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Indebtedness (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2012
Indebtedness |
Schedule of indebtedness |
|  | As of December 31, |
--- | --- | --- | ---
|  | 2012 |  | 2011 |
Senior Notes, due 2012 at 6.85% |  | $ | — |  | $ | 100,829 |
Senior Notes, due 2013 at 6.75% |  |  | — |  |  | 287,000 |
Senior Notes, due 2014 at 7.875% |  |  | 300,000 |  |  | 300,000 |
Senior Notes, due 2015 at 5.125% |  |  | 280,000 |  |  | 280,000 |
Senior Notes, due 2016 at 6.3% |  |  | 275,000 |  |  | 275,000 |
Senior Notes, due 2017 at 5.625% |  |  | 300,000 |  |  | 300,000 |
Senior Notes, due 2018 at 6.7% |  |  | 350,000 |  |  | 350,000 |
Senior Notes, due 2022 at 5.0% |  |  | 500,000 |  |  | — |
Convertible Senior Notes, due 2027 at 3.8% |  |  | 8,478 |  |  | 79,054 |
Unamortized discounts |  |  | (11,120 | ) |  | (5,169 | )
Total unsecured senior notes |  |  | 2,002,358 |  |  | 1,966,714 |
Unsecured revolving credit facility |  |  | 320,000 |  |  | 149,000 |
Unsecured term loan |  |  | 400,000 |  |  | — |
|  | $ | 2,722,358 |  | $ | 2,115,714 |
Required principal payments during the next five years and thereafter |
2013 |  | $ | — |
2014 |  |  | 300,000 |
2015 |  |  | 600,000 | (1)
2016 |  |  | 275,000 |
2017 |  |  | 700,000 | (2)
Thereafter |  |  | 858,478 | (3)
|  | $ | 2,733,478 |
(1) Includes the $320,000 outstanding on our $750,000 revolving credit facility at December 31, 2012. (2) Includes our $400,000 unsecured term loan. (3) Includes our $8,478 convertible senior notes due 2027. Holders of our convertible senior notes may require us to repurchase all or a portion of the notes on March 15, 2017 and March 15, 2022, or upon the occurrence of certain change in control events.

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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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- Definition Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented. + 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 + Details
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