentive Plans   20.00% 20.00%            
Equity Incentive Plans | Stock Options | Maximum                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Award vesting period   5 years              
Maximum term for stock awards   10 years              
Equity Incentive Plans | Stock Options | Award Vesting Term 1                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Award vesting period   2 years              
Restricted stock, award vesting percentage   50.00%              
Equity Incentive Plans | Stock Options | Award Vesting Term 2                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Award vesting period   4 years              
Restricted stock, award vesting percentage   50.00%              
Equity Incentive Plans | Restricted Stock                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period     15,000 0          
Number of shares available for grant 460,350 276,850 460,350            
Share-based compensation cost not yet recognized, weighted average period for recognition (less than)   3 years 2 months 20 days 2 years 1 month            
Forfeiture rate for Equity Incentive Plans   20.00% 20.00%            
Restricted stock, Vesting and distribution   65,000 0 73,050          
Restricted stock, Forfeited   1,500 5,750 1,500          
Restricted stock, grants in period   185,000 15,000 0          
Unrecognized share-based compensation expense, restricted stock | $ $ 472,000 $ 2,200,000 $ 472,000            
Restricted stock, Fair value of shares vested and distributed | $   $ 1,100,000 $ 0 $ 1,100,000          
Equity Incentive Plans | Restricted Stock | Maximum                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Award vesting period   5 years              
Equity Incentive Plans | Restricted Stock | Award Vesting Term 1                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Award vesting period       2 years          
Restricted stock, award vesting percentage       50.00%          
Equity Incentive Plans | Restricted Stock | Award Vesting Term 2                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Award vesting period       4 years          
Restricted stock, award vesting percentage       50.00%          
2010 Equity Incentive Plan | Stock Options                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of shares authorized for Equity Incentive Plan           586,250      
Annual limitation on awards granted to an individual under Equity Incentive Plan   117,250              
2010 Equity Incentive Plan | Restricted Stock                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of shares authorized for Equity Incentive Plan           288,750      
Annual limitation on awards granted to an individual under Equity Incentive Plan   43,312              
Treasury stock, Shares used to fund Equity Incentive Plans for restricted stock         300,000 288,750      
2006 Equity Incentive Plan | Stock Options                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of shares authorized for Equity Incentive Plan             365,000    
Annual limitation on awards granted to an individual under Equity Incentive Plan   73,000              
2006 Equity Incentive Plan | Restricted Stock                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of shares authorized for Equity Incentive Plan             185,000    
Annual limitation on awards granted to an individual under Equity Incentive Plan   27,750              
Treasury stock, Shares used to fund Equity Incentive Plans for restricted stock             185,000    
Stock Option Plans                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Stock options granted, weighted average grant date fair value | $ / shares   $ 0.00 $ 0.00 $ 0.00          
Stock options, Exercised   0 0 0          
Stock options, Granted   0 0 0          
Stock options, Forfeitured   25,000 317,700 7,500          
Unrecognized share-based compensation expense, stock options | $   $ 0              
Stock Option Plans | Stock Options                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Term used to calculate expected volatility   84 months              
Stock options, Forfeitured   25,000 317,700 7,500          
Stock Option Plans | Stock Options | Maximum                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Award vesting period   5 years              
Maximum term for stock awards   10 years              
2003 Stock Option Plan | Stock Options                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of shares authorized for Equity Incentive Plan               352,500  
1996 Stock Option Plan | Stock Options                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of shares authorized for Equity Incentive Plan                 1,150,000.00