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Debt (Narrative) (Details)
1 Months Ended 6 Months Ended
Jun. 09, 2017
USD ($)
Dec. 07, 2015
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2017
USD ($)
$ / shares
Dec. 31, 2016
USD ($)
Debt Instrument [Line Items]          
Line of credit, borrowing capacity       $ 41,600,000  
Revolving loan facility, minimum cash and cash equivalents required   $ 10,000,000      
Revolving Loan Facility       $ 26,162,000 $ 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       8.2005%  
Debt instrument, face amount   $ 90,000,000      
Debt Instrument, exit fee   4.00%      
Debt issuance costs $ 1,700,000        
Legal fees 0        
Long term debt       $ 90,000,000 60,000,000
Line of Credit          
Debt Instrument [Line Items]          
Stated interest rate       5.50%  
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   50.00%      
Revolving Loan Facility       $ 26,162,000 $ 24,712,000
Minimum | London Interbank Offered Rate (LIBOR)          
Debt Instrument [Line Items]          
Debt instrument, EBITDA required to reduce LIBOR margin rate $ 12,500,000        
Minimum | Term Loan | London Interbank Offered Rate (LIBOR)          
Debt Instrument [Line Items]          
Line of credit, interest rate spread   5.95%      
Maximum | Term Loan | London Interbank Offered Rate (LIBOR)          
Debt Instrument [Line Items]          
Line of credit, interest rate spread   7.15%      
Maximum | Line of Credit | London Interbank Offered Rate (LIBOR)          
Debt Instrument [Line Items]          
Line of credit, interest rate spread   4.45%