Investments (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule of Equity Method Investments [Line Items]
Equity Investments	$ 5,824	$ 5,090
Equity in Income/(Loss) of Nonconsolidated Investment	1,282	1,316	837
Proceeds from Equity Method Investment, Dividends or Distributions, Return of Capital	630	558	0
LB Pipe JV [Member]
Schedule of Equity Method Investments [Line Items]
Equity Investments	5,746	5,090
Equity Method Investment, Ownership Percentage	45.00%
Equity Method Investment, Description of Principal Activities	The Company is a member of a joint venture, L B Pipe and 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	1,286	1,316	837
Proceeds from Equity Method Investment, Dividends or Distributions, Return of Capital	630	558
Capital Leases, Net Investment in Direct Financing Leases	1,117	1,224
Other Investments [Member]
Schedule of Equity Method Investments [Line Items]
Equity Investments	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 Lease Term	9 years 6 months
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