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6. Long-Term Debt (Details) (USD $)
 3 Months Ended 9 Months Ended 6 Months Ended
Sep. 30, 2013
Sep. 30, 2013
Dec. 31, 2012
May 31, 2009
Sep. 30, 2013
Subordinated Debt [Member]
Senior Subordinated Notes 8.0% [Member]
Dec. 31, 2012
Subordinated Debt [Member]
Senior Subordinated Notes 8.0% [Member]
May 31, 2009
Subordinated Debt [Member]
Senior Subordinated Notes 8.0% [Member]
Sep. 30, 2013
Unsecured Debt [Member]
Senior Notes 4.875% [Member]
Dec. 31, 2012
Unsecured Debt [Member]
Senior Notes 4.875% [Member]
Sep. 30, 2013
Capital Lease Obligations [Member]
Dec. 31, 2012
Capital Lease Obligations [Member]
Jun. 30, 2010
Line of Credit [Member]
Sep. 30, 2013
Line of Credit [Member]
Debt Instrument [Line Items]                          
Debt Instrument, Interest Rate, Stated Percentage       8.00%                  
Long-term debt $ 435,700,000 $ 435,700,000 $ 732,600,000 $ 294,800,000 $ 0 $ 296,900,000   $ 423,200,000 $ 423,000,000 $ 12,500,000 $ 12,700,000    
Less current maturities (200,000) (200,000) (200,000)                    
Face amount of debt sold             300,000,000            
Early repayment of Subordinated Notes 312,000,000                        
Redemption Premium 12,000,000                        
Debt Instrument, Unamortized Discount 2,500,000 2,500,000                      
Unamortized Debt Issuance Expense 1,100,000 1,100,000                      
Loss on Extinguishment of Debt 15,600,000 15,600,000                      
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 $ 435,541,000 $ 435,541,000 $ 732,414,000