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Intangibles | 6 Months Ended
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Jun. 30, 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 June 30, 2019 and December 31, 2018:
| June 30, 2019 |  | December 31, 2018
Maintenance rights | $ | 938,452 |  |  | $ | 1,088,246 |
Lease premium, net | 19,755 |  |  | 24,944 |
| $ | 958,207 |  |  | $ | 1,113,190 |
Movements in maintenance rights during the six months ended June 30, 2019 and 2018 were as follows:
| Six Months Ended June 30,
| 2019 |  | 2018
Maintenance rights at beginning of period | $ | 1,088,246 |  |  | $ | 1,464,599 |
EOL and MR contract maintenance rights expense | (37,521 | ) |  | (89,427 | )
MR contract maintenance rights write-off due to maintenance liability release | (9,403 | ) |  | (11,971 | )
EOL contract maintenance rights write-off due to cash receipt | (97,343 | ) |  | (58,835 | )
EOL and MR contract maintenance rights write-off due to sale of aircraft | (5,527 | ) |  | (58,494 | )
Maintenance rights at end of period | $ | 938,452 |  |  | $ | 1,245,872 |
The following tables present details of lease premium and related accumulated amortization as of June 30, 2019 and December 31, 2018:
| June 30, 2019
| Gross carrying amount |  | Accumulated amortization |  | Net carrying amount
Lease premium | $ | 67,606 |  |  | $ | (47,851 | ) |  | $ | 19,755 |
| December 31, 2018
| Gross carrying amount |  | Accumulated amortization |  | Net carrying amount
Lease premium | $ | 73,300 |  |  | $ | (48,356 | ) |  | $ | 24,944 |
Lease premium amounts that are fully amortized are removed from the gross carrying amount and accumulated amortization columns in the tables above. During the three months ended June 30, 2019 and 2018, we recorded lease premium amortization expense of $2.6 million. During the six months ended June 30, 2019 and 2018, we recorded lease premium amortization expense of $5.2 million and $5.4 million, respectively. Other intangibles Other intangibles consisted of the following as of June 30, 2019 and December 31, 2018:
| June 30, 2019 |  | December 31, 2018
Goodwill | $ | 58,094 |  |  | $ | 58,094 |
Customer relationships, net | 251,353 |  |  | 261,941 |
Contractual vendor intangible assets | 8,535 |  |  | 8,535 |
| $ | 317,982 |  |  | $ | 328,570 |
The following tables present details of customer relationships and related accumulated amortization as of June 30, 2019 and December 31, 2018:
| June 30, 2019
| Gross carrying amount |  | Accumulated amortization |  | Net carrying amount
Customer relationships | $ | 360,000 |  |  | $ | (108,647 | ) |  | $ | 251,353 |
| December 31, 2018
| Gross carrying amount |  | Accumulated amortization |  | Net carrying amount
Customer relationships | $ | 360,000 |  |  | $ | (98,059 | ) |  | $ | 261,941 |
During the three months ended June 30, 2019 and 2018, we recorded amortization expense for customer relationships of $5.3 million. During the six months ended June 30, 2019 and 2018, we recorded amortization expense for customer relationships of $10.6 million. During the three and six months ended June 30, 2019 and 2018, we did not utilize any contractual vendor intangible assets to reduce the cash outlay related to purchases of goods and services from our vendors.

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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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