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DEBT (Tables) | 3 Months Ended
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Mar. 31, 2013
Schedule of Debt Outstanding | Debt outstanding as of March 31, 2013 and December 31, 2012 consists of the following (in thousands):
|  | March 31, 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 March 31, 2013 and December 31, 2012 was 1.7%. |  | $ | 560,000 |  |  | $ | 655,000 |
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 issued with a $13.4 million discount, of which $8.1 million and $8.5 million was unamortized at March 31, 2013 and December 31, 2012, respectively. |  |  | 456,948 |  |  |  | 456,545 |
|  | $ | 1,016,948 |  |  | $ | 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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Namespace Prefix: | us-gaap_
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Period Type: | duration