v2.4.0.6
LONG-TERM DEBT LIABILITIES (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Debt Instrument [Line Items]      
Senior unsecured notes $ 220,000,000    
Financing method lease obligations 0 12,610,000  
Other 92,000 121,000  
Total 585,202,000 617,731,000  
Current amount of long-term debt (9,808,000) (3,778,000)  
Current amount of finance method lease obligations (12,610,000) 0  
Unamortized original issue discount (2,651,000) (2,897,000)  
Total long-term debt 560,133,000 598,446,000  
Outstanding standby letter of credit 570,000 570,000  
Modification Accounting Of Bank Amendment New Deferred Financing Costs 1,100,000   5,200,000
Modification Accounting Of Bank Amendment Existing Deferred Financing Costs 9,000,000    
Modification Accounting Of Bank Amendment Third Party Costs 100,000    
Previous Credit Facility Financing Costs Deferred Over New Term After Bank Amendment     3,100,000
Revolver, due November 23, 2016
      
Debt Instrument [Line Items]      
Credit Facility 5,000,000 10,000,000  
Term B Loan, due November 23, 2018
      
Debt Instrument [Line Items]      
Credit Facility 347,500,000 375,000,000  
Revolver, due June 30, 2012
      
Debt Instrument [Line Items]      
Credit Facility   650,000,000  
Modification Accounting Of Bank Amendment New Deferred Financing Costs   1,200,000  
Previous Credit Facility Financing Costs Written Off After Bank Amendment   800,000  
Previous Credit Facility Financing Costs Deferred Over New Term After Bank Amendment   300,000  
Term Loan, due June 30, 2012
      
Debt Instrument [Line Items]      
Credit Facility   400,000,000  
Modification Accounting Of Bank Amendment New Deferred Financing Costs   12,800,000  
Previous Credit Facility Financing Costs Written Off After Bank Amendment   300,000  
Unsecured notes due December 1, 2019
      
Debt Instrument [Line Items]      
Senior unsecured notes $ 220,000,000 $ 220,000,000