Investments (Narrative) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($) a property	Mar. 31, 2015 USD ($)	Dec. 31, 2015 USD ($)
Schedule of Equity Method Investments [Line Items]
Equity Investments	$ 5,124		$ 5,321
Equity in Income/(Loss) of Nonconsolidated Investment	(196)	$ 173
Proceeds from Equity Method Investment, Dividends or Distributions, Return of Capital	0	90
LB Pipe & Coupling Products, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity Investments	$ 4,996		5,246
Equity Method Investment, Ownership Percentage	45.00%
Equity Method Investment, Description of Principal Activities	The Company is a member of a joint venture, LB Pipe & Coupling Products, LLC ("LB Pipe JV"), in which it maintains a 45% ownership interest. The LB Pipe JV manufactures, markets, and sells various precision coupling products for the energy, utility, and construction markets and is scheduled to terminate on June 30, 2019.
Equity in Income/(Loss) of Nonconsolidated Investment	$ (250)	$ 189
Line of credit, maximum lending capacity	750
Due from Joint Ventures, Current	575
Other Investments [Member]
Schedule of Equity Method Investments [Line Items]
Equity Investments	$ 128		$ 75
Capital Leased Land [Member] | LB Pipe & Coupling Products, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Area of Land | a	5
Capital Leased Assets, Number of Units | property	2
Capital Lease Length Of Renewal Term	5 years 6 months
Capital Leases, Monthly Rent	$ 17
Capital Leases Balloon Payment In Direct Financing Leases	$ 488
Variable Interest Entity, Not Primary Beneficiary, Aggregated Disclosure [Member]
Schedule of Equity Method Investments [Line Items]
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 LB Pipe JV is a variable interest entity. 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 LB Pipe JV. Accordingly, the Company concluded that the equity method of accounting remains appropriate.