Accounts receivable trade, net consisted of the following at March 31, 2023 and December 31, 2022 (in thousands):


	March 31, 2023		December 31, 2022
Accounts receivable trade, gross	$	299,628	$	325,379
Allowance for credit losses	(1,008)		(1,042)
Accounts receivable trade, net	$	298,620	$	324,337

The following table presents the change in the allowance for credit losses related to our trade accounts receivable for the three months ended March 31, 2023 and 2022 (in thousands):


	Three Months Ended March 31,
	2023		2022
Allowance for credit losses, beginning of period	$	1,042	$	664
Provision for credit losses, net	(34)		(185)
Allowance for credit losses, end of period	$	1,008	$	479

Inventories consisted of the following at March 31, 2023 and December 31, 2022 (in thousands):


	March 31, 2023		December 31, 2022
Raw materials	$	403,225	$	397,912
Work in process	75,731		66,641
Finished goods	525,804		417,218
Inventories	$	1,004,760	$	881,771
Inventories – current	$	751,407	$	621,376
Inventories – noncurrent	$	253,353	$	260,395

Other current assets consisted of the following at March 31, 2023 and December 31, 2022 (in thousands):


	March 31, 2023		December 31, 2022
Spare maintenance materials and parts	$	120,542	$	114,428
Operating supplies	59,697		47,492
Prepaid expenses	45,470		43,262
Prepaid income taxes	12,325		8,314
Restricted cash	12,256		3,175
Derivative instruments (1)	2,690		2,018
Other	19,722		18,384
Other current assets	$	272,702	$	237,073

(1)See Note 7. “Derivative Financial Instruments” to our condensed consolidated financial statements for discussion of our derivative instruments.

Property, plant and equipment, net consisted of the following at March 31, 2023 and December 31, 2022 (in thousands):


	March 31, 2023		December 31, 2022
Land	$	35,305	$	35,259
Buildings and improvements	1,009,652		893,049
Machinery and equipment	2,803,499		2,762,801
Office equipment and furniture	155,321		146,467
Leasehold improvements	40,077		40,160
Construction in progress	1,343,541		1,121,938
Property, plant and equipment, gross	5,387,395		4,999,674
Accumulated depreciation	(1,528,791)		(1,462,772)
Property, plant and equipment, net	$	3,858,604	$	3,536,902

Depreciation of property, plant and equipment was $65.9 million and $58.6 million for the three months ended March 31, 2023 and 2022, respectively.

Goodwill for the relevant reporting unit consisted of the following at March 31, 2023 and December 31, 2022 (in thousands):


	December 31, 2022		Acquisitions (Impairments)		March 31, 2023
Modules	$	407,827	$	—	$	407,827
Accumulated impairment losses	(393,365)		—		(393,365)
Goodwill	$	14,462	$	—	$	14,462

Intangible assets, net consisted of the following at March 31, 2023 and December 31, 2022 (in thousands):


	March 31, 2023
	Gross Amount		Accumulated Amortization		Net Amount
Developed technology	$	97,347	$	(71,150)	$	26,197
Patents	8,970		(6,690)		2,280
Intangible assets, net	$	106,317	$	(77,840)	$	28,477


	December 31, 2022
	Gross Amount		Accumulated Amortization		Net Amount
Developed technology	$	97,347	$	(68,650)	$	28,697
Patents	8,970		(6,561)		2,409
Intangible assets, net	$	106,317	$	(75,211)	$	31,106

Amortization of intangible assets was $2.6 million and $2.7 million for the three months ended March 31, 2023 and 2022.

Other assets consisted of the following at March 31, 2023 and December 31, 2022 (in thousands):


	March 31, 2023		December 31, 2022
Advance payments for raw materials	$	137,860	$	91,260
Operating lease assets (1)	91,282		93,185
Income tax receivables	56,993		56,993
Project assets	30,397		30,108
Accounts receivable unbilled, net	10,111		11,498
Restricted cash equivalents	2,579		6,284
Restricted cash	1,349		2,734
Accounts receivable trade, net	—		1,500
Other	56,149		62,630
Other assets	$	386,720	$	356,192

(1)See Note 8. “Leases” to our condensed consolidated financial statements for discussion of our lease arrangements.

Accrued expenses consisted of the following at March 31, 2023 and December 31, 2022 (in thousands):


	March 31, 2023		December 31, 2022
Accrued property, plant and equipment	$	193,399	$	148,777
Accrued freight	69,090		77,136
Accrued inventory	54,463		44,679
Accrued compensation and benefits	17,339		47,939
Accrued other taxes	12,862		19,765
Product warranty liability (1)	10,236		10,660
Other	34,523		33,826
Accrued expenses	$	391,912	$	382,782

(1)See Note 11. “Commitments and Contingencies” to our condensed consolidated financial statements for discussion of our “Product Warranties.”

Other current liabilities consisted of the following at March 31, 2023 and December 31, 2022 (in thousands):


	March 31, 2023		December 31, 2022
Operating lease liabilities (1)	$	9,363	$	9,193
Derivative instruments (2)	6,797		6,668
Other taxes payable	1,180		1,185
Other	3,291		4,199
Other current liabilities	$	20,631	$	21,245

(1)See Note 8. “Leases” to our condensed consolidated financial statements for discussion of our lease arrangements.

(2)See Note 7. “Derivative Financial Instruments” to our condensed consolidated financial statements for discussion of our derivative instruments.

Other liabilities consisted of the following at March 31, 2023 and December 31, 2022 (in thousands):


	March 31, 2023		December 31, 2022
Operating lease liabilities (1)	$	38,473	$	40,589
Deferred tax liabilities, net	32,500		28,929
Product warranty liability (2)	23,079		23,127
Other	27,320		27,292
Other liabilities	$	121,372	$	119,937

(1)See Note 8. “Leases” to our condensed consolidated financial statements for discussion of our lease arrangements.

(2)See Note 11. “Commitments and Contingencies” to our condensed consolidated financial statements for discussion of our “Product Warranties.”