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Indebtedness (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended | 1 Months Ended | 10 Months Ended | 12 Months Ended |  | 1 Months Ended | 12 Months Ended |  | 0 Months Ended |  |  | 1 Months Ended |  |  | 0 Months Ended |  |  |  |  |  |  |  |  |  |  |  |
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Unsecured revolving credit facility | Dec. 31, 2011 Unsecured revolving credit facility | Dec. 31, 2010 Unsecured revolving credit facility | Mar. 31, 2012 Unsecured term loan | Dec. 31, 2012 Unsecured term loan | Dec. 31, 2012 Unsecured term loan | Mar. 12, 2012 Unsecured term loan | Mar. 31, 2012 Convertible senior notes, due 2027 at 3.8% | Dec. 31, 2012 Convertible senior notes, due 2027 at 3.8% | Dec. 31, 2011 Convertible senior notes, due 2027 at 3.8% | Dec. 31, 2010 Convertible senior notes, due 2027 at 3.8% | Mar. 20, 2012 Convertible senior notes, due 2027 at 3.8% | Apr. 11, 2012 Senior Notes, due 2012 at 6.85% | Dec. 31, 2012 Senior Notes, due 2012 at 6.85% | Dec. 31, 2011 Senior Notes, due 2012 at 6.85% | Aug. 31, 2012 Senior Notes, due 2022 at 5% | Dec. 31, 2012 Senior Notes, due 2022 at 5% | Aug. 16, 2012 Senior Notes, due 2022 at 5% | Sep. 10, 2012 Senior Notes, due 2013 at 6.75% | Dec. 31, 2012 Senior Notes, due 2013 at 6.75% | Dec. 31, 2011 Senior Notes, due 2013 at 6.75% | Dec. 31, 2012 Senior Notes, due 2014 at 7.875% | Dec. 31, 2011 Senior Notes, due 2014 at 7.875% | Dec. 31, 2012 Senior Notes, due 2015 at 5.125% | Dec. 31, 2011 Senior Notes, due 2015 at 5.125% | Dec. 31, 2012 Senior Notes, due 2016 at 6.3% | Dec. 31, 2011 Senior Notes, due 2016 at 6.3% | Dec. 31, 2012 Senior Notes, due 2017 at 5.625% | Dec. 31, 2011 Senior Notes, due 2017 at 5.625% | Dec. 31, 2012 Senior Notes, due 2018 at 6.7% | Dec. 31, 2011 Senior Notes, due 2018 at 6.7%
Indebtedness |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured revolving credit facility |  |  |  | $ 750,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extendable term of credit facility |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured revolving credit facility, maximum borrowing capacity |  |  |  | 1,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured term loan, maximum borrowing capacity |  |  |  |  |  |  |  | 500,000 | 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate description |  |  |  | LIBOR |  |  |  |  | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Margin over base rate, in basis points (as a percent) |  |  |  | 1.30% |  |  |  | 1.45% | 1.45% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate payable for facility fees (as a percent) |  |  |  | 0.30% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  | 1.51% |  |  |  | 1.67% | 1.67% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average interest rate for borrowings (as a percent) |  |  |  | 1.56% | 1.59% | 0.90% |  | 1.70% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current amount outstanding under revolving credit facility |  |  |  | 320,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount available under revolving credit facility |  |  |  | 430,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured revolving credit facility | 320,000 | 149,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of loan |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured term loan | 400,000 |  |  |  |  |  |  |  |  | 400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate stated percentage |  |  |  |  |  |  |  |  |  |  |  | 3.80% | 3.80% |  | 3.80% | 6.85% | 6.85% | 6.85% |  | 5.00% | 5.00% | 6.75% | 6.75% | 6.75% | 7.875% | 7.875% | 5.125% | 5.125% | 6.30% | 6.30% | 5.625% | 5.625% | 6.70% | 6.70%
Repurchase of convertible senior notes |  |  |  |  |  |  |  |  |  |  | 70,576 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated effective interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 6.06% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net carrying amount | 8,478 | 78,823 |  |  |  |  |  |  |  |  |  | 8,478 | 78,823 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized discounts | (11,120) | (5,169) |  |  |  |  |  |  |  |  |  | 0 | 231 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-cash amortization | 6,179 | 6,305 | 7,123 |  |  |  |  |  |  |  |  | 270 | 1,605 | 2,602 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount allocated as the equity component of the notes |  |  |  |  |  |  |  |  |  |  |  | 37,710 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of senior notes | 1,993,880 | 1,887,891 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of senior notes, net of underwriting and other offering expenses | 491,975 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 487,946 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of senior notes | 387,829 |  | 50,000 |  |  |  |  |  |  |  |  |  |  |  |  | 100,829 |  |  |  |  |  | 287,000 |  |  |  |  |  |  |  |  |  |  |  |
Carrying amount | 2,733,478 |  |  |  |  |  |  |  |  |  |  | 8,478 | 79,054 |  |  |  |  | 100,829 |  | 500,000 |  |  |  | 287,000 | 300,000 | 300,000 | 280,000 | 280,000 | 275,000 | 275,000 | 300,000 | 300,000 | 350,000 | 350,000
Initial exchange price (In dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 50.50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total unsecured senior notes | 2,002,358 | 1,966,714 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total indebtedness | 2,722,358 | 2,115,714 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Required principal payments under outstanding debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2014 | 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2015 | 600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2016 | 275,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2017 | 700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Thereafter | 858,478 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total principal payments | $ 2,733,478 |  |  |  |  |  |  |  |  |  |  | $ 8,478 | $ 79,054 |  |  |  |  | $ 100,829 |  | $ 500,000 |  |  |  | $ 287,000 | $ 300,000 | $ 300,000 | $ 280,000 | $ 280,000 | $ 275,000 | $ 275,000 | $ 300,000 | $ 300,000 | $ 350,000 | $ 350,000

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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- Definition Amount borrowed under the credit facility as of the balance sheet date. + 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 + 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 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 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 2: 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 Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 5: 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 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 47 -Paragraph 10 -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. + Details
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- Definition Including the current and noncurrent portions, 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). 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 FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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