Discontinued Operations and Divestitures (Summary of Cash Proceeds from Disposlas) (Details) - USD ($) $ in Thousands			12 Months Ended
	Dec. 13, 2019	Aug. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sale proceeds from divestiture, net of cash divested and liabilities assumed by buyer			$ 79,796	$ 0	$ 7,883
Discontinued Operations, Disposed of by Sale | North American Fiber Solutions
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Base purchase price		$ 85,000
Less: contingent purchase price not earned		(5,000)
Less: debt and pension liabilities assumed by the Motus Group		(2,206)
Less: income tax allocation due to buyer		(560)
Plus: preliminary working capital surplus		5
Plus: cash at closing		1,394
Adjusted purchase price		78,633
Less: cash divested		3,894
Less: consideration held in escrow and closing balance sheet adjustments		(282)
Sale proceeds from divestiture, net of cash divested and liabilities assumed by buyer		$ 75,021
Discontinued Operations, Disposed of by Sale | Metalex
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Base purchase price	$ 5,000
Less: income tax allocation due to buyer	(139)
Plus: preliminary working capital surplus	570
Plus: cash at closing	229
Adjusted purchase price	5,938
Less: cash divested	229
Less: consideration held in escrow and closing balance sheet adjustments	934
Sale proceeds from divestiture, net of cash divested and liabilities assumed by buyer	$ 4,775