Supplemental Balance Sheet Information - Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance, at beginning of year	$ 19,307	$ 3,441	$ 2,953
Bad debt expense	6,369	21,911	1,043
Write-offs and adjustments	(11,152)	(6,045)	(555)
Balance, at beginning of year	14,524	19,307	$ 3,441
Corrosion Protection
Allowance for Doubtful Accounts Receivable [Roll Forward]
Bad debt expense	2,900
Infrastructure Solutions
Allowance for Doubtful Accounts Receivable [Roll Forward]
Bad debt expense	7,500	7,500
Restructuring Plan 2014
Allowance for Doubtful Accounts Receivable [Roll Forward]
Bad debt expense	$ 1,200	$ 11,900