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Intangibles
 6 Months Ended
Jun. 30, 2020
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, 2020 and December 31, 2019:
June 30, 2020December 31, 2019
Maintenance rights$727,673  $794,798  
Lease premium, net10,554  14,817  
$738,227  $809,615  
Movements in maintenance rights during the six months ended June 30, 2020 and 2019 were as follows:
Six Months Ended June 30,
20202019
Maintenance rights at beginning of period
$794,798  $1,088,246  
EOL and MR contract maintenance rights expense
(28,078) (37,521) 
MR contract maintenance rights write-off due to maintenance liability release
(1,841) (9,403) 
EOL contract maintenance rights write-off due to cash receipt
(35,346) (97,343) 
EOL and MR contract maintenance rights write-off due to sale of aircraft
(1,860) (5,527) 
Maintenance rights at end of period
$727,673  $938,452  
Other intangibles
Other intangibles consisted of the following as of June 30, 2020 and December 31, 2019:
June 30, 2020December 31, 2019
Goodwill$58,094  $58,094  
Customer relationships, net230,177  240,765  
Contractual vendor intangible assets5,045  8,535  
$293,316  $307,394  
The following tables present details of customer relationships and related accumulated amortization as of June 30, 2020 and December 31, 2019:
June 30, 2020
Gross carrying amountAccumulated
amortization		Net carrying amount
Customer relationships$360,000  $(129,823) $230,177  
December 31, 2019
Gross carrying amountAccumulated
amortization		Net carrying amount
Customer relationships$360,000  $(119,235) $240,765  
During the three months ended June 30, 2020 and 2019, we recorded amortization expense for customer relationships of $5.3 million. During the six months ended June 30, 2020 and 2019, we recorded amortization expense for customer relationships of $10.6 million.