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Debt (Credit Facility) (Details) (USD $)
12 Months Ended 12 Months Ended
Dec. 31, 2012
Credit Facility Term Loan
Jun. 26, 2012
Credit Facility Term Loan
Dec. 31, 2011
Credit Facility Term Loan
Dec. 31, 2012
Revolving Credit Facility
Jun. 26, 2012
Revolving Credit Facility
Dec. 31, 2011
Revolving Credit Facility
Dec. 31, 2012
Credit Facility Term Loan and Revolver
Jun. 26, 2012
Credit Facility Term Loan and Revolver
Jun. 26, 2012
Credit Facility Term Loan and Revolver
LIBOR
Jun. 26, 2012
Credit Facility Term Loan and Revolver
Base Rate
Jun. 26, 2012
Fiscal Quarters Ending 6/30/2012-12/31/2012
Jun. 26, 2012
Fiscal Quarter Ending 3/31/2013
Jun. 26, 2012
Fiscal Quarter Ending 6/30/2013
Jun. 26, 2012
Fiscal Quarter Ending 9/30/2013
Jun. 26, 2012
Fiscal Quarter Ending 12/31/2013 and Thereafter
Jun. 26, 2012
Fiscal Quarters Ending 6/30/2012 Through 6/30/2013
Jun. 26, 2012
Fiscal Quarter Ending 9/30/2013 and Thereafter
Jun. 26, 2012
Fiscal Year 2012
Jun. 26, 2012
Fiscal Year 2013
Jun. 26, 2012
Fiscal Year 2014 and Thereafter
Jun. 26, 2012
Letter of Credit [Member]
Dec. 31, 2012
Letter of Credit [Member]
Dec. 31, 2011
Letter of Credit [Member]
Dec. 31, 2012
Through June 30, 2013
Credit Facility Term Loan
Dec. 31, 2012
September 30, 2013 through March 31, 2016
Credit Facility Term Loan
Debt Instrument                                                  
Term loan original issuance amount   $ 330,000,000                                              
Maximum borrowing capacity         150,000,000                                        
Credit Facility increased borrowing capacity under certain circumstances               50,000,000                                  
Synthetic leases, amount outstanding             54,000,000                                    
Leverage ratio                     6.50 5.75 4.50 4.00 3.50                    
Fixed charge ratio                               1.00 1.15                
Capital expenditures limit for debt                                   125,000,000 85,000,000 150,000,000          
Available liquidity required during covenant amendment period               50,000,000                                  
Basis spread on variable rate                 4.75% 3.75%                              
Letter of credit fee                                         4.75%        
Revolver, commitment fee percentage             0.75%                                    
Interest rate on Term Loan 5.00%   3.56%                                            
Quarterly principal repayment of Term Loan                                               4,000,000 8,000,000
Amount of borrowings under the Facility       40,000,000                                          
Letters of Credit Outstanding, Amount                                           22,000,000 26,000,000    
Remaining borrowing capacity of the Revolver       $ 88,000,000   $ 124,000,000                                      
Percentage of stocks of domestic subsidiaries, subject to exception and lien             100.00%                                    
Percentage of stocks of foreign subsidiaries, subject to exception and lien             65.00%