
	Weighted Average Amortization Period (in Years)	As of December 31,
		2023		2022
Cost:
Customer acquisition costs	16 years	$	6,681	$	6,008
In-place lease contracts	21 years	819		819
Favorable rate revenue contracts	9 years	45,564		43,604
Favorable operation and maintenance contracts	4 years	60		135
Software in development	N/A	3,972		1,237
Other	5 years	112		55
Total intangible assets		57,208		51,858
Accumulated amortization:
Customer acquisition costs		(1,754)		(1,384)
In-place lease contracts		(241)		(201)
Favorable rate revenue contracts		(7,565)		(2,602)
Favorable operation and maintenance contracts		(60)		(44)
Total accumulated amortization		(9,620)		(4,231)
Total intangible assets, net		$	47,588	$	47,627


	Weighted Average Amortization Period (in Years)	As of December 31,
		2023		2022
Cost:
Unfavorable rate revenue contracts	5 years	$	29,306	$	19,215
Accumulated amortization:
Unfavorable rate revenue contracts		(10,361)		(6,804)
Total intangible liabilities, net		$	18,945	$	12,411

For the years ended December 31, 2023 and 2022, amortization expense was $5.4 million and $1.9 million, respectively, and was recorded in depreciation, amortization and accretion expense in the accompanying consolidated statements of operations.

For the years ended December 31, 2023 and 2022, amortization benefit was $3.6 million and $3.6 million, respectively, and was recorded in depreciation, amortization and accretion expense in the accompanying consolidated statements of operations.

Over the next five years, excluding any amortization expense related to software currently in development, the Company expects to recognize annual amortization on its intangibles as follows:


	2024		2025		2026		2027		2028
Favorable rate revenue contracts	$	4,850	$	4,642	$	4,584	$	4,584	$	3,415
In-place lease contracts	40		40		40		40		40
Customer acquisition costs	370		353		353		353		353
Unfavorable rate revenue contracts	(4,326)		(4,157)		(2,864)		(1,591)		(1,492)
Total net amortization expense	$	934	$	878	$	2,113	$	3,386	$	2,316