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Segments and Related Information (Schedule of Segment Reporting Information, by Segment - Depreciation and Amortization) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Segment Reporting Information [Line Items] |  |  |
Depreciation and amortization | $ 140,928 | $ 92,601 | $ 75,228
Continuing Operations [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation and amortization | 140,926 | 91,958 | 74,151
Continuing Operations [Member] | Operating Segments [Member] | Communications [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation and amortization | 36,800 | 29,100 | 24,500
Continuing Operations [Member] | Operating Segments [Member] | Oil and Gas [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation and amortization | 80,900 | 42,000 | 30,700
Continuing Operations [Member] | Operating Segments [Member] | Electrical Transmission [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation and amortization | 12,600 | 11,000 | 8,500
Continuing Operations [Member] | Operating Segments [Member] | Power Generation and Industrial [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation and amortization | 6,700 | 6,700 | 7,700
Continuing Operations [Member] | Operating Segments [Member] | Other Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation and amortization | 0 | 100 | 100
Continuing Operations [Member] | Corporate, Non-Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation and amortization | $ 3,900 | $ 3,100 | $ 2,700

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- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
Name: | us-gaap_DepreciationDepletionAndAmortization
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration