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Stock-Based Compensation - Performance Share Units Settled (Details) - Performance share units
9 Months Ended
Sep. 30, 2015
shares
2013  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Issued Shares upon Vesting 8,768
Shares Withheld to Settle Tax Withholding Obligations 3,954
2013 | Minimum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
TSR Multiple Range 1.75
Russell 3000 Multiple 2.00
2013 | Maximum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
TSR Multiple Range 1.75
Russell 3000 Multiple 2.00
2014  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Issued Shares upon Vesting 2,506
Shares Withheld to Settle Tax Withholding Obligations 1,145
2014 | Minimum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
TSR Multiple Range 0.63
Russell 3000 Multiple 0
2014 | Maximum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
TSR Multiple Range 0.75
Russell 3000 Multiple 0.75