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Intangibles | 12 Months Ended
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Dec. 31, 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 December 31, 2020 and 2019:
| As of December 31,
| 2020 |  | 2019
Maintenance rights | $ | 642,825 |  |  | $ | 794,798 |
Lease premium, net | 7,089 |  |  | 14,817 |
| $ | 649,914 |  |  | $ | 809,615 |
Movements in maintenance rights during the years ended December 31, 2020 and 2019 were as follows:
| Year Ended December 31,
| 2020 |  | 2019
Maintenance rights at beginning of period | $ | 794,798 |  |  | $ | 1,088,246 |
EOL and MR contract maintenance rights expense | (45,655) |  |  | (76,611) |
MR contract maintenance rights write-off due to maintenance liability release | (35,897) |  |  | (19,848) |
EOL contract maintenance rights write-off due to cash receipt | (51,463) |  |  | (148,289) |
EOL and MR contract maintenance rights write-off due to sale of aircraft and impairment | (18,958) |  |  | (48,700) |
Maintenance rights at end of period | $ | 642,825 |  |  | $ | 794,798 |
Other intangibles Other intangibles consisted of the following as of December 31, 2020 and 2019:
| As of December 31,
| 2020 |  | 2019
Goodwill (Note 22) | $ | — |  |  | $ | 58,094 |
Customer relationships, net | 219,589 |  |  | 240,765 |
Contractual vendor intangible assets | 5,045 |  |  | 8,535 |
| $ | 224,634 |  |  | $ | 307,394 |
The following tables present details of customer relationships and related accumulated amortization as of December 31, 2020 and 2019:
| As of December 31, 2020
| Gross carrying amount |  | Accumulated amortization |  | Net carrying amount
Customer relationships | $ | 360,000 |  |  | $ | (140,411) |  |  | $ | 219,589 |
| As of December 31, 2019
| Gross carrying amount |  | Accumulated amortization |  | Net carrying amount
Customer relationships | $ | 360,000 |  |  | $ | (119,235) |  |  | $ | 240,765 |
During the years ended December 31, 2020, 2019 and 2018, we recorded annual amortization expense for customer relationships of $21.2 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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