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Debt Debt (Tables) | 6 Months Ended
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Jun. 30, 2013
Debt Disclosure [Abstract] |
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
Balance Sheets: | June 30, 2013 |  | December 31, 2012
Principal amount of debt component | $ | 41,146 |  |  | $ | 83,896 |
Unamortized discount | (2,480 | ) |  | (5,769 | )
Carrying amount of debt component | $ | 38,666 |  |  | $ | 78,127 |
Carrying amount of equity component | $ | (16,677 | ) |  | $ | 3,654 |
Effective interest rate | 8.1 | % |  | 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 | $ | 29,135 |  |  | $ | 42,579 |
| Three months ended June 30, |  | Six months ended June 30,
Statements of Operations: | 2013 |  | 2012 |  | 2013 |  | 2012
6.00% Convertible Guaranteed Notes |  |  |  |  |  |  |
Coupon interest | $ | 610 |  |  | $ | 1,725 |  |  | $ | 1,398 |  |  | $ | 3,450 |
Discount amortization | 175 |  |  | 484 |  |  | 398 |  |  | 969 |
| $ | 785 |  |  | $ | 2,209 |  |  | $ | 1,796 |  |  | $ | 4,419 |

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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 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 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=6584090&loc=d3e28878-108400 Reference 3: 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 4: 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 5: 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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 7: 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 8: 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 9: 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 10: 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 11: 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 + Details
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