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Intangibles | 6 Months Ended
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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, 2020 |  | December 31, 2019
Maintenance rights | $ | 727,673 |  |  | $ | 794,798 |
Lease premium, net | 10,554 |  |  | 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, |  |
| 2020 |  | 2019
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, 2020 |  | December 31, 2019
Goodwill | $ | 58,094 |  |  | $ | 58,094 |
Customer relationships, net | 230,177 |  |  | 240,765 |
Contractual vendor intangible assets | 5,045 |  |  | 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 amount |  | Accumulated amortization |  | Net carrying amount
Customer relationships | $ | 360,000 |  |  | $ | (129,823) |  |  | $ | 230,177 |
| December 31, 2019 |  |  |  |
| Gross carrying amount |  | Accumulated 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.

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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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