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Other Assets (Tables) | 12 Months Ended
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Dec. 31, 2012
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |
Other Assets | Other assets consist of the following (in thousands):
| December 31,
| 2012 |  | 2011
Debt issuance costs, net of amortization | $ | 83,643 |  |  | $ | 51,724 |
Notes receivable on asset retirement obligations | 11,433 |  |  | — |
Investments | 10,348 |  |  | 7,138 |
Production tax credit receivable | 6,313 |  |  | 7,665 |
Lease broker advances | — |  |  | 13,086 |
Development advance | — |  |  | 16,777 |
Other | 4,568 |  |  | 2,232 |
Total other assets | $ | 116,305 |  |  | $ | 98,622 |

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- Definition Tabular disclosure of noncurrent assets. + 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 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 + Details
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