Discontinued Operations Discontinued Operations - NI Industries (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (loss) from discontinued operations, net of tax	$ 0	$ 11,140	$ (4,740)	$ 28,590
NI Industries business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from Sale of Productive Assets		6,700
Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Revenue		157,870	300,900	488,050
Income (loss) from discontinued operations, net of tax		11,140	(4,740)	28,590
Discontinued Operations [Member] | NI Industries business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Revenue	0	100	0	3,400
Income (loss) from discontinued operations, net of tax	$ 0	$ 3,800	$ 0	$ 3,800