Segments and Related Information (Schedule of Significant Customers, Revenue Concentration Information) (Details) - Customer Concentration Risk [Member] - Revenue [Member]		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Communications [Member] | AT&T (including DIRECTV) [Member]
Revenue, Significant Customers [Line Items]
Significant customers, percentage of total consolidated revenue	[1],[2]	36.00%	30.00%	37.00%	31.00%
Oil and Gas [Member] | Energy Transfer Affiliates [Member]
Revenue, Significant Customers [Line Items]
Significant customers, percentage of total consolidated revenue	[3]	22.00%	2.00%	20.00%	4.00%

[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 Energy Transfer affiliates is based upon various construction contracts for pipeline activities with Energy Transfer Partners L.P., Sunoco Logistics Partners L.P., and their subsidiaries and affiliates, all of which are consolidated by Energy Transfer Equity, L.P. Revenue from Energy Transfer affiliates is included in the Oil and Gas segment.