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LONG-TERM DEBT: (Details Textual) (USD $)
 3 Months Ended 3 Months Ended 9 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Mar. 31, 2011
Sep. 30, 2013
Credit Agreement 2011 [Member]
Sep. 30, 2013
Credit Agreement 2011 [Member]
Jun. 30, 2011
Credit Agreement 2011 [Member]
Term Loan [Member]
Dec. 31, 2012
Senior Subordinated Notes [Member]
Sep. 30, 2013
Senior Subordinated Notes [Member]
Dec. 31, 2012
Senior Subordinated Notes [Member]
February 2013 [Member]
Sep. 30, 2013
Senior Subordinated Notes [Member]
February 2013 [Member]
Sep. 30, 2013
Senior Notes [Member]
Feb. 25, 2011
Senior Notes [Member]
Sep. 30, 2013
Senior Notes [Member]
March 2016 [Member]
Dec. 31, 2012
Senior Notes [Member]
March 2016 [Member]
Sep. 30, 2013
Revolving Credit Facility [Member]
Credit Agreement 2011 [Member]
Sep. 30, 2013
Line of Credit [Member]
Credit Agreement 2011 [Member]
Mar. 31, 2011
Line of Credit [Member]
Credit Agreement 2011 [Member]
Nov. 30, 2010
Notes 2011 [Member]
Nov. 24, 2010
Notes 2011 [Member]
Senior Subordinated Notes [Member]
Nov. 30, 2010
Notes 2013 [Member]
Sep. 30, 2013
May 2016 [Member]
Senior Subordinated Notes [Member]
Nov. 30, 2010
May 2016 [Member]
Senior Subordinated Notes [Member]
Nov. 24, 2010
May 2016 [Member]
Senior Subordinated Notes [Member]
Term Loan Facility Carrying Amount     $ 386,000,000                                        
Debt Instrument, Face Amount             14,200,000         119,000,000         411,000,000 101,500,000   200,000,000 327,000,000   286,800,000
Debt Instrument, Fair Value Disclosure                 740,000                       331,500,000    
Revolving Loan Facility Carrying Amount     25,000,000                                        
Covenant Compliance Description For Maintaining Interest Coverage Ratio         maintaining an interest coverage ratio of no less than: 1.10 to 1.00 on December 31, 2012, and the last day of each fiscal quarter throughDecember 31, 2013; 1.20 to 1.00 on March 31, 2014, and the last day of each fiscal quarter throughSeptember 30, 2014; 1.25 to 1.00 on December 31, 2014, and the last day of each fiscal quarter throughSeptember 30, 2015; and 1.50 to 1.00 on December 31, 2015, and the last day of each fiscal quarter thereafter.                                    
Covenant Compliance Description For Maintaining Senior Secured Leverage Ratio         maintaining a senior secured leverage ratio of no greater than: 4.50 to 1.00 on September 30, 2012, and the last day of each fiscal quarter throughDecember 31, 2013; 4.25 to 1.00 on March 31, 2014, and the last day of each fiscal quarter throughJune 30, 2014; 4.00 to 1.00 on September30, 2014; 3.75 to 1.00 on December 31, 2014; 3.25 to 1.00 on March 31, 2015, and the last day of each fiscal quarter throughSeptember 30, 2015; and 2.75 to 1.00 on December 31, 2015, and the last day of each fiscal quarter thereafter.                                    
Covenant Compliance Description For Maintaining Total Leverage Ratio         maintaining a total leverage ratio of no greater than: 8.50 to 1.00 on December 31, 2012, and the last day of each fiscal quarter throughDecember 31, 2013; 8.25 to 1.00 on March 31, 2014, and June 30, 2014; 8.00 to 1.00 on September 30, 2014; 7.50 to 1.00 on December 31, 2014; 6.50 to 1.00 on March 31, 2015, and the last day of each fiscal quarter throughSeptember 30, 2015; and 6.00 to 1.00 on December 31, 2015, and the last day of each fiscal quarter thereafter.                                    
Covenant Limitations Description         limitations on: § liens; § sale of assets; § payment of dividends; and § mergers.                                    
Debt Instrument, Description of Variable Rate Basis         Under the terms of the 2011 Credit Agreement, as amended, interest on base rate loans is payable quarterly and interest on LIBOR loans is payable monthly or quarterly. The base rate is equal to the greater of: (i) the prime rate; (ii) the Federal Funds Effective Rate plus 0.50%; or (iii) the LIBOR Rate for a one-month period plus 1.00%. The applicable margin on the 2011 Credit Agreement is between (i) 4.50% and 5.50% on the revolving portion of the facility and (ii) 5.00% (with a base rate floor of 2.5% per annum) and 6.00% (with a LIBOR floor of 1.5% per annum) on the term portion of the facility.                                    
Debt Instrument, Interest Rate During Period 7.50%                                            
Debt Instrument Periodic Payment Percentage Of Principal           0.25%                                  
Debt Instrument, Periodic Payment, Principal           960,000                                  
Line of Credit Facility, Current Borrowing Capacity                             24,000,000                
Line of Credit Facility, Remaining Borrowing Capacity                             24,000,000                
Line of Credit Facility, Amount Outstanding                               374,400,000              
Repayments of Long-term Lines of Credit       1,000,000 2,900,000                                    
Percentage Of Financial Instrument                   6.375%                 8.88%   12.50% 15.00%  
Long-term Debt, Gross 820,450,000 824,078,000   673,300,000 673,300,000     327,034,000 747,000 0 119,000,000   119,000,000 119,000,000       97,000,000   199,300,000      
Debt Instrument, Periodic Payment, Interest                 $ 24,000                            
Percentage Of Cash Paid For Interest             6.00%                                
Percentage Of Paid In Kind Interest Paid             9.00%                                
Debt Instrument, Interest Rate, Stated Percentage                       10.00%