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Stock Incentive Plan - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
May. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Non-cash compensation expense   $ 0.9 $ 0.4 $ 0.2  
2010 Stock Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Maximum shares issuable (in shares)   1,190,000      
Common shares reserved for issuance (in shares)   551,609 862,512    
Director | 2010 Stock Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares issued (in shares)   146,935 111,311    
Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares outstanding, unvested restricted stock (in shares)   280,457 162,171 94,873 31,580
Performance shares, grants in period (in shares)   185,650 104,517 75,385  
Restricted Stock | 2010 Stock Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares outstanding, unvested restricted stock (in shares)   280,457 162,171    
Forfeitures (in shares)   0 0 0  
Unrecognized compensation expense   $ 1.3 $ 0.8    
Weighted average period to recognize the unrecognized compensation expense   1 year 328 days      
Fair value of shares vested   $ 0.5 $ 0.3 $ 0.1  
Requisite service period   3 years      
Employee Stock Option | 2010 Stock Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares issued (in shares)   401,827 216,177    
Performance Shares | 2010 Stock Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Non-cash compensation expense   $ 0.1      
Unrecognized compensation expense   $ 0.3      
Performance Shares | Board of Directors Chairman | 2010 Stock Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Performance shares, grants in period (in shares) 89,629        
Performance shares, grants in period $ 0.4        
Performance shares, vested shares as a percentage of target number of awards granted, lower range (as a percent) 0.00%        
Performance shares, vested shares as a percentage of target number of awards granted, upper range (as a percent) 200.00%        
Award vesting period 3 years        
Award vesting threshold (as a percent) 0.33        
Fair value assumptions, expected term 3 years        
Fair value assumptions, expected term for expected volatility rate 3 years        
Fair value assumptions, expected term for risk-free interest rate 3 years        
Fair value assumptions, expected term for expected dividend rate 3 years        
If TSR Is Less Than 33% | Performance Shares | Board of Directors Chairman | 2010 Stock Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting rights (as a percent) 0.00%        
If TSR Is Greater Than Or Equal To 33% | Performance Shares | Board of Directors Chairman | 2010 Stock Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting rights (as a percent) 100.00%        
If TSR Is Greater Than Or Equal To 33% And TSR Is In Top Quartile Of Identified Peer Group | Performance Shares | Board of Directors Chairman | 2010 Stock Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting rights (as a percent) 200.00%        
If TSR Is Greater Than Or Equal To 33% And TSR Is In Bottom Quartile Of Identified Peer Group | Performance Shares | Board of Directors Chairman | 2010 Stock Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting rights (as a percent) 50.00%