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6. Long-Term Debt (Details) (USD $)
6 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2013
Subordinated Debt [Member]
Senior Subordinated Notes 8.0% [Member]
Dec. 31, 2012
Subordinated Debt [Member]
Senior Subordinated Notes 8.0% [Member]
Jun. 30, 2013
Unsecured Debt [Member]
Senior Notes 4.875% [Member]
Dec. 31, 2012
Unsecured Debt [Member]
Senior Notes 4.875% [Member]
Jun. 30, 2013
Capital Lease Obligations [Member]
Dec. 31, 2012
Capital Lease Obligations [Member]
Jun. 30, 2010
Line of Credit [Member]
Jun. 30, 2013
Line of Credit [Member]
Debt Instrument [Line Items]                    
Long-term debt $ 733,000,000 $ 732,600,000 $ 297,300,000 $ 296,900,000 $ 423,100,000 $ 423,000,000 $ 12,600,000 $ 12,700,000    
Less current maturities (200,000) (200,000)                
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 $ 732,800,000 $ 732,414,000