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LONG-TERM DEBT: (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Total debt $ 820,450 $ 824,078
Less: current portion 3,840 4,587
Less: original issue discount 4,242 5,360
Long-term debt, net 812,368 814,131
Senior Bank Term Debt [Member]
   
Total debt 374,416 377,297
Senior Subordinated Notes [Member]
   
Total debt 327,034  
Senior Subordinated Notes [Member] | February 2013 [Member]
   
Total debt 0 747
Senior Subordinated Notes [Member] | May 2016 [Member]
   
Total debt 327,034 327,034
Senior Notes [Member]
   
Total debt 119,000  
Senior Notes [Member] | March 2016 [Member]
   
Total debt $ 119,000 $ 119,000