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Intangibles | 12 Months Ended
--- | ---
Dec. 31, 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 December 31, 2019 and 2018:
| As of December 31,
| 2019 |  | 2018
Maintenance rights | $ | 794,798 |  |  | $ | 1,088,246 |
Lease premium, net | 14,817 |  |  | 24,944 |
| $ | 809,615 |  |  | $ | 1,113,190 |
Movements in maintenance rights during the years ended December 31, 2019 and 2018 were as follows:
| Year Ended December 31,
| 2019 |  | 2018
Maintenance rights at beginning of period | $ | 1,088,246 |  |  | $ | 1,464,599 |
EOL and MR contract maintenance rights expense | (76,611 | ) |  | (157,792 | )
MR contract maintenance rights write-off due to maintenance liability release | (19,848 | ) |  | (29,656 | )
EOL contract maintenance rights write-off due to cash receipt | (148,289 | ) |  | (99,671 | )
EOL and MR contract maintenance rights write-off due to sale of aircraft | (48,700 | ) |  | (89,234 | )
Maintenance rights at end of period | $ | 794,798 |  |  | $ | 1,088,246 |
Other intangibles Other intangibles consisted of the following as of December 31, 2019 and 2018:
| As of December 31,
| 2019 |  | 2018
Goodwill | $ | 58,094 |  |  | $ | 58,094 |
Customer relationships, net | 240,765 |  |  | 261,941 |
Contractual vendor intangible assets | 8,535 |  |  | 8,535 |
| $ | 307,394 |  |  | $ | 328,570 |
The following tables present details of customer relationships and related accumulated amortization as of December 31, 2019 and 2018:
| As of December 31, 2019
| Gross carrying amount |  | Accumulated amortization |  | Net carrying amount
Customer relationships | $ | 360,000 |  |  | $ | (119,235 | ) |  | $ | 240,765 |
| As of December 31, 2018
| Gross carrying amount |  | Accumulated amortization |  | Net carrying amount
Customer relationships | $ | 360,000 |  |  | $ | (98,059 | ) |  | $ | 261,941 |
During the years ended December 31, 2019, 2018 and 2017, 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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