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Stock-Based Compensation Stock-Based Compensation - PSUs Settled (Details) - Performance share units
12 Months Ended
Dec. 31, 2016
shares
Dec. 31, 2015
shares
2013    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Net Number of Issued Shares upon Vesting (in shares) 38,706 8,768
Shares Withheld to Settle Tax Withholding Obligations (in shares) 1,572 3,954
2013 | Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
TSR Multiple Range 0.63 1.75
Russell 3000 Multiple 0 2
2013 | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
TSR Multiple Range 1.00 1.75
Russell 3000 Multiple 0 2
2014    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Net Number of Issued Shares upon Vesting (in shares) 11,487 2,506
Shares Withheld to Settle Tax Withholding Obligations (in shares) 0 1,145
2014 | Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
TSR Multiple Range 0.63 0.63
Russell 3000 Multiple 0 0
2014 | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
TSR Multiple Range 0.63 0.75
Russell 3000 Multiple 0 0.75
2015    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Net Number of Issued Shares upon Vesting (in shares) 13,529  
Shares Withheld to Settle Tax Withholding Obligations (in shares) 0  
2015 | Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
TSR Multiple Range 0.50  
Russell 3000 Multiple 0  
2015 | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
TSR Multiple Range 0.50  
Russell 3000 Multiple 0