Accounts Receivable and Inventories

3 Months Ended

Mar. 31, 2019

Accounts receivable consist of the following:



(In thousands)	March 31 2019			December 31 2018
Trade accounts receivable	$	301,439		$	295,847
Less: Allowance for doubtful accounts	(4,644		)	(4,634		)
Trade accounts receivable, net	$	296,795		$	291,213

Other receivables (a)	$	51,130		$	54,182

(a) Other receivables include insurance claims, employee receivables, tax claims and other miscellaneous items not included in Trade accounts receivable, net.

The provision (benefit) for doubtful accounts related to trade accounts receivable was as follows:



	Three Months Ended
	March 31
(In thousands)	2019		2018
Provision (benefit) for doubtful accounts related to trade accounts receivable	$	26	$	(46	)

Inventories consist of the following:



(In thousands)	March 31 2019		December 31 2018
Finished goods	$	19,089	$	17,223
Work-in-process	21,715		21,787
Raw materials and purchased parts	82,983		72,194
Stores and supplies	23,909		21,907
Total inventories	$	147,696	$	133,111

The Company recognized an initial estimated forward loss provision related to the contracts with the federal railway system of Switzerland ("SBB") of $45.1 million for the year ended December 31, 2016. The Company recorded an additional forward loss provision of $1.8 million for the year ended December 31, 2018. At March 31, 2019, the entire remaining estimated forward loss provision of $6.8 million is included in the caption Other current liabilities on the Condensed Consolidated Balance Sheets. The estimated forward loss provision represents the Company's best estimate based on currently available information. It is possible that the Company's overall estimate of costs to complete these contracts may increase, which would result in an additional estimated forward loss provision at such time, but the Company is unable to estimate any further possible loss or range of loss at this time. There are a number of key events expected to occur in 2019, including the finalization of the manufacturing designs for certain of the vehicles, and which could affect the cost estimates. Any adjustment to the cost estimates would be recorded when new information becomes available and could have a material impact on the Company’s results of operations in that period.

The Company recognized $4.7 million and $7.9 million of revenues for the contracts with SBB at zero margin, on an over time basis, utilizing a cost-to-cost method for the three months ended March 31, 2019 and 2018, respectively. For the three months ended March 31, 2019 and 2018, consolidated product revenue gross margins were not significantly impacted by the revenue recognized under the SBB contracts. The Company has substantially completed the first contract and is approximately 30% complete on the second contract with SBB as of March 31, 2019.