Divestitures Divestitures- Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss from discontinued operations (net of tax)	$ 0	$ (398,340)	$ 0	$ (381,028)
Chemetall Surface Treatment
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales		218,355		426,542
Cost of goods sold		120,448		233,771
Operating expenses, net		69,595		132,448
Interest and financing expenses		9,911		20,048
Other income, net		(832)		(1,770)
Income before income taxes		19,233		42,045
Income tax expense		417,573		423,073
Loss from discontinued operations (net of tax)		$ (398,340)		(381,028)
Depreciation and amortization				35,194
Capital expenditures				$ 10,371