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BORROWINGS (Details)
1 Months Ended 12 Months Ended
Jan. 01, 2017
USD ($)
Dec. 31, 2014
USD ($)
Oct. 24, 2014
USD ($)
Nov. 30, 2015
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Debt Instrument [Line Items]              
Letters of credit, outstanding amount         $ 430,000    
Long-term debt, net         44,179,000 $ 8,843,000  
Proceeds from finance obligations         11,399,000 5,698,000 $ 0
Master Lease Agreement | U.S. Bank Equipment Finance              
Debt Instrument [Line Items]              
Debt term       60 months      
Long-term debt, net         15,087,000    
Proceeds from finance obligations         11,400,000    
Termination Period       12 months      
Weighted Average Interest Rate       3.60%      
Maximum Financing Amount       $ 20,000,000      
Commercial purchasing card              
Debt Instrument [Line Items]              
Outstanding balance         811,000 641,000  
Unused borrowing capacity         4,200,000 $ 4,400,000  
Loan Agreement              
Debt Instrument [Line Items]              
Debt instrument, face amount     $ 55,800,000        
Fixed charge coverage ratio, term   12 months          
Fixed charge coverage ratio   1.15          
Cash flow leverage ratio, term   12 months          
Minimum liquidity   $ 50,000,000          
Debt instrument, increase to borrowing capacity         20,000,000    
Long-term debt, net         $ 45,760,000    
Loan Agreement | During construction phase              
Debt Instrument [Line Items]              
Cash flow leverage ratio   3.00          
Loan Agreement | Following construction phase              
Debt Instrument [Line Items]              
Cash flow leverage ratio   2.50          
Loan Agreement | Default rate              
Debt Instrument [Line Items]              
Interest rate margin on variable rate basis (as a percent)         2.00%    
Loan Agreement | Revolving credit facility              
Debt Instrument [Line Items]              
Debt instrument, face amount     $ 10,000,000        
Debt term     3 years        
Loan Agreement | Revolving credit facility | LIBOR              
Debt Instrument [Line Items]              
Interest rate margin on variable rate basis (as a percent)     2.00%        
Loan Agreement | Revolving credit facility | Alternate Base Rate              
Debt Instrument [Line Items]              
Interest rate margin on variable rate basis (as a percent)     1.00%        
Loan Agreement | Senior secured real estate loan              
Debt Instrument [Line Items]              
Debt instrument, face amount     $ 45,800,000        
Loan Agreement | Real estate loan and term loan              
Debt Instrument [Line Items]              
Fixed rate following interest rate swap     4.60%        
Annual principal payment         $ 1,100,000    
Periodic payment terms, balloon payment         $ 38,000,000    
Loan Agreement | Real estate loan and term loan | LIBOR              
Debt Instrument [Line Items]              
Interest rate margin on variable rate basis (as a percent)     2.00%        
Loan Agreement | Real estate loan and term loan | Alternate Base Rate              
Debt Instrument [Line Items]              
Interest rate margin on variable rate basis (as a percent)     1.00%        
Subsequent event | Loan Agreement | Term loan              
Debt Instrument [Line Items]              
Debt term 6 years 9 months            
Long-term Debt, Gross $ 45,800,000