Acquisitions Narrative (Details) - USD ($) $ in Thousands	Mar. 31, 2015	Jun. 30, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Goodwill		$ 89,499	$ 68,253
OMG | ITW
Business Acquisition [Line Items]
Purchase price	$ 27,400
Working capital adjustments	400
Net working capital	1,700
Plant and equipment	100
Intangible assets	4,400
Goodwill	$ 21,300