The following is a summary of fixed assets as of December 31, 2021 and 2020 (in thousands):


	December 31,
	2021			2020
Office equipment	$	354,292		$	323,841
Leasehold improvements		113,576			105,187
Building		65,327			62,803
		533,195			491,831
Accumulated depreciation and amortization		(364,989	)		(323,916	)
	$	168,206		$	167,915

For the years ended December 31, 2021, 2020, and 2019, depreciation and amortization totaled $45.6 million, $40.9 million, and $38.4 million, respectively.

In July 2021, the Company purchased three commercial aircraft under lease to a domestic carrier, for a total purchase price of $145.9 million. In December 2021, the Company sold the aircraft with a net book value of $143.9 million and recognized a gain from the sale of $4.5 million, which is included in other income in the consolidated statement of operations. Lease income, included in other income in the consolidated statements of operations, was $4.9 million for year ended December 31, 2021.