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Debt (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Long-term debt |  |
Other | $ 11,496 | $ 437
Long-term Debt | 4,082,636 | 4,379,700
Current portion of debt | 11,445 | 364
Long-term debt | 4,071,191 | 4,379,336
6.15% senior notes due February 2018 |  |
Long-term debt |  |
Senior Notes | 969,318 | 968,708
Interest rate on senior note due (as a percent) | 6.15% |
9.25% senior notes due January 2019 |  |
Long-term debt |  |
Senior Notes | 1,111,000 | 1,125,000
Interest rate on senior note due (as a percent) | 9.25% |
5.00% senior notes due September 2020 |  |
Long-term debt |  |
Senior Notes | 697,795 | 697,648
Interest rate on senior note due (as a percent) | 5.00% |
4.625% senior notes due September 2021 |  |
Long-term debt |  |
Senior Notes | 698,027 | 697,907
Interest rate on senior note due (as a percent) | 4.625% |
Revolving Credit Facility |  |
Long-term debt |  |
Revolving credit facility | 300,000 | 890,000
Commercial paper |  |
Long-term debt |  |
Long-term Debt | $ 295,000 |

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