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Segments and Related Information (Schedule of Segment Reporting Information, by Segment - Capital Expenditures) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Segment Reporting Information [Line Items] |  |  |
Capital expenditures | $ 126,288 | $ 79,686 | $ 71,710
Continuing Operations [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital expenditures | 126,100 | 79,400 | 71,000
Continuing Operations [Member] | Operating Segments [Member] | Communications [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital expenditures | 25,100 | 19,200 | 23,000
Continuing Operations [Member] | Operating Segments [Member] | Oil and Gas [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital expenditures | 67,400 | 40,300 | 25,700
Continuing Operations [Member] | Operating Segments [Member] | Electrical Transmission [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital expenditures | 17,600 | 11,500 | 9,300
Continuing Operations [Member] | Operating Segments [Member] | Power Generation and Industrial [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital expenditures | 5,700 | 5,600 | 4,600
Continuing Operations [Member] | Operating Segments [Member] | Other Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital expenditures | 0 | 0 | 0
Continuing Operations [Member] | Corporate, Non-Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital expenditures | $ 10,300 | $ 2,800 | $ 8,400

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- Definition The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration