Goodwill and Other Intangibles (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Goodwill acquired during the period	$ 18,169,000	$ 3,267,000
Adjustments	454,000
Amortization expense	4,200,000	3,300,000	3,300,000
Joining Materials
Finite-Lived Intangible Assets [Line Items]
Goodwill acquired during the period	14,767,000	0
Adjustments	0
Building Materials
Finite-Lived Intangible Assets [Line Items]
Goodwill acquired during the period	3,402,000	3,267,000
Adjustments	$ 454,000