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Incentive Plan (Narrative) (Details) - USD ($)
$ in Millions
May. 02, 2007
Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Maximum number of shares granted per employee 1,500,000  
Maximum amount of cash paid per employee $ 10.0  
2004 Incentive Award Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares authorized and reserved for issuance under the "Incentive Plan"   4,474,102
Amended And Restated 2004 Incentive Award Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares authorized and reserved for issuance under the "Incentive Plan" 9,474,102  
Increase in number of shares reserved for issuance 5,000,000  
2014 Incentive Award Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares remaining for issuance under the "Incentive Plan"   4,775,319