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Other Assets (Tables)
 9 Months Ended
Sep. 30, 2015
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Other Assets
Other assets consist of the following (in thousands):
 
September 30,
2015
 
December 31,
2014
Debt issuance costs, net of amortization
$
80,566

 
$
56,445

Deferred tax asset
51,126

 
95,843

Investments
10,444

 
11,106

Other
614

 
1,853

Total other assets
$
142,750

 
$
165,247