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Borrowings - Additional Information (Details)
Nov. 21, 2017
USD ($)
Sep. 30, 2018
USD ($)
Jul. 02, 2018
USD ($)
Dec. 31, 2017
USD ($)
Feb. 23, 2015
USD ($)
Oct. 24, 2014
USD ($)
Credit Facilities [Line Items]            
Debt instrument, covenant, interest coverage ratio, minimum   3.5        
Debt instrument, covenant, leverage ratio, maximum   3.0        
Long-term debt, maturities, repayments of principal in next twelve months   $ 12,000,000        
Structured payable   627,000   $ 709,000    
Current portion of long-term borrowings   12,318,000   10,318,000    
Long term borrowings   288,309,000   50,391,000    
Notes Payable, Other Payables            
Credit Facilities [Line Items]            
Current portion of long-term borrowings   318,000   318,000    
Long term borrowings   309,000   391,000    
Revolving Credit Facility            
Credit Facilities [Line Items]            
Outstanding debt   300,000,000   60,000,000    
Outstanding debt, current       10,000,000    
Outstanding debt, noncurrent   288,000,000   50,000,000    
Unamortized debt issuance costs   $ 1,364,000   $ 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  
Revolving Credit Facility | New Credit Agreement            
Credit Facilities [Line Items]            
Maximum borrowing capacity $ 200,000,000          
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%          
SCIO | Revolving Credit Facility | New Credit Agreement            
Credit Facilities [Line Items]            
Maximum borrowing capacity     $ 300,000,000      
SCIO | Revolving Credit Facility | New Credit Agreement | Maximum            
Credit Facilities [Line Items]            
Option to increase additional credit facility     $ 100,000,000