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Stock Compensation - Narrative (Details)
1 Months Ended 5 Months Ended 12 Months Ended
Jan. 31, 2014
USD ($)
day
director
condition
$ / shares
shares
Feb. 28, 2014
shares
Dec. 31, 2015
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock -based compensation expense       $ 2,617,000 $ 3,684,000
Number of independent directors | director 3        
Stock options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period       3 years  
Unrecognized compensation costs for options       $ 1,055,000  
Period for compensation recognition       2 years  
Stock appreciation rights (SAR)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period       3 years  
Period for compensation recognition       1 year 8 months 12 days  
Unrecognized compensation cost for shares       $ 29,000  
Shares transferred (in shares) | shares       9,350 0
Outstanding shares (in shares) | shares     165,000 75,625 158,125
Restricted stock units (RSU)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock -based compensation expense       $ 0  
Vesting period       3 years  
Period for compensation recognition       2 years 2 months 12 days  
Unrecognized compensation cost for shares       $ 3,130,000  
Compensation that may be conditionally recognized       1,000,000  
Phantom stock options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock -based compensation expense       $ 0  
Vesting period       3 years  
Period for compensation recognition       2 years 2 months 12 days  
Unrecognized compensation cost for shares       $ 400,000  
Compensation that may be conditionally recognized       $ 300,000  
Director shares          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Period for compensation recognition       1 year  
Unrecognized compensation cost for shares       $ 2,000  
Shares transferred (in shares) | shares 20,125        
Number shares transferred, as adjusted for the effect of dividends (in shares) | shares   60,375      
Number of shares held by each director (in shares) | shares       18,375  
Outstanding shares (in shares) | shares       55,125  
Number to performance conditions | condition 2        
Period within which business combination is to be completed from IPO 21 months        
Percentage of forfeitable shares under certain conditions 25.00%        
Forfeitable shares under certain conditions (in shares) | shares 13,781        
Minimum stock trading price (in dollars per share) | $ / shares $ 13        
Number of days of trading period of the minimum trading price | day 20        
Period of trading period of the minimum stock trading price 30 days        
Period of forfeiture condition 5 years        
Aggregate fair value $ 400,000        
2015 Incentive Compensation Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Authorized to grant (in shares) | shares       5,150,000  
Available for grant (in shares) | shares       3,339,356  
Stock -based compensation expense       $ 2,600,000 $ 3,700,000
Anniversary one | Stock options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting rate       33.00%  
Anniversary two | Stock options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting rate       33.00%  
Anniversary three | Stock options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting rate       33.00%  
Director | Restricted stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     3 years 1 year 1 year
Period for compensation recognition       1 year 6 months  
Unrecognized compensation cost for shares       $ 200,000  
Director | Anniversary one | Restricted stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting rate     33.00%    
Director | Anniversary two | Restricted stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting rate     33.00%    
Director | Anniversary three | Restricted stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting rate     33.00%