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5. Long-Term Debt (Details) (USD $)
1 Months Ended1 Months Ended9 Months Ended
Sep. 30, 2011
Dec. 31, 2010
Jan. 31, 2011
Subordinated Debt [Member]
Senior Subordinated Notes 7.5% [Member]
Sep. 30, 2011
Subordinated Debt [Member]
Senior Subordinated Notes 7.5% [Member]
Dec. 31, 2010
Subordinated Debt [Member]
Senior Subordinated Notes 7.5% [Member]
Aug. 31, 2003
Subordinated Debt [Member]
Senior Subordinated Notes 7.5% [Member]
Sep. 30, 2011
Subordinated Debt [Member]
Senior Subordinated Notes 8.0% [Member]
Dec. 31, 2010
Subordinated Debt [Member]
Senior Subordinated Notes 8.0% [Member]
Dec. 31, 2010
Subordinated Debt [Member]
Senior Subordinated Notes 6.125% [Member]
Sep. 30, 2011
Unsecured Debt [Member]
Senior Notes 4.875% [Member]
Dec. 31, 2010
Unsecured Debt [Member]
Senior Notes 4.875% [Member]
Sep. 30, 2011
Capital Lease Obligations [Member]
Dec. 31, 2010
Capital Lease Obligations [Member]
Sep. 30, 2010
Line of Credit [Member]
Sep. 30, 2011
Line of Credit [Member]
Debt Instrument [Line Items]               
Long-term debt$ 732,300,000$ 964,200,000 $ 0$ 225,000,000 $ 296,100,000$ 295,600,000 $ 422,800,000$ 422,600,000$ 13,400,000$ 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$ 731,597,000$ 731,100,000