Discontinued Operations Discontinued Operations - NI Industries (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 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	$ (6,780)	$ 11,760	$ (4,740)	$ 17,450
Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Revenue	158,540	179,270	300,900	330,180
Income (loss) from discontinued operations, net of tax	(6,780)	11,760	(4,740)	17,450
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	1,000	0	3,300
Income (loss) from discontinued operations, net of tax	$ 0	$ 200	$ 0	$ 100