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Borrowings - Additional Information (Details)
3 Months Ended 6 Months Ended
Nov. 21, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
Jun. 30, 2018
USD ($)
Jun. 30, 2017
Dec. 31, 2017
USD ($)
Feb. 23, 2015
USD ($)
Oct. 24, 2014
USD ($)
Credit Facilities [Line Items]                
Long-term debt, maturities, repayments of principal in next twelve months   $ 10,000,000   $ 10,000,000        
Structured payable   644,000   644,000   $ 709,000    
Current portion of long-term borrowings   10,318,000   10,318,000   10,318,000    
Long term borrowings   $ 57,326,000   $ 57,326,000   50,391,000    
Debt instrument, covenant, interest coverage ratio, minimum   3.5   3.5        
Debt instrument, covenant, leverage ratio, maximum   3.0   3.0        
Notes Payable, Other Payables                
Credit Facilities [Line Items]                
Current portion of long-term borrowings   $ 318,000   $ 318,000   318,000    
Long term borrowings   326,000   326,000   391,000    
Revolving Credit Facility                
Credit Facilities [Line Items]                
Outstanding debt   67,000,000   67,000,000   60,000,000    
Outstanding debt, current           10,000,000    
Outstanding debt, noncurrent   57,000,000   57,000,000   50,000,000    
Unamortized debt issuance costs   $ 694,000   $ 694,000   $ 773,000    
Revolving Credit Facility | Credit Facility                
Credit Facilities [Line Items]                
Maximum borrowing capacity               $ 50,000,000
Option to increase additional credit facility             $ 50,000,000  
Interest rate     2.70%   2.60%      
Revolving Credit Facility | New Credit Agreement                
Credit Facilities [Line Items]                
Maximum borrowing capacity $ 200,000,000              
Option to increase additional credit facility 100,000,000              
Interest rate   3.80%   3.60%        
Debt issuance costs $ 790,000              
Revolving Credit Facility | New Credit Agreement | Minimum                
Credit Facilities [Line Items]                
Commitment fee percentage range on unused credit facility 0.15%              
Revolving Credit Facility | New Credit Agreement | Maximum                
Credit Facilities [Line Items]                
Commitment fee percentage range on unused credit facility 0.30%              
Revolving Credit Facility | New Credit Agreement | Prime Rate | Minimum                
Credit Facilities [Line Items]                
Basis spread on variable rate 0.00%              
Revolving Credit Facility | New Credit Agreement | Prime Rate | Maximum                
Credit Facilities [Line Items]                
Basis spread on variable rate 0.75%              
Revolving Credit Facility | New Credit Agreement | London Interbank Offered Rate (LIBOR) | Minimum                
Credit Facilities [Line Items]                
Basis spread on variable rate 1.00%              
Revolving Credit Facility | New Credit Agreement | London Interbank Offered Rate (LIBOR) | Maximum                
Credit Facilities [Line Items]                
Basis spread on variable rate 1.75%