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Other Assets
12 Months Ended
Dec. 31, 2012
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Other Assets
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