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Other Assets (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |  |
Debt issuance costs, net of amortization | $ 83,643 | $ 51,724
Notes receivable on asset retirement obligations | 11,433 | 0
Investments | 10,348 | 7,138
Production tax credit receivable | 6,313 | 7,665
Lease broker advances | 0 | 13,086
Development advance | 0 | 16,777
Other | 4,568 | 2,232
Total other assets | $ 116,305 | $ 98,622

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