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Segments and Related Information (Schedule of Significant Customers, Revenue Concentration Information) (Details) - Customer Concentration Risk [Member] - Revenue [Member] | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Communications [Member] | AT&T (including DIRECTV) [Member] |  |  |  |  |
Revenue, Significant Customers [Line Items] |  |  |  |  |
Significant customers, percentage of total consolidated revenue | [1],[2] | 31.00% | 28.00% | 31.00% | 33.00%
Oil and Gas [Member] | Enbridge, Inc. [Member] |  |  |  |  |
Revenue, Significant Customers [Line Items] |  |  |  |  |
Significant customers, percentage of total consolidated revenue | [3] | 0.00% | 10.00% | 1.00% | 10.00%
[1] | DIRECTV® was acquired by AT&T in July 2015. Revenue from DIRECTV® is presented on a combined basis with AT&T for all periods.
[2] | The Company’s relationship with AT&T is based upon multiple separate master service agreements, other service agreements and construction/installation contracts for AT&T’s (i) wireless, (ii) wireline/fiber, (iii) home security and automation businesses, and (iv) for DIRECTV® services, is based upon an agreement to provide installation and maintenance services. Revenue from AT&T is included in the Communications segment.
[3] | The Company’s relationship with Enbridge, Inc. is based upon various construction contracts for natural gas pipelines. Revenue from Enbridge, Inc. is included in the Oil and Gas segment.

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