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Debt Instruments (Details) (USD $)
12 Months Ended
Dec. 31, 2012
May 30, 2012
Dec. 31, 2011
Dec. 31, 2012
February 2011 Amended US Term Loan [Member]
Dec. 31, 2011
February 2011 Amended US Term Loan [Member]
Dec. 31, 2012
Amended 2010 Credit Agreement [Member]
Dec. 31, 2012
Senior Unsecured Notes [Member]
Notes Payable Due 2018 [Member]
Dec. 31, 2012
Maximum [Member]
Amended 2010 Credit Agreement [Member]
Debt Instrument [Line Items]                
Debt Instrument Restricted Payment               $ 20,000,000
Debt Instrument Consolidated Leverage Ratio           3.94    
Fair value of term debt 1,117,100,000   1,159,300,000          
Revolving credit facility 0   0          
Notes payable 401,080,000   400,279,000          
Term debt       1,131,100,000 1,156,100,000      
Long-term debt 1,532,180,000   1,556,379,000          
Less: current portion 0 (16,000,000) (15,921,000)          
Long-term debt, noncurrent 1,532,180,000   1,540,458,000          
Redemption percentage of original face amount             100.00%  
Debt Instrument Early Call Date Percentage Of Notes Availabe For Redemption             35.00%  
Debt Instrument Early Call Date Premium Price Percentage             109.125%  
Fair value of notes $ 353,800,000   $ 368,100,000