Quarterly report pursuant to Section 13 or 15(d)

GOODWILL AND INTANGIBLE ASSETS

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GOODWILL AND INTANGIBLE ASSETS
9 Months Ended
Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
GOODWILL AND INTANGIBLE ASSETS GOODWILL AND INTANGIBLE ASSETS
Goodwill
The change in the carrying value of goodwill for the nine months ended September 30, 2021, was as follows (in thousands):
Balance as of December 31, 2020 $ 400,160 
Acquisition of Mountain Aviation 37,021 
Balance as of September 30, 2021 $ 437,181 
Intangible Assets
The gross carrying value, accumulated amortization and net carrying value of intangible assets consisted of the following (in thousands):
September 30, 2021
Gross Carrying
Value
Accumulated Amortization Net Carrying
Value
Status $ 80,000  $ 13,644  $ 66,356 
Customer relationships 74,600  12,478  62,122 
Non-competition agreement 210  181  29 
Trade name 14,230  4,739  9,491 
Developed technology 19,545  5,675  13,870 
Leasehold interest - favorable 600  52  548 
Total $ 189,185  $ 36,769  $ 152,416 
December 31, 2020
Gross Carrying
Value
Accumulated Amortization Net Carrying
Value
Status $ 80,000  $ 7,645  $ 72,355 
Customer relationships 70,000  6,609  63,391 
Non-competition agreement 100  100  — 
Trade name 13,900  2,487  11,413 
Developed technology 19,545  3,559  15,986 
Leasehold interest - favorable 600  35  565 
Total $ 184,145  $ 20,435  $ 163,710 
Amortization expense of intangible assets was $5.4 million and $16.0 million for the three and nine months ended September 30, 2021, respectively, and $5.2 million and $14.4 million for the three and nine months ended September 30, 2020, respectively.
Intangible Liabilities
The gross carrying value, accumulated amortization and net carrying value of intangible liabilities consisted of the following (in thousands):
September 30, 2021
Gross Carrying
Value
Accumulated Amortization Net Carrying
Value
Intangible liabilities $ 20,000  $ 3,417  $ 16,583 
December 31, 2020
Gross Carrying
Value
Accumulated Amortization Net Carrying
Value
Intangible liabilities $ 20,000  $ 1,917  $ 18,083 
Amortization of intangible liabilities, which reduces amortization expense was $0.5 million and $1.5 million for the three and nine months ended September 30, 2021, respectively, and $0.5 million and $1.4 million for the three and nine months ended September 30, 2020, respectively.
Future amortization expense of intangible assets and intangible liabilities held as of September 30, 2021 are as follows (in thousands):
Year ending December 31, Intangible Assets Intangible Liabilities
2021 $ 5,450  $ 500 
2022 20,124  2,000 
2023 19,864  2,000 
2024 19,701  2,000 
2025 19,288  2,000 
Thereafter 67,989  8,083 
Total $ 152,416  $ 16,583