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Intangibles | 6 Months Ended
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Jun. 30, 2021
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, 2021 and December 31, 2020:
| June 30, 2021 |  | December 31, 2020
Maintenance rights | $ | 610,252 |  |  | $ | 642,825 |
Lease premium, net | 3,919 |  |  | 7,089 |
| $ | 614,171 |  |  | $ | 649,914 |
Movements in maintenance rights during the six months ended June 30, 2021 and 2020 were as follows:
| Six Months Ended June 30,
| 2021 |  | 2020
Maintenance rights at beginning of period | $ | 642,825 |  |  | $ | 794,798 |
EOL and MR contract maintenance rights expense | (6,170) |  |  | (28,078) |
MR contract maintenance rights write-off due to maintenance liability release | (7,340) |  |  | (1,841) |
EOL contract maintenance rights write-off due to cash receipt | (16,701) |  |  | (35,346) |
EOL and MR contract maintenance rights write-off due to sale of aircraft | (2,362) |  |  | (1,860) |
Maintenance rights at end of period | $ | 610,252 |  |  | $ | 727,673 |
Other intangibles Other intangibles consisted of the following as of June 30, 2021 and December 31, 2020:
| June 30, 2021 |  | December 31, 2020
Customer relationships, net | $ | 209,001 |  |  | $ | 219,589 |
Contractual vendor intangible assets | 5,045 |  |  | 5,045 |
| $ | 214,046 |  |  | $ | 224,634 |
The following tables present details of customer relationships and related accumulated amortization as of June 30, 2021 and December 31, 2020:
| June 30, 2021
| Gross carrying amount |  | Accumulated amortization |  | Net carrying amount
Customer relationships | $ | 360,000 |  |  | $ | (150,999) |  |  | $ | 209,001 |
| December 31, 2020
| Gross carrying amount |  | Accumulated amortization |  | Net carrying amount
Customer relationships | $ | 360,000 |  |  | $ | (140,411) |  |  | $ | 219,589 |
During the three months ended June 30, 2021 and 2020, we recorded amortization expense for customer relationships of $5.3 million. During the six months ended June 30, 2021 and 2020, we recorded amortization expense for customer relationships of $10.6 million.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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