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Stock-Based Compensation - Performance Share Units Settled (Details) - Performance share units
6 Months Ended
Jun. 30, 2017
shares
Jun. 30, 2016
shares
2014    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Net Number of Issued Shares upon Vesting 6,476 11,487
Shares Withheld to Settle Tax Withholding Obligations 3,573 0
2014 | Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
TSR Multiple Range 0.75 0.63
Russell 3000 Multiple 0 0
2014 | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
TSR Multiple Range 1.00 0.63
Russell 3000 Multiple 0 0
2015    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Net Number of Issued Shares upon Vesting 3,869 13,529
Shares Withheld to Settle Tax Withholding Obligations 2,310 0
2015 | Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
TSR Multiple Range 0.60 0.5
Russell 3000 Multiple 0 0
2015 | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
TSR Multiple Range 0.60 0.5
Russell 3000 Multiple 0 0
2013    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Net Number of Issued Shares upon Vesting   28,566
Shares Withheld to Settle Tax Withholding Obligations   1,572
2013 | Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
TSR Multiple Range   0.63
Russell 3000 Multiple   0
2013 | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
TSR Multiple Range   1
Russell 3000 Multiple   0