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Convertible Notes, Exchangeble Notes and Trust Preferred Securities (Tables) | 12 Months Ended
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Dec. 31, 2012
Debt Instrument [Line Items] |
Schedule of Long-term Debt Instruments [Table Text Block] | Below is a summary of additional disclosures related to the 6.00% Convertible Guaranteed Notes and the 5.45% Exchangeable Guaranteed Notes.
| 6.00% Convertible Guaranteed Notes |  | 5.45% Exchangeable Guaranteed Notes
Balance Sheets: | December 31, 2012 |  | December 31, 2011 |  | December 31, 2012 |  | December 31, 2011
Principal amount of debt component | $ | 83,896 |  |  | $ | 115,000 |  |  | $ | — |  |  | $ | 62,150 |
Unamortized discount | (5,769 | ) |  | (9,851 | ) |  | — |  |  | (48 | )
Carrying amount of debt component | $ | 78,127 |  |  | $ | 105,149 |  |  | $ | — |  |  | $ | 62,102 |
Carrying amount of equity component | $ | 3,654 |  |  | $ | 13,134 |  |  | $ | — |  |  | $ | 20,293 |
Effective interest rate | 8.1 | % |  | 8.1 | % |  | — | % |  | 7.0 | %
Period through which discount is being amortized, put date | 01/2017 |  |  | 01/2017 |  |  | — |  |  | 01/2012 |
Aggregate if-converted value in excess of aggregate principal amount | $ | 42,579 |  |  | $ | 7,907 |  |  | $ | — |  |  | $ | — |
Statements of Operations: |  | 2012 |  | 2011 |  | 2010
6.00% Convertible Guaranteed Notes |  |  |  |  |  |
Coupon interest |  | $ | 6,634 |  |  | $ | 6,900 |  |  | $ | 6,408 |
Discount amortization |  | 1,868 |  |  | 1,938 |  |  | 1,776 |
|  | $ | 8,502 |  |  | $ | 8,838 |  |  | $ | 8,184 |
5.45% Exchangeable Guaranteed Notes |  |  |  |  |  |  |  |  |
Coupon interest |  | $ | 188 |  |  | $ | 3,387 |  |  | $ | 3,504 |
Discount amortization |  | 34 |  |  | 664 |  |  | 689 |
|  | $ | 222 |  |  | $ | 4,051 |  |  | $ | 4,193 |
Convertible Notes, Exchangeable Notes, and Trust Preferred Securities [Member] |
Debt Instrument [Line Items] |
Schedule of Maturities of Long-term Debt [Table Text Block] | Scheduled principal payments for these debt instruments for the next five years and thereafter are as follows:
Year ending December 31, |  | Total
2013 |  | $ | — |
2014 |  | — |
2015 |  | — |
2016 |  | — |
2017(1) |  | 83,896 |
Thereafter |  | 129,120 |
|  | 213,016 |
Debt discount |  | (5,769 | )
|  | $ | 207,247 |
(1) | Although the 6.00% Convertible Guaranteed Notes mature in 2030, the notes can be put to the Company in 2017. See note 22 for subsequent events.

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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 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21538-112644 Reference 2: 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=6881521&loc=d3e23780-122690 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 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 Reference 5: 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 6: 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 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 8: 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 9: 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 10: 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 11: 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 + Details
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- Definition Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 470 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph -Name Accounting Standards Codification -Paragraph 1 -Section 50 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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