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Debt (Details) (USD $) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended |  |  | 12 Months Ended |  | 12 Months Ended |  |  |
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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 |  |  |  |  |  |

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- Definition Description of a feature that permits the issuer of the debt to repay or convert it before the stated maturity date (early retirement date). The description may include such items as the call price, the period that the issuer can call the debt, including the earliest call date, and other significant terms of the call feature, which may include the debt holders' ability to convert the debt to equity if the call option is exercised and contingent events that trigger the issuer's ability to call the debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(5)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Description of minimum financial levels (for example, tangible net worth and working capital) and achievement of certain financial ratios (for example, working capital ratio and debt service coverage ratio), and adherence to certain clauses which generally require or restrict certain actions (for example, entering into a debt arrangement with equal or greater seniority, and selling or discontinuing a certain business segment or material subsidiary) to be in compliance with the covenant clauses of the debt agreement. May also include a discussion of the adverse consequences that would result if the entity violates or fails to satisfy the covenants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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