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Secured and Unsecured Debt (Details 3) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Summary of unsecured debt |  |
Unsecured Debt, Total | $ 2,213,964 | $ 2,221,576
Unamortized discount | 5,700 | 6,700
4.63% Medium-Term Notes due January 2022 [Member] |  |
Summary of unsecured debt |  |
Senior Unsecured Notes | 397,656 | 397,477
Unamortized discount | 2,344 | 2,523
1.67% Term Notes due December 2016 [Member] |  |
Summary of unsecured debt |  |
Senior Unsecured Notes | 35,000 | 35,000
2.68% Term Notes due December 2016 [Member] |  |
Summary of unsecured debt |  |
Senior Unsecured Notes | 100,000 | 100,000
5.25% Medium-Term Notes due January 2015 [Member] |  |
Summary of unsecured debt |  |
Senior Unsecured Notes | 0 | 325,169
Unamortized discount | 0 | 6
5.25% Medium-Term Notes due January 2016 [Member] |  |
Summary of unsecured debt |  |
Senior Unsecured Notes | 83,260 | 83,260
2.90% Term Notes due January 2016 [Member] |  |
Summary of unsecured debt |  |
Senior Unsecured Notes | 215,000 | 215,000
8.50% Debentures due September 2024 [Member] |  |
Summary of unsecured debt |  |
Senior Unsecured Notes | 15,644 | 15,644
4.25% Medium-Term Notes due June 2018 [Member] |  |
Summary of unsecured debt |  |
Senior Unsecured Notes | 298,749 | 298,535
Unamortized discount | 1,251 | 1,465
Other [Member] |  |
Summary of unsecured debt |  |
Senior Unsecured Notes | $ 26 | $ 27

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- Definition The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Article 5 -Subsection 19, 20, 22 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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