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Debt (Tables) | 6 Months Ended
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Jun. 30, 2015
Debt Disclosure [Abstract] |
Debt Instrument Redemption | The Company had the following senior notes outstanding as of June 30, 2015:
Issue Date |  | Face Amount |  | Interest Rate |  | Maturity Date |  | Issue Price
May 2014 |  | $ | 250,000 |  |  | 4.40 | % |  | June 2024 |  | 99.883 | %
June 2013 |  | 250,000 |  |  | 4.25 | % |  | June 2023 |  | 99.026 | %
|  | $ | 500,000 |  |  |  |  |  |  |
Schedule of Long-term Debt Instruments | Below is a summary of additional disclosures related to the 6.00% Convertible Guaranteed Notes due 2030.
| 6.00% Convertible Guaranteed Notes due 2030
Balance Sheets: | June 30, 2015 |  | December 31, 2014
Principal amount of debt component | $ | 12,800 |  |  | $ | 16,228 |
Unamortized discount | (336 | ) |  | (564 | )
Carrying amount of debt component | $ | 12,464 |  |  | $ | 15,664 |
Carrying amount of equity component | $ | (34,681 | ) |  | $ | (33,160 | )
Effective interest rate | 7.6 | % |  | 8.1 | %
Period through which discount is being amortized, put date | 01/2017 |  |  | 01/2017 |
Aggregate if-converted value in excess of aggregate principal amount | $ | 3,655 |  |  | $ | 10,432 |
| Three months ended June 30, |  | Six months ended June 30,
Statements of Operations: | 2015 |  | 2014 |  | 2015 |  | 2014
6.00% Convertible Guaranteed Notes |  |  |  |  |  |  |
Coupon interest | $ | 156 |  |  | $ | 393 |  |  | $ | 392 |  |  | $ | 821 |
Discount amortization | 55 |  |  | 112 |  |  | 122 |  |  | 233 |
| $ | 211 |  |  | $ | 505 |  |  | $ | 514 |  |  | $ | 1,054 |

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- Definition Tabular disclosure of debt instruments or arrangements with redemption features. Includes, but is not limited to, description of debt redemption features, percentage price at which debt can be redeemed by the issuer, and period start and end for debt maturity or redemption. + References No definition available. + Details
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- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: 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 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21538-112644 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 Reference 8: 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 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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