Divestitures Divestitures - Other Assets and Liabilities Held for Sale (Details) - USD ($) $ in Thousands	Apr. 03, 2018	Mar. 31, 2018	Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Current assets		$ 35,829	$ 39,152
Goodwill		14,400	14,400
Other intangibles, net of amortization		3,800	3,600
Current liabilities		2,173	1,938
Assets held for sale, excluding discontinued operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Current assets		35,829	39,152
Net, property, plant and equipment		133,506	121,759
Goodwill		14,422	14,422
Other intangibles, net of amortization		3,815	3,632
Assets held for sale		187,572	178,965
Current liabilities		2,173	1,938
Noncurrent liabilities		682	614
Liabilities held for sale		$ 2,855	$ 2,552
Subsequent Event | Assets held for sale, excluding discontinued operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash proceeds from divestitures, net	$ 416,000