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Business, Basis of Presentation and Significant Accounting Policies (Goodwill and Indefinite-Lived Intangible Assets) (Narrative) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Goodwill and Indefinite-Lived Intangible Assets [Line Items]      
Goodwill impairment testing, number of reporting units   4 4
Goodwill, carrying amount (in dollars) $ 995,874 $ 988,511 $ 1,082,500
Goodwill, pre-tax impairment charge (in dollars) [1]   68,500  
Pre-Qualifications [Member]      
Goodwill and Indefinite-Lived Intangible Assets [Line Items]      
Indefinite-lived intangible assets, pre-tax impairment charge (in dollars) [2]   10,100  
Indefinite-lived intangible assets, carrying amount (in dollars) $ 74,600 $ 73,400 $ 93,300
Goodwill [Member]      
Goodwill and Indefinite-Lived Intangible Assets [Line Items]      
Impairment testing, significant assumptions Significant assumptions used in testing the reporting units included terminal values based on terminal growth rates ranging from 3.0% to 3.5%, nine years of discounted cash flows prior to the terminal value, and discount rates ranging from 13.0% to 14.5%.    
Impairment testing, number of years of discounted cash flows before terminal value 9 years 9 years 5 years
Impairment testing, discount rate sensitivity analysis, spread on discount rate for which evaluation was completed (percentage)   1.00%  
Impairment testing, EBITDA multiple     5.5
Goodwill [Member] | Minimum [Member]      
Goodwill and Indefinite-Lived Intangible Assets [Line Items]      
Goodwill impairment testing, terminal growth rate (percentage) 3.00% 3.00%  
Impairment testing, discount rate (percentage) 13.00% 12.00% 12.00%
Goodwill [Member] | Maximum [Member]      
Goodwill and Indefinite-Lived Intangible Assets [Line Items]      
Goodwill impairment testing, terminal growth rate (percentage) 3.50% 3.50%  
Impairment testing, discount rate (percentage) 14.50% 14.00% 13.50%
Indefinite-Lived Intangible Assets [Member] | Pre-Qualifications [Member]      
Goodwill and Indefinite-Lived Intangible Assets [Line Items]      
Impairment testing, significant assumptions Management estimated fair values using a cost methodology, incorporating estimates of the opportunity cost associated with the assets’ loss based on discounted cash flows over a two to three-year period. The impairment tests incorporated estimated discount rates ranging from 13.0% to 13.5%.    
Indefinite-Lived Intangible Assets [Member] | Minimum [Member] | Pre-Qualifications [Member]      
Goodwill and Indefinite-Lived Intangible Assets [Line Items]      
Impairment testing, number of years of discounted cash flows before terminal value 2 years 2 years  
Impairment testing, discount rate (percentage) 13.00% 12.00%  
Indefinite-Lived Intangible Assets [Member] | Maximum [Member] | Pre-Qualifications [Member]      
Goodwill and Indefinite-Lived Intangible Assets [Line Items]      
Impairment testing, number of years of discounted cash flows before terminal value 3 years 3 years  
Impairment testing, discount rate (percentage) 13.50% 14.00%  
Communications [Member]      
Goodwill and Indefinite-Lived Intangible Assets [Line Items]      
Number of aggregated components in reporting unit 1 1 1
Goodwill impairment testing, number of reporting units     1
Goodwill, carrying amount (in dollars) $ 420,700 $ 414,900 $ 417,700
Goodwill, pre-tax impairment charge (in dollars) [1]   $ 0  
Oil and Gas [Member]      
Goodwill and Indefinite-Lived Intangible Assets [Line Items]      
Number of aggregated components in reporting unit 1 1 1
Goodwill impairment testing, number of reporting units 2 3 2
Goodwill impairment testing, reporting unit, percentage of estimated fair value in excess of carrying value     15.00%
Goodwill, carrying amount (in dollars) $ 307,700 $ 306,100 $ 397,300
Goodwill, pre-tax impairment charge (in dollars) [1]   $ 68,500  
Oil and Gas [Member] | Pre-Qualifications [Member]      
Goodwill and Indefinite-Lived Intangible Assets [Line Items]      
Indefinite-lived intangible asset impairment testing, number of indefinite-lived intangible assets   2  
Oil and Gas [Member] | Reporting Unit Or Intangible, Quantitative Testing, Estimated Fair Value Not Substantially Exceeding Carrying Value [Member]      
Goodwill and Indefinite-Lived Intangible Assets [Line Items]      
Goodwill impairment testing, number of reporting units 1    
Goodwill impairment testing, reporting unit, percentage of estimated fair value in excess of carrying value 11.00%    
Goodwill, carrying amount (in dollars) $ 15,000    
Oil and Gas [Member] | Reporting Unit Or Intangible, Quantitative Testing, Impairment Charge Recorded [Member]      
Goodwill and Indefinite-Lived Intangible Assets [Line Items]      
Goodwill impairment testing, number of reporting units   1  
Goodwill, carrying amount (in dollars)   $ 11,200  
Goodwill, pre-tax impairment charge (in dollars)   $ 68,500  
Oil and Gas [Member] | Reporting Unit Or Intangible, Quantitative Testing, Impairment Charge Recorded [Member] | Pre-Qualifications [Member]      
Goodwill and Indefinite-Lived Intangible Assets [Line Items]      
Indefinite-lived intangible asset impairment testing, number of indefinite-lived intangible assets   1  
Indefinite-lived intangible assets, pre-tax impairment charge (in dollars)   $ 10,100  
Indefinite-lived intangible assets, carrying amount (in dollars)   $ 20,500  
Oil and Gas [Member] | Goodwill [Member] | Reporting Unit Or Intangible, Quantitative Testing, Estimated Fair Value Not Substantially Exceeding Carrying Value [Member]      
Goodwill and Indefinite-Lived Intangible Assets [Line Items]      
Impairment testing, sensitivity analysis, description a 100 basis point increase in the discount rate would not have resulted in the reporting unit carrying value exceeding fair value    
Impairment testing, discount rate sensitivity analysis, spread on discount rate for which evaluation was completed (percentage) 1.00%    
Electrical Transmission [Member]      
Goodwill and Indefinite-Lived Intangible Assets [Line Items]      
Number of aggregated components in reporting unit 4 4 4
Goodwill impairment testing, number of reporting units   1  
Goodwill impairment testing, reporting unit, percentage of estimated fair value in excess of carrying value 5.00% 5.00%  
Goodwill, carrying amount (in dollars) $ 149,900 $ 149,900 $ 149,900
Goodwill, pre-tax impairment charge (in dollars) [1]   $ 0  
Electrical Transmission [Member] | Pre-Qualifications [Member]      
Goodwill and Indefinite-Lived Intangible Assets [Line Items]      
Indefinite-lived intangible asset impairment testing, number of indefinite-lived intangible assets   1  
Electrical Transmission [Member] | Goodwill [Member]      
Goodwill and Indefinite-Lived Intangible Assets [Line Items]      
Impairment testing, sensitivity analysis, description A 100 basis point increase in the discount rate would have resulted in the Electrical Transmission operating segment carrying value exceeding fair value.    
Impairment testing, discount rate sensitivity analysis, spread on discount rate for which evaluation was completed (percentage) 1.00% 1.00%  
Power Generation and Industrial [Member]      
Goodwill and Indefinite-Lived Intangible Assets [Line Items]      
Number of aggregated components in reporting unit 1 1 1
Goodwill impairment testing, number of reporting units     1
Goodwill, carrying amount (in dollars) $ 117,600 $ 117,600 $ 117,600
Goodwill, pre-tax impairment charge (in dollars) [1]   $ 0  
Indefinite-lived intangible asset impairment testing, percentage of fair value in excess of carrying amount     10.00%
Power Generation and Industrial [Member] | Indefinite-Lived Intangible Assets [Member]      
Goodwill and Indefinite-Lived Intangible Assets [Line Items]      
Impairment testing, discount rate (percentage)     10.50%
Other [Member]      
Goodwill and Indefinite-Lived Intangible Assets [Line Items]      
Number of aggregated components in reporting unit 1 1 1
[1] Represents a non-cash goodwill impairment charge related to a reporting unit in western Canada.
[2] Represents a non-cash impairment charge related to intangible assets associated with a reporting unit in western Canada.