Investments (Narrative) (Details) $ in Thousands			12 Months Ended
		Nov. 23, 2015 USD ($)	Dec. 31, 2016 USD ($) a property	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Schedule of Equity Method Investments [Line Items]
Equity Investments			$ 4,031	$ 5,321
Equity in Income/(Loss) of Nonconsolidated Investment			(1,290)	(413)	$ 1,282
Other income	[1]			580	0
Proceeds from Equity Method Investment, Dividends or Distributions, Return of Capital			0	90	630
TEW Plus LTD [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage		25.00%
Other income		$ 580
LB Pipe JV [Member]
Schedule of Equity Method Investments [Line Items]
Equity Investments			$ 3,902	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, L B Pipe and Coupling Products, LLC ("LB Pipe JV"), in which it maintains a 45% ownership interest. 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			$ (1,345)	(410)	$ 1,286
Line of credit, maximum lending capacity			1,350
Other equity investments [Member]
Schedule of Equity Method Investments [Line Items]
Equity Investments			$ 129	$ 75
Capital Leased Land [Member]
Schedule of Equity Method Investments [Line Items]
Area of Land | a			5
Capital Leased Assets, Number of Units | property			2
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 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 LB Pipe JV. Accordingly, the Company concluded that the equity method of accounting remains appropriate

[1] On November 23, 2015, the Company acquired the remaining 75% of shares of Tew Plus resulting in a gain of $580, which is recorded within other income as of December 31, 2015. The gain is included in equity loss (income) and remeasurement gain within the Consolidated Statements of Cash Flows.