The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Goodwill and Other Intangibles (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Goodwill acquired during the period	$ 0	$ 18,169,000
Adjustments	(76,000)us-gaap_GoodwillOtherChanges	454,000us-gaap_GoodwillOtherChanges
Amortization expense	3,200,000us-gaap_AmortizationOfIntangibleAssets	2,700,000us-gaap_AmortizationOfIntangibleAssets	1,800,000us-gaap_AmortizationOfIntangibleAssets
Joining Materials
Finite-Lived Intangible Assets [Line Items]
Goodwill acquired during the period	0
Adjustments	0	0
Joining Materials \| Wolverine Joining Technologies, LLC
Finite-Lived Intangible Assets [Line Items]
Goodwill acquired during the period		14,767,000
Building Materials
Finite-Lived Intangible Assets [Line Items]
Goodwill acquired during the period	0
Adjustments	(76,000)
Building Materials \| Wolverine Joining Technologies, LLC
Finite-Lived Intangible Assets [Line Items]
Adjustments		454,000
Building Materials \| PAM Fastening Technology, Inc.
Finite-Lived Intangible Assets [Line Items]
Goodwill acquired during the period		$ 3,402,000