Investments (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]
Equity Investments	$ 5,907		$ 5,824
Equity in Income/(Loss) of Nonconsolidated Investment	173	204
Proceeds from Equity Method Investment, Dividends or Distributions, Return of Capital	90	90
LB Pipe & Coupling Products, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity Investments	5,845		5,746
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	189	204
Proceeds from Equity Method Investment, Dividends or Distributions, Return of Capital	90	90
Capital Leases, Net Investment in Direct Financing Leases	1,087		1,117
Other Investments [Member]
Schedule of Equity Method Investments [Line Items]
Equity Investments	62		78
Capital Leased Land [Member]
Schedule of Equity Method Investments [Line Items]
Area of Land	5
Capital Leased Assets, Number of Units	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.