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Debt (Details) (USD $)
 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Long Term Debt [Member]
Dec. 31, 2012
Long Term Debt [Member]
Dec. 31, 2013
Senior unsecured notes - Series A [Member]
Dec. 31, 2012
Senior unsecured notes - Series A [Member]
Feb. 01, 2010
Senior unsecured notes - Series A [Member]
Dec. 31, 2013
Senior unsecured notes - Series B [Member]
Dec. 31, 2012
Senior unsecured notes - Series B [Member]
Feb. 01, 2010
Senior unsecured notes - Series B [Member]
Dec. 31, 2013
Senior unsecured notes - Series C [Member]
Dec. 31, 2012
Senior unsecured notes - Series C [Member]
Mar. 15, 2011
Senior unsecured notes - Series C [Member]
Dec. 31, 2013
Senior unsecured notes - Series D [Member]
Dec. 31, 2012
Senior unsecured notes - Series D [Member]
Mar. 15, 2011
Senior unsecured notes - Series D [Member]
Dec. 31, 2013
Senior unsecured notes - Series E [Member]
Dec. 31, 2012
Senior unsecured notes - Series E [Member]
Mar. 15, 2011
Senior unsecured notes - Series E [Member]
Dec. 31, 2013
Foreign subsidiary lines of credit [Member]
Dec. 31, 2012
Foreign subsidiary lines of credit [Member]
Dec. 31, 2013
Unsecured debt [Member]
Dec. 31, 2012
Unsecured debt [Member]
Mar. 15, 2011
Unsecured debt [Member]
Dec. 31, 2013
Credit Agreement dated July 2011 [Member]
Dec. 31, 2012
Credit Agreement dated July 2011 [Member]
Dec. 31, 2012
Credit Agreement dated July 2011 [Member]
Revolving facilities [Member]
Dec. 31, 2013
Credit Agreement dated June 2013 [Member]
Jun. 25, 2013
Credit Agreement dated June 2013 [Member]
Term loan facility [Member]
Dec. 31, 2013
Credit Agreement dated June 2013 [Member]
Revolving facilities [Member]
Jun. 25, 2013
Credit Agreement dated June 2013 [Member]
Revolving facilities [Member]
Debt [Line Items]                                                              
Face value of debt                                               $ 200,000,000         $ 300,000,000   $ 1,100,000,000
Stated interest rate on debt instrument             3.75%     5.00%     2.50%     3.22%     3.97%                        
Interest rate terms on debt                                                       The interest rates applicable to the 2013 Credit Agreement are, at the Company’s option, equal to either the alternate base rate calculated daily (which is a rate per annum equal to the greatest of (a) the prime rate in effect on such day, (b) the federal funds effective rate in effect on such day plus 1/2% per annum, or (c) the adjusted LIBO rate on such day (or if such day is not a business day, the immediately preceding business day) for a deposit in U.S. dollars with a maturity of one month plus 1% per annum) or the applicable 1, 2, 3 or 6 month adjusted LIBO rate, in each case, plus an interest rate margin based upon the Company’s leverage ratio, which can range between 0 to 12.5 basis points for alternate base rate loans and between 75 basis points and 112.5 basis points for adjusted LIBO rate loans.      
Debt facility fee                                                       The facility fee on the 2013 Credit Agreement ranges between 12.5 basis points and 25 basis points.      
Call feature on debt instrument                                           The Company may prepay all or some of the senior unsecured notes at any time in an amount not less than 10% of the aggregate principal amount outstanding, plus the applicable make-whole amount. In the event of a change in control (as defined in the note purchase agreement) of the Company, the Company may be required to prepay the senior unsecured notes at a price equal to 100% of the principal amount thereof, plus accrued and unpaid interest.                  
Debt covenant description                                           These senior unsecured notes require that the Company comply with an interest coverage ratio test of not less than 3.50:1 for any period of four consecutive fiscal quarters and a leverage ratio test of not more than 3.50:1 as of the end of any fiscal quarter.           The 2013 Credit Agreement requires that the Company comply with an interest coverage ratio test of not less than 3.50:1 as of the end of any fiscal quarter for any period of four consecutive fiscal quarters and a leverage ratio test of not more than 3.50:1 as of the end of any fiscal quarter.      
Notes payable and debt 133,346,000 132,781,000                                   8,346,000 7,781,000           125,000,000     125,000,000  
Long-term debt 1,190,000,000 1,045,000,000     100,000,000 100,000,000   100,000,000 100,000,000   50,000,000 50,000,000   100,000,000 100,000,000   50,000,000 50,000,000       400,000,000 400,000,000     645,000,000   790,000,000   490,000,000  
Total debt 1,323,346,000 1,177,781,000                                                          
Weighted-average interest rate     1.94% 2.11%                               2.00% 2.00%                    
Unused borrowing capacity                                                   428,000,000   483,000,000      
Line of credit maximum borrowing capacity                                       87,000,000 107,000,000                    
Voluntary prepayment of long-term debt                                                 $ 860,000,000