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Debt (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Dec. 21, 2016
Mar. 31, 2016
Mar. 16, 2015
Debt            
Maximum borrowing capacity       $ 50,000   $ 40,000
Purchase price of a commercial building $ 1,920          
Fixed interest rate 4.35%          
Amortization schedule 25 years          
Balloon payment 10 years          
Net discount on debt and deferred financing fees     $ (92)      
Long-term Debt, Total $ 19,972   27,381      
Less current maturities of long-term debt (44)   (2,223)      
Long-term debt 19,928   25,158      
Long-term Debt, Fiscal Year Maturity [Abstract]            
Remainder of 2017 15          
2018 44          
2019 18,105          
2020 48          
2021 50          
Thereafter 1,710          
Debt issuance costs   $ 248        
Loss on debt extinguishment   $ (993)        
Revolving credit facility            
Debt            
Maximum borrowing capacity       45,000    
Aggregate principal amount 25,000         7,000
Outstanding balance $ 18,059   $ 22,473      
Variable interest rate, basis points spread over variable reference rate (as a percent) 4.75%   4.25%      
Term loans            
Debt            
Maximum borrowing capacity       $ 5,000    
Aggregate principal amount         $ 48,000 $ 33,000
Outstanding balance     $ 5,000      
Variable interest rate, basis points spread over variable reference rate (as a percent)     4.25%      
Term B Loans            
Debt            
Aggregate principal amount     $ 3,000      
Term A Loans            
Debt            
Aggregate principal amount $ 20,000          
Mortgage            
Debt            
Mortgage $ 1,913