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DEBT (Details 3)
$ in Thousands
12 Months Ended
Oct. 14, 2015
USD ($)
Jul. 10, 2015
USD ($)
Apr. 08, 2015
USD ($)
Apr. 07, 2015
USD ($)
installment
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Line of Credit Facility            
Debt classified as current liability         $ 588,434 $ 34,324
Revolving credit facility | 2015 Revolving Credit Facility            
Line of Credit Facility            
Maximum borrowing capacity       $ 59,500    
Quarterly reduction of total amount committed       $ 1,641    
Number of quarterly installments | installment       20    
Commitment fee on unused daily average unutilized commitment (as a percent)       1.50%    
Period after agreement date for first periodic payment       3 months    
Drawdowns during the period $ 21,218 $ 10,000 $ 25,000   56,218  
Long-term debt         56,218 $ 0
Debt classified as current liability         56,218  
Repayment of the outstanding debt            
2016         6,565  
2017         6,565  
2018         6,565  
2019         6,565  
2020         29,958  
Long-term Line of Credit, Total         $ 56,218  
Revolving credit facility | 2015 Revolving Credit Facility | LIBOR            
Line of Credit Facility            
Reference rate for interest payable       LIBOR    
Revolving credit facility | 2015 Revolving Credit Facility | Minimum | LIBOR            
Line of Credit Facility            
Applicable margin over reference rate for interest payable       3.40%    
Revolving credit facility | 2015 Revolving Credit Facility | Maximum | LIBOR            
Line of Credit Facility            
Applicable margin over reference rate for interest payable       4.25%