Divestiture (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Apr. 01, 2019	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Jan. 01, 2019	Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of business	$ 265,500			$ 243,362	$ 0
Gain on sale of business		$ (189,910)	$ 0	(189,910)	$ 0
Receivables Held-for-sale, Amount							$ 35,498
Disposal Group, Including Discontinued Operation, Other Assets, Current							3,797
Disposal Group, Including Discontinued Operation, Inventory							13,774
Disposal Group, Including Discontinued Operation, Prepaid and Other Assets							1,759
Disposal Group, Including Discontinued Operation, Prepaid and Other Assets, Current							1,197
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment, Current							31,148
Disposal Group, Including Discontinued Operation, Goodwill							13,500
Disposal Group, Including Discontinued Operation, Other Assets, Noncurrent							3,225
Assets held for sale		0		0		$ 113,457	103,898
Disposal Group, Including Discontinued Operation, Accounts Payable							38,065
Disposal Group, Including Discontinued Operation, Accounts Payable and Accrued Liabilities							6,826
Disposal Group, Including Discontinued Operation, Accrued Liabilities, Current							1,000
Disposal Group, Including Discontinued Operation, Pension Plan Benefit Obligation							15,894
Disposal Group, Including Discontinued Operation, Postretirement Plan Benefit Obligation							9,281
Disposal Group, Including Discontinued Operation, Other Liabilities							129
Liabilities held for sale		$ 0		$ 0		$ 80,756	$ 71,195
Minimum [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of business	215,000
Maximum [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of business	$ 220,000