Discontinued Operations and Divestitures (Summary of Significant Cash Flow Disclosures) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Noncash Impact Of Divestiture Of Businesses	$ 4,091	$ 0	$ 932
Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Depreciation	9,798	14,035	11,721
Amortization of intangible assets	3,428	7,432	5,627
Non-cash operating lease expense	2,964	0	0
Non-cash impairment charges	20,597	0	0
Debt and pension liability assumed by buyer with divestiture	2,206	0	0
Share-based compensation	986	414	140
Payments for property, plant and equipment	2,190	5,346	7,512
Noncash Impact Of Divestiture Of Businesses	$ 13,716	$ 0	$ 0