Supplemental Balance Sheet Information (Tables)

12 Months Ended

Dec. 31, 2017

Activity in the allowance for doubtful accounts is summarized as follows (in thousands):

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⁽¹⁾	The Company recorded bad debt expense (reversals) of $0.4 million, $(0.6) million and $1.2 million in 2017, 2016 and 2015, respectively, as part of the restructuring efforts (see Note 3) and was primarily due to the exiting of certain low-return businesses mainly in foreign locations.


⁽²⁾	The Company recorded bad debt expense of $2.9 million in 2015 related to long-dated receivables within Corrosion Protection.


⁽³⁾	December 31, 2015 balance includes $7.5 million related to long-dated receivables, some of which were in litigation or dispute, within Infrastructure Solutions.

Costs and estimated earnings on uncompleted contracts consisted of the following (in thousands):



	December 31,
	2017			2016
Costs incurred on uncompleted contracts	$	751,399		$	741,590
Estimated earnings to date	138,998			165,862
Subtotal	890,397			907,452
Less – billings to date	(866,623		)	(907,749		)
Total	$	23,774		$	(297	)
Included in the accompanying balance sheets:
Costs and estimated earnings in excess of billings	$	75,371		$	62,401
Billings in excess of costs and estimated earnings	(51,597		)	(62,698		)
Total	$	23,774		$	(297	)

Inventories are summarized as follows (in thousands):

Property, plant and equipment consisted of the following (in thousands):



	Estimated Useful Lives (Years)			December 31,
	Estimated Useful Lives (Years)			2017			2016
Land and land improvements				$	10,258		$	10,414
Buildings and improvements	5	—	40	47,725			65,505
Machinery and equipment	4	—	10	159,626			189,849
Furniture and fixtures	3	—	10	35,149			32,386
Autos and trucks	3	—	10	54,039			50,128
Construction in progress				8,424			9,944
Subtotal				315,221			358,226
Less – Accumulated depreciation				(206,181		)	(201,479		)
Total				$	109,040		$	156,747

Accrued expenses consisted of the following (in thousands):



	December 31,
	2017		2016
Vendor and other accrued expenses	$	35,193	$	33,108
Estimated casualty and healthcare liabilities	14,772		14,610
Job costs	9,585		8,707
Accrued compensation	27,901		23,398
Income taxes payable	4,560		1,870
Deferred income taxes ⁽¹⁾	—		3,317
Total	$	92,011	$	85,010

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⁽¹⁾	As of January 1, 2017, the Company adopted FASB Accounting Standards Update No. 2015-17, Balance Sheet Classification of Deferred Taxes, which requires all deferred tax assets and liabilities, along with any related valuation allowance, to be presented as non-current. Prior period balances were not retrospectively adjusted.