Restructuring Activities

Summary of 2017 Restructuring Plan

In November 2017, management approved and commenced a restructuring plan that was intended to increase operating efficiencies. We have recorded cumulative expenses of $23.6 million through December 31, 2018, with $8.8 million recorded during 2017.

In the Electronic Systems segment, we have recorded $2.6 million during 2018 and cumulative expenses of $3.8 million for severance and benefits which were classified as restructuring charges. We recorded during 2018 and on a cumulative basis, expenses of $0.9 million for loss on early exit from lease termination which was classified as restructuring charges. We also recorded during 2018 and on a cumulative basis, other expenses of $0.9 million which were classified as restructuring charges. In addition, we recorded during 2018 and on a cumulative basis, expenses of $0.2 million for professional service fees which were classified as restructuring charges. Further, we recorded during 2018 and on a cumulative basis, non-cash expenses of $0.1 million for inventory write down which were classified as cost of sales. Finally, we recorded during 2018 and on a cumulative basis, non-cash expenses of $0.1 million for property and equipment impairment which were classified as restructuring charges.

In the Structural Systems segment, we have recorded $1.3 million during 2018 and cumulative expenses of $3.0 million for severance and benefits which were classified as restructuring charges. We recorded $6.2 million during 2018 and on a cumulative basis, non-cash expenses of $9.8 million for property and equipment impairment which were classified as restructuring charges. We also recorded during 2018 and on a cumulative basis, non-cash expenses of $0.5 million for inventory write down which were classified as cost of sales. In addition, we recorded during 2018 and on a cumulative basis, other expenses of $0.4 million which were classified as restructuring charges.

In Corporate, we have recorded $1.0 million during 2018 and cumulative expenses of $1.4 million for severance and benefits which was classified as restructuring charges. We recorded $0.1 million during 2018 and on a cumulative basis, non-cash expenses of $1.4 million for stock-based compensation awards which were modified, all of which were classified as restructuring charges. In addition, we recorded during 2018 and on a cumulative basis, expenses of $1.0 million for professional service fees which were classified as restructuring charges.

As of December 31, 2018, we have accrued $2.8 million, $0.9 million, and $0.3 million for severance and benefits, professional service fees, and loss on early exit from lease in the Electronic Systems segment, Structural Systems segment, and Corporate, respectively.

Our restructuring activities for 2018 and 2017 were as follows (in thousands):



	December 31, 2017		2018											December 31, 2018
	Balance		Charges		Cash Payments			Non-Cash Payments			Change in Estimates			Balance
Severance and benefits	$	2,659	$	5,018	$	(4,346	)	$	—		$	(700	)	$	2,631
Modification of stock-based compensation awards	—		105		—			(105		)	—			—
Lease termination	66		864		(69		)	—			—			861
Property and equipment impairment due to restructuring	—		6,207		—			(6,207		)	—			—
Professional service fees	—		1,165		(1,122		)	—			—			43
Other	—		1,312		(896		)	—			—			416
Total charged to restructuring charges	2,725		14,671		(6,433		)	(6,312		)	(700		)	3,951
Inventory reserve	—		121		—			—			(71		)	50
Total charged to cost of sales	—		121		—			—			(71		)	50
Ending balance	$	2,725	$	14,792	$	(6,433	)	$	(6,312	)	$	(771	)	$	4,001