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Long-Term Debt (Details Textual) (USD $) | 12 Months Ended |  |  | 12 Months Ended |  |  |  | 12 Months Ended |  |
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Dec. 31, 2012 | Dec. 31, 2010 | Dec. 31, 2012 7.125% Notes, due May 2016 [Member] | Oct. 03, 2012 7.125% Notes, due May 2016 [Member] | Dec. 31, 2012 5.375 Percent Notes [Member] | Oct. 03, 2012 5.375 Percent Notes [Member] | Dec. 31, 2012 Letter of Credit [Member] | Dec. 31, 2011 Letter of Credit [Member] | Dec. 31, 2012 Revolving Credit Facility [Member] | Nov. 21, 2011 Revolving Credit Facility [Member] | Dec. 31, 2012 Maximum [Member] Revolving Credit Facility [Member] | Dec. 31, 2012 Minimum [Member] Revolving Credit Facility [Member]
Long-Term Debt (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  | $ 350,000,000 |  |
Debt instrument maturity date |  |  |  |  | Oct. 15, 2020 |  |  |  | Nov. 21, 2016 |  |  |
Federal fund rate Spread |  |  |  |  |  |  |  |  |  |  | 1.25% | 0.25%
Spread, Euro-rate |  |  |  |  |  |  |  |  |  |  | 2.25% | 1.25%
Outstanding Amount of Debt |  |  |  | 200,000,000 |  | 250,000,000 |  |  |  |  |  |
Proceeds from note offering, net of original issue discount | 250,000,000 | 95,000,000 |  |  | 245,100,000 |  |  |  |  |  |  |
Letter of credit outstanding |  |  |  |  |  |  | 5,200,000 | 4,600,000 |  |  |  |
Percentage of aggregate principal amount of outstanding | 5.375% | 7.125% | 7.125% | 7.125% | 5.375% | 5.375% |  |  |  |  |  |
Long-Term Debt (Additional Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Margin over federal fund rate | 0.50% |  |  |  |  |  |  |  |  |  |  |
Margin over Euro-rate | 1.00% |  |  |  |  |  |  |  |  |  |  |
Redemption rate | 102.375% |  |  |  |  |  |  |  |  |  |  |
Redemption premium | 4,800,000 |  |  |  |  |  |  |  |  |  |  |
Write-off of the related unamortized deferred financing fees | 1,900,000 |  |  |  |  |  |  |  |  |  |  |
Unamortized deferred debt issuance costs | $ 4,800,000 |  |  |  |  |  |  |  |  |  |  |

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- Definition Margin over Euro-rate. + References No definition available. + Details
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- Definition The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition The excess of the (1) fair value of consideration transferred to the holders of a security in excess of (2) the carrying amount of the security reported on the registrant's balance sheet, which will be deducted from net earnings to derive net earnings available to common shareholders. This amount is generally an adjustment considered in the computation of earnings per share. + References No definition available. + Details
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