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Stock Compensation (Details)
1 Months Ended 5 Months Ended 12 Months Ended
Jan. 31, 2014
USD ($)
item
director
condition
$ / shares
shares
Feb. 28, 2014
shares
Dec. 31, 2015
shares
Dec. 31, 2016
USD ($)
shares
Dec. 31, 2015
USD ($)
shares
Jul. 31, 2015
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock -based compensation expense       $ 3,684,000 $ 1,124,000  
Number of independent directors | director 3          
Stock options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized compensation costs for options       $ 1,300,000    
Period for compensation recognition       1 year 4 months 24 days    
Stock appreciation rights (SAR)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Period for compensation recognition       1 year 3 months 18 days    
Unrecognized compensation cost for shares       $ 29,000    
Shares transferred (in shares) | shares     165,000 0    
Outstanding shares (in shares) | shares     165,000 158,125 165,000 0
Restricted stock units (RSU)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Period for compensation recognition       1 year 9 months 18 days    
Vesting period       3 years    
Unrecognized compensation cost for shares       $ 900,000    
Compensation that may be conditionally recognized       $ 1,000,000    
Phantom stock options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Period for compensation recognition       1 year 8 months 12 days    
Vesting period     3 years      
Unrecognized compensation cost for shares       $ 24,000    
Compensation that may be conditionally recognized       300,000    
Director shares            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock -based compensation expense       $ 0    
Period for compensation recognition       1 year 1 month 6 days    
Unrecognized compensation cost for shares       $ 29,000    
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 | item 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       2,750,000    
Available for grant (in shares) | shares       1,200,047    
Stock -based compensation expense       $ 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%    
Chief Executive Officer | Stock options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period       3 years    
Chief Executive Officer | Anniversary one | Stock options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting rate       33.00%    
Chief Executive Officer | Anniversary two | Stock options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Monthly vesting rate, percentage       2.75%    
Chief Executive Officer | Anniversary three | Stock options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Monthly vesting rate, percentage       2.75%    
Director | Restricted stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Period for compensation recognition       1 year 6 months    
Vesting period     3 years      
Unrecognized compensation cost for shares       $ 81,000    
Awarded August to December 2015 | Director | Anniversary one | Restricted stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting rate     33.00%      
Awarded August to December 2015 | Director | Anniversary two | Restricted stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting rate     33.00%      
Awarded August to December 2015 | Director | Anniversary three | Restricted stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting rate     33.00%      
Awarded January to December 2016 | Director | Anniversary one | Restricted stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting rate       100.00%