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5. Long-Term Debt (Details) (USD $)
1 Months Ended 1 Months Ended 6 Months Ended
Jun. 30, 2011
Dec. 31, 2010
Jan. 31, 2011
Subordinated Debt [Member]
Senior Subordinated Notes 7.5% [Member]
Jun. 30, 2011
Subordinated Debt [Member]
Senior Subordinated Notes 7.5% [Member]
Dec. 31, 2010
Subordinated Debt [Member]
Senior Subordinated Notes 7.5% [Member]
Aug. 31, 2003
Subordinated Debt [Member]
Senior Subordinated Notes 7.5% [Member]
Jun. 30, 2011
Subordinated Debt [Member]
Senior Subordinated Notes 8.0% [Member]
Dec. 31, 2010
Subordinated Debt [Member]
Senior Subordinated Notes 8.0% [Member]
Dec. 31, 2010
Subordinated Debt [Member]
Senior Subordinated Notes 6.125% [Member]
Jun. 30, 2011
Unsecured Debt [Member]
Senior Notes 4.875% [Member]
Dec. 31, 2010
Unsecured Debt [Member]
Senior Notes 4.875% [Member]
Jun. 30, 2011
Capital Lease Obligations [Member]
Dec. 31, 2010
Capital Lease Obligations [Member]
Jun. 30, 2010
Line of Credit [Member]
Jun. 30, 2011
Line of Credit [Member]
Debt Instrument [Line Items]                              
Long-term debt $ 732,000,000 $ 964,200,000   $ 0 $ 225,000,000   $ 296,000,000 $ 295,600,000   $ 422,700,000 $ 422,600,000 $ 13,300,000 $ 21,000,000    
Less current maturities (700,000) (233,100,000)                          
Face amount of debt sold           225,000,000         425,000,000        
Repayments of subordinated debt     225,000,000           200,000,000            
Early repayment of Subordinated Notes     234,600,000                        
Line of credit maximum borrowing capacity                             200,000,000
Percentage of capital stock of certain foreign subsidiaries securing part of Credit Agreement                           65.00%  
Outstanding borrowings                             0
Long-term Debt, Excluding Current Maturities $ 731,331,000 $ 731,100,000