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Debt Obligations (Details 1) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011
Schedule of principal payments of debt obligations |
Repurchase Amount | $ 109,724
Principal | 106,215
Loss | 3,264
Deferred Financing Amortization | 152
2011 3.75% Notes [Member] |
Schedule of principal payments of debt obligations |
Repurchase Amount | 59,835
Principal | 59,835
Loss | 0
Deferred Financing Amortization | 0
Debt instrument stated interest rate | 3.875%
2012 5.750% Notes [Member] |
Schedule of principal payments of debt obligations |
Repurchase Amount | 24,749
Principal | 23,709
Loss | 868
Deferred Financing Amortization | 32
Debt instrument stated interest rate | 5.75%
2015 7.500% Notes [Member] |
Schedule of principal payments of debt obligations |
Repurchase Amount | 25,140
Principal | 22,671
Loss | 2,396
Deferred Financing Amortization | $ 120
Debt instrument stated interest rate | 7.50%

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- Definition The cash outflow for the extinguishment of long-term borrowing, with the highest claim on the assets of the entity in case of bankruptcy or liquidation, before its maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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