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Share-Based Compensation - Restricted Stock Units (Details)
$ in Millions
1 Months Ended 12 Months Ended
Nov. 30, 2014
shares
Dec. 31, 2016
USD ($)
company
shares
Dec. 31, 2015
shares
Number of Shares      
Outstanding at beginning of year (in shares)   214,158  
Granted (in shares)   0  
Canceled/forfeited (in shares)   (47,182)  
Vested/Paid (in shares)   (120,068)  
Outstanding at end of year (in shares)   46,908 214,158
Market Based Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Evaluation period (in days)   20 days  
Number of peer group companies | company   12  
Earned at end of performance period, percent     50.00%
Number of Shares      
Outstanding at beginning of year (in shares)   25,821  
Granted (in shares) 60,767 0  
Canceled/forfeited (in shares)   (2,285)  
Vested/Paid (in shares)   (8,607)  
Outstanding at end of year (in shares)   14,929 25,821
Cash settled stock units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period   3 years  
Total value of stock that vested | $   $ 0.3  
Number of Shares      
Outstanding at beginning of year (in shares)   188,337  
Granted (in shares)   0  
Canceled/forfeited (in shares)   (44,897)  
Vested/Paid (in shares)   (111,461)  
Outstanding at end of year (in shares)   31,979 188,337
Restricted Stock Units (RSUs) and Market Based Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Liability for RSUs outstanding and expected to vest   100,000  
Minimum | Market Based Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Earning percentage   0.00%  
Maximum | Market Based Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Earning percentage   200.00%