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Debt Obligations (Outstanding Unsecured Notes in Series of Transactions) (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013
Extinguishment of Debt [Line Items] |  |
Repayments of unsecured notes | $ 120,361 | $ 13,027
Extinguishment of Debt, Amount | 117,755 |
2014 5.400% Notes |  |
Extinguishment of Debt [Line Items] |  |
Repayments of unsecured notes | 75,531 |
Extinguishment of Debt, Amount | 75,049 |
Gains (Losses) on Extinguishment of Debt, before Write off of Deferred Debt Issuance Cost | 527 |
Write off of Deferred Debt Issuance Cost | 5 |
2015 7.500% Notes |  |
Extinguishment of Debt [Line Items] |  |
Repayments of unsecured notes | 44,593 |
Extinguishment of Debt, Amount | 42,706 |
Gains (Losses) on Extinguishment of Debt, before Write off of Deferred Debt Issuance Cost | 2,079 |
Write off of Deferred Debt Issuance Cost | 41 |
Discharge of Debt [Member] |  |
Extinguishment of Debt [Line Items] |  |
Repayments of unsecured notes | 120,124 |
Extinguishment of Debt, Amount | 117,755 |
Gains (Losses) on Extinguishment of Debt, before Write off of Deferred Debt Issuance Cost | 2,606 |
Write off of Deferred Debt Issuance Cost | $ 46 |

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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=31042434&loc=d3e3291-108585 Reference 2: 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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- Definition Gross amount of debt extinguished. + References No definition available. + Details
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- Definition Reflects the difference between the fair value of payments made to legally extinguish a debt and its carrying value at that time. This item excludes the write-off of amounts previously capitalized as debt issuance costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12317-112629 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12355-112629 + Details
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- Definition Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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