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TERM DEBT: (Details)
3 Months Ended
Feb. 23, 2016
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Debt Instrument [Line Items]      
Debt instrument, issuance date Feb. 22, 2016    
Debt instrument, face amount $ 280,000,000    
Debt instrument, maturity date Feb. 21, 2019    
Debt issuance costs $ 5,500,000    
Term Debt, principal amount   $ 226,000,000  
Less unamortized debt issuance costs   3,102,000  
Term Debt, principal net of unamortized debt issuance costs   $ 222,898,000  
Interest rate, effective percentage   3.40%  
Frequency of periodic payment quarterly    
Maturity date range, end Feb. 21, 2019    
Repayments of secured debt   $ 20,000,000 $ 0
2017 remainder of year   5,500,000  
2018   63,000,000  
2019   157,500,000  
Debt, long-term and short-term, combined amount   $ 226,000,000  
Pledge, percentage equity interest 1    
Repayment terms Quarterly amortization payments on the term loans of: (i) 2.50% of the original principal amount for the four fiscal quarters beginning on June 2016 and ending on March 2017, (ii)3.75% of the original principal amount for the four fiscal quarters beginning on June 2017 and ending on March 2018 and (iii) 6.25% of the original principal amount for the three fiscal quarters beginning on June 2018 and ending on December 2018. On the maturity date, the Company will be required to pay all remaining outstanding amounts under the term loans.    
Eurodollar [Member]      
Debt Instrument [Line Items]      
Interest rate, stated percentage 1.00%    
Description of variable rate basis one-month LIBOR    
Base Rate [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate 0.50%    
Description of variable rate basis Base rate (which is the highest of (i) the administrative agent’s prime rate, (ii) one-half of 1.00% in excess of the overnight federal funds rate, and (iii) 1.00% in excess of the one-month Eurodollar rate), plus an applicable margin    
Minimum [Member] | Eurodollar [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate 1.25%    
Minimum [Member] | Base Rate [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate 0.25%    
Maximum [Member] | Eurodollar [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate 2.00%    
Maximum [Member] | Base Rate [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate 1.00%    
June 2016 To March 2017 [Member]      
Debt Instrument [Line Items]      
Periodic quarterly principal payment rate 0.0250    
Maturity date range, start Jun. 30, 2016    
Maturity date range, end Mar. 31, 2017    
June 2017 To March 2018 [Member]      
Debt Instrument [Line Items]      
Periodic quarterly principal payment rate 0.0375    
Maturity date range, start Jun. 30, 2017    
Maturity date range, end Mar. 31, 2018    
June 2018 To December 2018 [Member]      
Debt Instrument [Line Items]      
Periodic quarterly principal payment rate 0.0625    
Maturity date range, start Jun. 30, 2018    
Maturity date range, end Dec. 31, 2018