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LONG-TERM DEBT: (Details 1) (USD $)
3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Total Debt $ 826,496,000 $ 819,490,000
Interest Coverage 1.61  
Senior Secured Leverage 3.56  
Total Leverage 6.95  
Credit Agreement 2011 [Member]
   
Debt Instrument [Line Items]    
Pro Forma Last Twelve Months Covenant EBITDA 98,700,000  
Pro Forma Last Twelve Months Interest Expense 61,300,000  
Senior Debt 351,100,000  
Total Debt $ 686,100,000  
Senior Secured Debt [Member] | Covenant Limit [Member] | Credit Agreement 2011 [Member]
   
Debt Instrument [Line Items]    
Interest Coverage 1.20  
Senior Secured Leverage 4.25  
Total Leverage 8.25  
Senior Secured Debt [Member] | Excess Coverage [Member] | Credit Agreement 2011 [Member]
   
Debt Instrument [Line Items]    
Interest Coverage 0.41  
Senior Secured Leverage 0.69  
Total Leverage 1.30