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5. Notes Payable and Long-Term Debt (Details) (USD $)
 1 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended
Jan. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Foreign Line of Credit [Member]
Dec. 31, 2011
Foreign Line of Credit [Member]
Jan. 31, 2011
Subordinated Debt [Member]
Senior Subordinated Notes 7.5% [Member]
Aug. 31, 2003
Subordinated Debt [Member]
Senior Subordinated Notes 7.5% [Member]
Dec. 31, 2012
Subordinated Debt [Member]
Senior Subordinated Notes 8.0% [Member]
Dec. 31, 2011
Subordinated Debt [Member]
Senior Subordinated Notes 8.0% [Member]
May 31, 2009
Subordinated Debt [Member]
Senior Subordinated Notes 8.0% [Member]
Dec. 31, 2010
Subordinated Debt [Member]
Senior Subordinated Notes 6.125% [Member]
Dec. 31, 2004
Subordinated Debt [Member]
Senior Subordinated Notes 6.125% [Member]
Dec. 31, 2012
Unsecured Debt [Member]
Senior Notes 4.875% [Member]
Dec. 31, 2011
Unsecured Debt [Member]
Senior Notes 4.875% [Member]
Dec. 31, 2010
Unsecured Debt [Member]
Senior Notes 4.875% [Member]
Dec. 31, 2012
Capital Lease Obligations [Member]
Capital leases and other debt [Member]
Dec. 31, 2011
Capital Lease Obligations [Member]
Capital leases and other debt [Member]
Jun. 30, 2010
Line of Credit [Member]
Dec. 31, 2012
Line of Credit [Member]
Debt Instrument [Line Items]                                        
Long-term debt     $ 732,600,000 $ 732,300,000         $ 296,900,000 $ 296,300,000 $ 294,800,000     $ 423,000,000 $ 422,800,000 $ 422,600,000 $ 12,700,000 $ 13,200,000    
Less current maturities     (200,000) (600,000)                                
Long-term debt, net of current maturities     732,414,000 731,698,000                                
Debt Instrument, Interest Rate, Effective Percentage                     8.30%         4.946%        
Face amount of debt sold               225,000,000     300,000,000   200,000,000     425,000,000        
Debt Instrument, Interest Rate, Stated Percentage               7.50%     8.00%   6.125%     4.875%        
Repayments of subordinated debt             225,000,000         200,000,000                
Early repayment of Subordinated Notes             234,600,000         204,300,000                
Redemption Premium 2,800,000 4,100,000                                    
Percentage of capital stock of certain foreign subsidiaries securing part of Credit Agreement                                     65.00%  
Maturities of Long-term Debt [Abstract]                                        
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months     200,000                                  
Long-term Debt, Maturities, Repayments of Principal in Year Two     200,000                                  
Long-term Debt, Maturities, Repayments of Principal in Year Three     200,000                                  
Long-term Debt, Maturities, Repayments of Principal in Year Four     297,100,000                                  
Long-term Debt, Maturities, Repayments of Principal in Year Five     200,000                                  
Long-term Debt, Maturities, Repayments of Principal after Year Five     434,700,000                                  
Line of Credit Facility, Maximum Borrowing Capacity         27,900,000 21,900,000                           200,000,000
Line of Credit Facility, Amount Outstanding                                       0
Line of Credit Facility, Remaining Borrowing Capacity         $ 23,800,000 $ 17,500,000                            
Line of Credit Facility, Interest Rate at Period End         3.20% 2.70%