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Debt (Narrative) (Details) (USD $) | 12 Months Ended | 0 Months Ended | 12 Months Ended |  | 0 Months Ended | 12 Months Ended |  | 0 Months Ended | 12 Months Ended |  | 0 Months Ended |  | 12 Months Ended |  |  |
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Jul. 21, 2003 4.375% Senior Notes [Member] | Jul. 21, 2003 5.75% Senior Notes [Member] | Dec. 31, 2011 5.75% Senior Notes [Member] | Dec. 31, 2010 5.75% Senior Notes [Member] | Mar. 25, 2008 6.50% Senior Notes [Member] | Dec. 31, 2011 6.50% Senior Notes [Member] | Dec. 31, 2010 6.50% Senior Notes [Member] | Oct. 11, 2011 Old Senior Credit Facility [Member] | Dec. 31, 2011 New Senior Credit Facility [Member] | Oct. 11, 2011 New Senior Credit Facility [Member] Term Loan Facility [Member] | Oct. 11, 2011 New Senior Credit Facility [Member] Letters Of Credit [Member] | Oct. 11, 2011 New Senior Credit Facility [Member] Revolving Credit Facility [Member] | Oct. 11, 2011 Amended Receivables Credit Facility Agreement [Member] | Dec. 31, 2011 Amended Receivables Credit Facility Agreement [Member] | Dec. 31, 2011 Receivables Credit Facility [Member] | Oct. 11, 2011 Receivables Credit Facility [Member] | Dec. 31, 2010 Receivables Credit Facility [Member] | Dec. 31, 2011 Receivables Credit Facility [Member] Revolving Credit Facility [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Offerings to qualified institutional investors |  |  |  | $ 150,000,000 | $ 400,000,000 |  |  | $ 150,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes, stated percentage |  |  |  | 4.375% | 5.75% | 5.75% | 5.75% | 6.50% | 6.50% | 6.50% |  |  |  |  |  |  |  |  |  |  |
Senior notes |  |  |  |  |  | 399,486,000 | 399,143,000 |  | 149,962,000 | 149,956,000 |  |  |  |  |  |  |  |  |  |  |
Debt instrument maturity |  |  |  |  |  | Aug. 01, 2013 |  |  | Mar. 15, 2018 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument Maturity Year |  |  |  | 2008 | 2013 |  |  | March 15, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, effective interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.15% |  | 1.56% |
Credit facility, expiration date |  |  |  |  |  |  |  |  |  |  | April 2013 | October 11, 2016 |  |  |  | October 11, 2014 |  | October 11, 2014 |  |  |
Credit facility borrowing capacity | 450,000,000 |  |  |  |  |  |  |  |  |  |  |  | 150,000,000 | 50,000,000 | 250,000,000 | 200,000,000 |  | 200,000,000 | 150,000,000 |  | 200,000,000
Outstanding letters of credit | 14,300,000 |  |  |  |  |  |  |  |  |  |  | 14,300,000 |  |  |  |  |  |  |  |  |
Unused borrowing capacity |  |  |  |  |  |  |  |  |  |  |  | 235,700,000 |  |  |  |  | 91,000,000 |  |  |  |
Annual principal maturities for debt, 2012 | 15,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual principal maturities for debt, year two | 415,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual principal maturities for debt, year three | 124,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual principal maturities for debt, year four | 15,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual principal maturities for debt, year five | 90,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual principal maturities for debt, after year five | 150,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest payments for debt obligations | 35,200,000 | 35,300,000 | 35,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility outstanding | 123,312,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 109,000,000 |  |  |
Outstanding principal balance, maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 109,000,000 |  |  |

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- Definition Carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. Senior note holders are paid off in full before any payments are made to junior note holders. + 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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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