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Debt (Details 3) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Carrying amount and estimated fair value of debt |  |  |  |
Debt, net | $ 1,927,703 |  | $ 2,019,168 |
Senior Notes |  |  |  |
Carrying amount and estimated fair value of debt |  |  |  |
Debt, net | 592,700 |  |  |
4.25% Exchangeable Senior Notes |  |  |  |
Carrying amount and estimated fair value of debt |  |  |  |
Debt, net | 563 | [1] | 230,934 | [1]
Carrying Amount |  |  |  |
Carrying amount and estimated fair value of debt |  |  |  |
Variable-rate debt | 657,691 |  | 838,032 |
Debt, net | 1,927,703 |  | 2,019,168 |
Carrying Amount | Senior Notes |  |  |  |
Carrying amount and estimated fair value of debt |  |  |  |
Fixed-rate debt | 592,689 |  | 0 |
Carrying Amount | 4.25% Exchangeable Senior Notes |  |  |  |
Carrying amount and estimated fair value of debt |  |  |  |
Fixed-rate debt | 563 |  | 230,934 |
Carrying Amount | Fixed-rate debt excluding other fixed rate debt not separately disclosed |  |  |  |
Carrying amount and estimated fair value of debt |  |  |  |
Fixed-rate debt | 676,760 |  | 950,202 |
Total Estimated Fair Value |  |  |  |
Carrying amount and estimated fair value of debt |  |  |  |
Variable-rate debt | 657,527 |  | 845,558 |
Debt, net | 1,884,473 |  | 2,054,020 |
Total Estimated Fair Value | Senior Notes |  |  |  |
Carrying amount and estimated fair value of debt |  |  |  |
Fixed-rate debt | 575,374 |  | 0 |
Total Estimated Fair Value | 4.25% Exchangeable Senior Notes |  |  |  |
Carrying amount and estimated fair value of debt |  |  |  |
Fixed-rate debt | 575 |  | 240,282 |
Total Estimated Fair Value | Fixed-rate debt excluding other fixed rate debt not separately disclosed |  |  |  |
Carrying amount and estimated fair value of debt |  |  |  |
Fixed-rate debt | $ 650,997 |  | $ 968,180 |
[1] | Refer to the paragraphs below for further disclosure.

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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 6: 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 + Details
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