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LONG-TERM DEBT: (Details 1) (USD $)
 9 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Total Debt $ 820,450,000 $ 824,078,000
Interest Coverage 1.36  
Senior Secured Leverage 3.55  
Total Leverage 6.91  
Credit Agreement 2011 [Member]
    
Pro Forma Last Twelve Months Covenant EBITDA 97,500,000  
Pro Forma Last Twelve Months Interest Expense 71,400,000  
Senior Debt 346,300,000  
Total Debt $ 673,300,000  
Senior Secured Debt [Member] | Covenant Limit [Member] | Credit Agreement 2011 [Member]
    
Interest Coverage 1.10  
Senior Secured Leverage 4.50  
Total Leverage 8.50  
Senior Secured Debt [Member] | Excess Coverage [Member] | Credit Agreement 2011 [Member]
    
Interest Coverage 0.26  
Senior Secured Leverage 0.95  
Total Leverage 1.59