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Other Assets (Tables)
 12 Months Ended
Dec. 31, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Other Assets
Other assets consist of the following (in thousands):
 
December 31,
 
2014
 
2013
Debt issuance costs, net of amortization(1)
$
56,445

 
$
61,923

Deferred tax asset
95,843

 
—

Restricted deposits(2)
—

 
27,955

Notes receivable on asset retirement obligations(2)
—

 
11,640

Investments
11,106

 
13,708

Other
1,853

 
5,945

Total other assets
$
165,247

 
$
121,171

____________________
(1)
Unamortized debt issuance costs associated with the 9.875% Senior Notes due 2016 and 8.0% Senior Notes due 2018 were written off in March 2013 when the Company redeemed these notes. See Note 12 for discussion of the senior note redemptions.
(2)
Assets at December 31, 2013 were included in the sale of the Gulf Properties in February 2014, as discussed in Note 3.