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Debt (Narrative) (Details)
1 Months Ended 3 Months Ended
Dec. 07, 2015
USD ($)
Jun. 30, 2014
USD ($)
Mar. 31, 2017
USD ($)
$ / shares
Dec. 31, 2016
USD ($)
Debt Instrument [Line Items]        
Line of credit, borrowing capacity     $ 38,500,000  
Revolving Loan Facility, minimum cash and cash equivalents required $ 10,000,000      
Revolving Loan Facility     $ 27,103,000 $ 24,712,000
Convertible Notes        
Debt Instrument [Line Items]        
Convertible senior notes   $ 230,000,000    
Stated interest rate   2.625% 2.625%  
Conversion ratio     31.9020  
Conversion price (in dollars per share) | $ / shares     $ 31.35  
Threshold percentage of stock price trigger     130.00%  
Percent of principal amount redeemed     100.00%  
Proceeds from debt, net of issuance costs   $ 222,500,000    
Debt issuance costs   $ 7,500,000    
Discount amortization period     7 years  
Long term debt     $ 230,000,000 230,000,000
Term Loan        
Debt Instrument [Line Items]        
Stated interest rate     8.28444%  
Debt instrument, term 5 years      
Debt instrument, face amount $ 60,000,000      
Debt Instrument, exit fee 4.00%      
Long term debt     $ 60,000,000 60,000,000
Line of Credit        
Debt Instrument [Line Items]        
Stated interest rate     5.23%  
Debt instrument, term 5 years      
Line of credit, borrowing capacity $ 50,000,000      
Line of credit, maximum availability $ 70,000,000      
Line of credit, fee percentage on unused portion 0.50%      
Borrowings under revolving line of credit 35.00%      
Percentage of average borrowing base after first anniversary 50.00%      
Revolving Loan Facility     $ 27,103,000 $ 24,712,000
Minimum | London Interbank Offered Rate (LIBOR)        
Debt Instrument [Line Items]        
Debt instrument, EBITDA required to reduce LIBOR margin rate $ 6,000,000      
Minimum | Term Loan | London Interbank Offered Rate (LIBOR)        
Debt Instrument [Line Items]        
Line of credit, interest rate spread 6.50%      
Maximum | Term Loan | London Interbank Offered Rate (LIBOR)        
Debt Instrument [Line Items]        
Line of credit, interest rate spread 7.50%      
Maximum | Line of Credit | London Interbank Offered Rate (LIBOR)        
Debt Instrument [Line Items]        
Line of credit, interest rate spread 4.45%