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Intangibles
 6 Months Ended
Jun. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangibles Intangibles
Maintenance rights and lease premium, net
Maintenance rights and lease premium, net consisted of the following as of June 30, 2019 and December 31, 2018:
 
June 30, 2019
 
December 31, 2018
Maintenance rights
$
938,452

 
$
1,088,246

Lease premium, net
19,755

 
24,944

 
$
958,207

 
$
1,113,190


Movements in maintenance rights during the six months ended June 30, 2019 and 2018 were as follows:
 
Six Months Ended June 30,
 
2019
 
2018
Maintenance rights at beginning of period
$
1,088,246

 
$
1,464,599

EOL and MR contract maintenance rights expense
(37,521
)
 
(89,427
)
MR contract maintenance rights write-off due to maintenance liability release
(9,403
)
 
(11,971
)
EOL contract maintenance rights write-off due to cash receipt
(97,343
)
 
(58,835
)
EOL and MR contract maintenance rights write-off due to sale of aircraft
(5,527
)
 
(58,494
)
Maintenance rights at end of period
$
938,452

 
$
1,245,872


The following tables present details of lease premium and related accumulated amortization as of June 30, 2019 and December 31, 2018:
 
June 30, 2019
 
Gross carrying amount
 
Accumulated
amortization
 
Net carrying amount
Lease premium
$
67,606

 
$
(47,851
)
 
$
19,755

 
 
 
 
 
 
 
December 31, 2018
 
Gross carrying amount
 
Accumulated
amortization
 
Net carrying amount
Lease premium
$
73,300

 
$
(48,356
)
 
$
24,944


Lease premium amounts that are fully amortized are removed from the gross carrying amount and accumulated amortization columns in the tables above.
During the three months ended June 30, 2019 and 2018, we recorded lease premium amortization expense of $2.6 million. During the six months ended June 30, 2019 and 2018, we recorded lease premium amortization expense of $5.2 million and $5.4 million, respectively.
Other intangibles
Other intangibles consisted of the following as of June 30, 2019 and December 31, 2018:
 
June 30, 2019
 
December 31, 2018
Goodwill
$
58,094

 
$
58,094

Customer relationships, net
251,353

 
261,941

Contractual vendor intangible assets
8,535

 
8,535

 
$
317,982

 
$
328,570


The following tables present details of customer relationships and related accumulated amortization as of June 30, 2019 and December 31, 2018:
 
June 30, 2019
 
Gross carrying amount
 
Accumulated
amortization
 
Net carrying amount
Customer relationships
$
360,000

 
$
(108,647
)
 
$
251,353

 
 
 
 
 
 
 
December 31, 2018
 
Gross carrying amount
 
Accumulated
amortization
 
Net carrying amount
Customer relationships
$
360,000

 
$
(98,059
)
 
$
261,941


During the three months ended June 30, 2019 and 2018, we recorded amortization expense for customer relationships of $5.3 million. During the six months ended June 30, 2019 and 2018, we recorded amortization expense for customer relationships of $10.6 million.
During the three and six months ended June 30, 2019 and 2018, we did not utilize any contractual vendor intangible assets to reduce the cash outlay related to purchases of goods and services from our vendors.