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Other Assets
6 Months Ended
Jun. 30, 2013
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Other Assets
Other Assets

Other assets consist of the following (in thousands):
 
June 30, 2013
 
December 31, 2012
Debt issuance costs, net of amortization
$
66,644

 
$
83,643

Restricted deposits
27,953

 
27,947

Notes receivable on asset retirement obligations
11,655

 
11,433

Investments
11,385

 
10,348

Production tax credit receivable
5,033

 
6,313

Other
2,088

 
4,568

Total other assets
$
124,758

 
$
144,252