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Other assets
12 Months Ended
Dec. 31, 2018
Other Assets [Abstract]  
Other assets
Other assets
Other assets consisted of the following as of December 31, 2018 and 2017:
 
As of December 31,
 
2018
 
2017
Inventory
$
30,971

 
$
38,972

Debt issuance costs
36,814

 
43,241

Lease incentives
251,961

 
213,684

Other receivables
220,289

 
351,925

Investments (Note 10)
132,113

 
122,946

Notes receivables
58,994

 
22,497

Derivative assets (Note 11)
69,105

 
48,896

Other tangible fixed assets
29,151

 
31,114

Straight-line rents, prepaid expenses and other
79,792

 
106,655

 
$
909,190


$
979,930