Acquisitions (PAM) (Details) (USD $)	0 Months Ended	12 Months Ended
	Nov. 07, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Business Acquisition [Line Items]
Goodwill		$ 68,253,000	$ 68,214,000	$ 50,485,000
PAM Fastening Technology, Inc.
Business Acquisition [Line Items]
Interest acquired (as a percent)	100.00%
Purchase price	9,200,000
Working capital	2,500,000
Property, plant and equipment	200,000
Sales		11,900,000	1,500,000
Operating income		1,400,000	200,000
Goodwill	3,500,000
Intangible assets deferred tax	2,000,000
Trade Names and Customer Relationships | PAM Fastening Technology, Inc.
Business Acquisition [Line Items]
Other intangibles	$ 5,000,000