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Debt (Tables) | 9 Months Ended
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Sep. 30, 2013
Schedule of Debt Outstanding | Debt outstanding as of September 30, 2013 and December 31, 2012 consists of the following (in thousands):
|  | September 30, 2013 |  |  | December 31, 2012 |
Revolving Credit Facility, principal due at maturity in December 2017; interest payable periodically at variable interest rates. The weighted average rate at both September 30, 2013 and December 31, 2012 was 1.7%. |  | $ | 510,000 |  |  | $ | 655,000 |
4.625% Senior Notes, principal due at maturity in May 2023; interest payable semi-annually in May and November at 4.625%. |  |  | 350,000 |  |  |  | — |
4.125% Senior Notes, principal due at maturity in April 2020; interest payable semi-annually in April and October at 4.125%. |  |  | 325,000 |  |  |  | — |
7.75% Senior Notes, principal due at maturity in June 2017; interest payable semi-annually in June and December at 7.75%. These notes were redeemed during 2013 as further described hereafter. |  |  | — |  |  |  | 456,545 |
|  | $ | 1,185,000 |  |  | $ | 1,111,545 |

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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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