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Common Shareholders' Equity (Narrative) (Details)
1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended 21 Months Ended
Sep. 30, 2014
$ / shares
Jun. 30, 2014
$ / shares
Mar. 31, 2014
$ / shares
Dec. 31, 2011
plan
Feb. 28, 2003
shares
Sep. 30, 2015
USD ($)
$ / shares
shares
Jun. 30, 2015
$ / shares
Jun. 30, 2015
$ / shares
Sep. 30, 2015
USD ($)
$ / shares
shares
Sep. 30, 2014
USD ($)
$ / shares
Sep. 30, 2013
USD ($)
$ / shares
Sep. 30, 2013
USD ($)
$ / shares
shares
Sep. 16, 2015
USD ($)
Dec. 20, 2011
USD ($)
Feb. 28, 2007
shares
Apr. 01, 2002
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Number of voting rights per share, common stock | $ / shares                 $ 1              
Common stock dividends declared, per share | $ / shares $ 0.10 $ 0.10       $ 0.10                  
Cash dividend                 $ 7,795,000 $ 9,875,000 $ 9,820,000          
Dividends Payable                         $ 0.02      
Repurchase of common stock authorized by Board of Directors                           $ 25,000,000    
Purchased shares | shares                 852,318     1,677,570        
Average price per share | $ / shares                 $ 7.73     $ 9.09        
Aggregate cost of treasury stock repurchased during the period                 $ 6,600,000     $ 15,300,000        
Number of repurchase plan replaced by existing plan | plan       2                        
Common Stock [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Cash dividend                 $ 7,300,000              
Two Thousand Two Plan [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Issuance of options to purchase shares of common stock | shares                               700,000
Number of additional shares authorized for issuance under an established share-based compensation plan | shares         100,000                      
Vesting period                 4 years              
Expiration date of options granted                 10 years              
Two Thousand Three Plan [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Issuance of options to purchase shares of common stock | shares                             5,300,000  
Common stock reserved for issuance | shares           2,700,000     2,700,000              
Available for future grant | shares           1,500,000     1,500,000              
Termination Due to Death [Member] | Two Thousand Two Plan [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Termination of the participant reason of death                 1 year              
Termination for reasons other than death, disability, cause, material breach or unsatisfactory performance [Member] | Two Thousand Two Plan [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Termination of the participant reason other than death                 30 days              
Restricted Stock [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Unrecognized stock compensation expense related to restricted stock awards           $ 2,700,000     $ 2,700,000              
Recognized weighted average period                 1 year 8 months              
Awarded, Weighted Average Grant Date Fair Value per Share | $ / shares                     $ 10.78          
Fair Value Assumptions, Weighted Average Expected Dividend | $ / shares                     0.10          
Restricted Stock [Member] | Termination for reasons other than death, disability, cause, material breach or unsatisfactory performance [Member] | Two Thousand Three Plan [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Vesting period                 1 year              
Restricted Stock Units (RSUs) [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Unrecognized stock compensation expense related to restricted stock awards           $ 6,200,000     $ 6,200,000              
Recognized weighted average period                 2 years 1 month              
Awarded, Weighted Average Grant Date Fair Value per Share | $ / shares                 $ 4.49 $ 10.05 9.60          
Fair Value Assumptions, Weighted Average Expected Dividend | $ / shares           $ 0.02   $ 0.10   $ 0.10 $ 0.10          
Restricted Stock Units (RSUs) [Member] | Termination for reasons other than death, disability, cause, material breach or unsatisfactory performance [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Vesting period                 1 year              
Minimum [Member] | Restricted Stock [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Vesting period                 4 years              
Minimum [Member] | Restricted Stock Units (RSUs) [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Vesting period                 4 years              
Maximum [Member] | Restricted Stock [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Vesting period                 5 years              
Maximum [Member] | Restricted Stock Units (RSUs) [Member]                                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                
Vesting period                 5 years