Investments (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	1 Months Ended	9 Months Ended	12 Months Ended				1 Months Ended	2 Months Ended	12 Months Ended
	Oct. 31, 2012	Sep. 30, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Capital Leased Land [Member] acre	Nov. 30, 2012 Capital Leased Land First Amendment To Lease Additional Monthly Rent [Member]	Dec. 31, 2012 Capital Leased Land First Amendment To Lease Monthly Rent Total [Member]	Dec. 31, 2012 Variable Interest Entity, Not Primary Beneficiary, Aggregated Disclosure [Member]
Schedule of Equity Method Investments [Line Items]
Equity Investments			$ 4,332	$ 3,495
Equity Method Investment, Ownership Percentage			45.00%
Equity Method Investment, Description of Principal Activities			The Company is a member of a joint venture with L B Industries, Inc. and James Legg until June 30, 2019.  The Company and L B Industries, Inc. each have a 45% ownership interest in the joint venture, L B Pipe & Coupling Products, LLC (JV). The JV manufactures, markets and sells various precision coupling products for the energy, utility and construction markets
Payments to Acquire Interest in Joint Venture				3,000
Variable Interest Entity, Methodology for Determining Whether Entity is Primary Beneficiary									Under applicable guidance for variable interest entities in ASC 810, "Consolidation," the Company determined that the JV is a variable interest entity, as the JV has not demonstrated that it has sufficient equity to support its operations without additional financial support. The Company concluded that it is not the primary beneficiary of the variable interest entity, as the Company does not have a controlling financial interest and does not have the power to direct the activities that most significantly impact the economic performance of the JV. Accordingly, the Company concluded that the equity method of accounting remains appropriate
Equity in Income/(Loss) of Nonconsolidated Investment			837	707	(213)
Area of Land						5
Capital Lease Length Of Lease Term			9 years 6 months
Capital Lease Length Of Renewal Term			5 years 6 months
Capital Leases, Monthly Rent	10	10					7	17
Capital Leases Balloon Payment In Direct Financing Leases			488
Capital Leases, Net Investment in Direct Financing Leases			$ 1,327	$ 971