Supplemental Balance Sheet Information (Tables)

12 Months Ended

Dec. 31, 2016

Supplemental Balance Sheet Data [Abstract]

Allowance for Doubtful Accounts

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

	Years Ended December 31,
	2016			2015			2014
Balance, at beginning of year	$	14,524		$	19,307		$	3,441
Bad debt expense (1)(2)	1,083			6,369			21,911
Write-offs and adjustments (1)(2)	(9,509		)	(11,152		)	(6,045		)
Balance, at end of year (3)	$	6,098		$	14,524		$	19,307

__________________________

⁽¹⁾  The Company recorded bad debt expense (reversals) of $(0.6) million, $1.2 million and $11.9 million in 2016, 2015 and 2014, respectively, as part of the 2014 Restructuring (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 the Corrosion Protection segment.

⁽³⁾  December 31, 2015 and 2014 balances include $7.5 million related to long-dated receivables, some of which were in litigation or dispute, within the Infrastructure Solutions segment.

Costs in Excess of Billings and Billings in Excess of Costs

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

	December 31,
	2016			2015
Costs incurred on uncompleted contracts	$	741,590		$	818,008
Estimated earnings to date	165,862			159,321
Subtotal	907,452			977,329
Less – billings to date	(907,749		)	(975,663		)
Total	$	(297	)	$	1,666
Included in the accompanying balance sheets:
Costs and estimated earnings in excess of billings	62,401			89,141
Billings in excess of costs and estimated earnings	(62,698		)	(87,475		)
Total	$	(297	)	$	1,666

Schedule of Inventory

Inventories are summarized as follows (in thousands):

	December 31,
	2016		2015
Raw materials and supplies	$	31,399	$	23,467
Work-in-process	2,207		3,612
Finished products	14,015		6,789
Construction materials	16,332		13,911
Total	$	63,953	$	47,779

Property, Plant and Equipment

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

	Estimated Useful Lives (Years)			December 31,
				2016			2015
Land and land improvements				$	10,414		$	10,348
Buildings and improvements	5	—	40	65,505			55,981
Machinery and equipment	4	—	10	189,849			173,898
Furniture and fixtures	3	—	10	32,386			30,048
Autos and trucks	3	—	10	50,128			50,200
Construction in progress				9,944			11,661
Subtotal				358,226			332,136
Less – Accumulated depreciation				(201,479		)	(187,303		)
Total				$	156,747		$	144,833

Schedule of Accrued Liabilities

Accrued expenses consisted of the following (in thousands):

	December 31,
	2016		2015
Vendor and other accrued expenses	$	33,108	$	56,570
Estimated casualty and healthcare liabilities	14,610		15,255
Job costs	8,707		12,403
Accrued compensation	23,398		22,184
Income tax payable and deferred income taxes	5,187		6,539
Total	$	85,010	$	112,951