Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Maintenance rights intangible and lease premium, net

v3.8.0.1
Maintenance rights intangible and lease premium, net
12 Months Ended
Dec. 31, 2017
Maintenance Rights Intangible And Lease Premium, Net [Abstract]  
Maintenance rights intangible and lease premium, net
Maintenance rights intangible and lease premium, net
Maintenance rights intangible and lease premium consisted of the following as of December 31, 2017 and 2016:
 
As of December 31,
 
2017
 
2016
Maintenance rights intangible
$
1,464,599

 
$
2,117,034

Lease premium, net
37,259

 
50,891

 
$
1,501,858

 
$
2,167,925


Movements in maintenance rights intangible during the years ended December 31, 2017 and 2016 were as follows:
 
Year Ended December 31,
 
2017
 
2016
Maintenance rights intangible at beginning of period
$
2,117,034

 
$
3,068,318

EOL and MR contract maintenance rights expense
(355,845
)
 
(381,637
)
MR contract maintenance rights write-off due to maintenance liability release
(77,494
)
 
(173,971
)
EOL contract maintenance rights write-off due to cash receipt
(106,433
)
 
(96,503
)
EOL and MR contract intangible write-off due to sale of aircraft
(112,663
)
 
(284,411
)
Transfer to other assets

 
(17,162
)
Additions due to aircraft acquisitions

 
2,400

Maintenance rights intangible at end of period
$
1,464,599

 
$
2,117,034



The following tables present details of lease premium and related accumulated amortization as of December 31, 2017 and 2016:
 
As of December 31, 2017
 
Gross carrying
amount
 
Accumulated
amortization
 
Net carrying
amount
Lease premium
$
77,977

 
$
(40,718
)
 
$
37,259

 
As of December 31, 2016
 
Gross carrying
amount
 
Accumulated
amortization
 
Net carrying
amount
Lease premium
$
94,959

 
$
(44,068
)
 
$
50,891


Lease premiums that are fully amortized are removed from the gross carrying amount and accumulated amortization columns in the tables above.
During the years ended December 31, 2017, 2016 and 2015, we recorded amortization expense for lease premium of $13.6 million, $19.8 million and $23.0 million, respectively.
As of December 31, 2017, the estimated future amortization expense for lease premium was as follows:
 
Estimated amortization
expense
2018
$
11,219

2019
10,466

2020
7,727

2021
5,394

2022
914

Thereafter
1,539

 
$
37,259