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Debt Obligations (Details Textuals) (USD $) | 6 Months Ended |  |  |  | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Feb. 01, 2012 Unsecured Debt [Member] | Jun. 30, 2012 Letter of Credit [Member] Unsecured Debt [Member] | Jun. 30, 2012 New Revolving Credit Facility [Member] Unsecured Debt [Member] | Dec. 15, 2011 New Revolving Credit Facility [Member] Unsecured Debt [Member] | Jun. 30, 2012 Bank Term Loan and the Credit Facility [Member] Unsecured Debt [Member] | Jun. 30, 2012 $300.0M 5.750% Guaranteed Notes due 2012 [Member] Unsecured Debt [Member] | Jun. 30, 2012 $250.0M 5.400% Guaranteed Notes due 2014 [Member] Unsecured Debt [Member] | Jun. 30, 2012 $250.0M 7.500% Guaranteed Notes due 2015 [Member] Unsecured Debt [Member] | Jun. 30, 2012 $250.0M 6.000% Guaranteed Notes due 2016 [Member] Unsecured Debt [Member] | Jun. 30, 2012 $300.0M 5.700% Guaranteed Notes due 2017 [Member] Unsecured Debt [Member] | Jun. 30, 2012 $325.0M 4.950% Guaranteed Notes due 2018 [Member] Unsecured Debt [Member] | Feb. 01, 2012 Three Year Term Loan [Member] Unsecured Debt [Member] | Feb. 01, 2012 Four Year Term Loan [Member] Unsecured Debt [Member] | Feb. 01, 2012 Seven Year Term Loan [Member] Unsecured Debt [Member]
Debt obligations (Textuals) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | $ 600,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  | 600,000,000 |  |  |  |  | 300,000,000 | 250,000,000 | 250,000,000 | 250,000,000 | 300,000,000 | 325,000,000 | 150,000,000 | 250,000,000 | 200,000,000
Repayments of Unsecured Debt | 37,500,000 | 0 |  |  |  |  | 183,000,000 |  |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  | 3,200,000 |  |  |  |  |  |  |  |  |  |  |  |
Option for additional borrowings subject to customary conditions and limitations |  |  |  |  |  | 200,000,000 |  |  |  |  |  |  |  |  |  |
Unused availability under the Credit Facility |  |  |  |  | $ 596,800,000 |  |  |  |  |  |  |  |  |  |  |

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- Definition Line of Credit Facility, Option for Additional Borrowing Capacity subject to customary conditions and limitations + 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 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. Reference 2: 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 3: 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 + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The cash outflow to repay long-term debt that is not secured by collateral. Excludes repayments of tax exempt unsecured debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph b -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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