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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, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Goodwill and Indefinite-Lived Intangible Assets [Line Items]      
Goodwill impairment testing, number of reporting units     4
Goodwill, carrying amount (in dollars) $ 1,137,738 $ 995,874 $ 988,500
Pre-Qualifications [Member]      
Goodwill and Indefinite-Lived Intangible Assets [Line Items]      
Indefinite-lived intangible assets, carrying amount (in dollars) 77,600 74,600 73,400
Trade Names [Member]      
Goodwill and Indefinite-Lived Intangible Assets [Line Items]      
Indefinite-lived intangible assets, carrying amount (in dollars) $ 34,500 $ 34,500 $ 34,800
Goodwill [Member]      
Goodwill and Indefinite-Lived Intangible Assets [Line Items]      
Fair value measurements, valuation techniques Management estimated their respective fair values using a combination of market and income approaches. Under the market approach, fair values were estimated using published market multiples for comparable companies. Under the income approach, a discounted cash flow methodology was used, including: (i) management estimates, such as projections of revenue, operating costs and cash flows, taking into consideration historical and anticipated financial results; (ii) general economic and market conditions; and (iii) the impact of planned business and operational strategies. Estimated discount rates were determined using the Company’s average cost of capital at the time of the analysis, taking into consideration the risks inherent within each reporting unit individually, which are greater than the risks inherent in the Company as a whole.    
Impairment testing, significant assumptions In 2017, significant assumptions used in testing the reporting units included terminal values based on a terminal growth rate of 3.5%, five to nine years of discounted cash flows prior to the terminal value, and discount rates ranging from 13.0% to 15.5%.    
Goodwill impairment testing, terminal growth rate (percentage) 3.50%    
Impairment testing, number of years of discounted cash flows before terminal value   9 years 9 years
Impairment testing, discount rate sensitivity analysis, spread on discount rate for which evaluation was completed (percentage)     1.00%
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, number of years of discounted cash flows before terminal value 5 years    
Impairment testing, discount rate (percentage) 13.00% 13.00% 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, number of years of discounted cash flows before terminal value 9 years    
Impairment testing, discount rate (percentage) 15.50% 14.50% 14.00%
Indefinite-Lived Intangible Assets [Member] | Pre-Qualifications [Member]      
Goodwill and Indefinite-Lived Intangible Assets [Line Items]      
Impairment testing, significant assumptions Management estimated the fair values of these intangible assets using a cost methodology, incorporating estimates of the opportunity cost associated with the assets’ loss based on discounted cash flows over a two to four-year period. The impairment tests incorporated estimated discount rates ranging from 13.0% to 14.0%.    
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 2 years
Impairment testing, discount rate (percentage) 13.00% 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 4 years 3 years 3 years
Impairment testing, discount rate (percentage) 14.00% 13.50% 14.00%
Power Generation and Industrial [Member]      
Goodwill and Indefinite-Lived Intangible Assets [Line Items]      
Number of reporting unit(s) which comprise(s) more than one component 1    
Number of aggregated components in reporting unit 2 1 1
Goodwill impairment testing, number of reporting units 1    
Goodwill, carrying amount (in dollars) $ 135,800 $ 117,600 $ 117,600
Power Generation and Industrial [Member] | Indefinite-Lived Intangible Assets [Member] | Trade Names [Member]      
Goodwill and Indefinite-Lived Intangible Assets [Line Items]      
Impairment testing, significant assumptions Management estimated the fair value of the intangible asset using an income approach, incorporating estimates of discounted cash flows over a five-year period prior to the terminal value. The impairment test incorporated an estimated discount rate of 14%.    
Impairment testing, number of years of discounted cash flows before terminal value 5 years    
Impairment testing, discount rate (percentage) 14.00%    
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 2 3
Goodwill, carrying amount (in dollars) $ 385,600 $ 307,700 $ 306,100
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 2 1  
Goodwill, carrying amount (in dollars)   $ 15,000  
Goodwill impairment testing, reporting unit, percentage of estimated fair value in excess of carrying value   11.00%  
Oil and Gas [Member] | Reporting Unit or Intangible, Quantitative Testing, Estimated Fair Value Not Substantially Exceeding Carrying Value [Member] | Pre-Qualifications [Member]      
Goodwill and Indefinite-Lived Intangible Assets [Line Items]      
Indefinite-lived intangible assets, carrying amount (in dollars) $ 45,000    
Indefinite-lived intangible assets impairment testing, percentage of estimated fair value in excess of carrying value 19.00%    
Oil and Gas [Member] | Reporting Unit A Quantitative Testing, Estimated Fair Value Not Substantially Exceeding Carrying Value [Member]      
Goodwill and Indefinite-Lived Intangible Assets [Line Items]      
Goodwill, carrying amount (in dollars) $ 65,000    
Goodwill impairment testing, reporting unit, percentage of estimated fair value in excess of carrying value 10.00%    
Oil and Gas [Member] | Reporting Unit B Quantitative Testing, Estimated Fair Value Not Substantially Exceeding Carrying Value [Member]      
Goodwill and Indefinite-Lived Intangible Assets [Line Items]      
Goodwill, carrying amount (in dollars) $ 15,000    
Goodwill impairment testing, reporting unit, percentage of estimated fair value in excess of carrying value 19.00%    
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 assets, carrying amount (in dollars)     $ 20,500
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
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 units’ carrying values exceeding their fair values.    
Impairment testing, discount rate sensitivity analysis, spread on discount rate for which evaluation was completed (percentage) 1.00% 1.00%  
Oil and Gas [Member] | Indefinite-Lived Intangible Assets [Member] | Reporting Unit or Intangible, Quantitative Testing, Estimated Fair Value Not Substantially Exceeding Carrying Value [Member] | Pre-Qualifications [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 this asset’s carrying value exceeding its fair value.    
Impairment testing, discount rate sensitivity analysis, spread on discount rate for which evaluation was completed (percentage) 1.00%    
Communications [Member]      
Goodwill and Indefinite-Lived Intangible Assets [Line Items]      
Number of aggregated components in reporting unit 1 1 1
Goodwill, carrying amount (in dollars) $ 466,400 $ 420,700 $ 414,900
Electrical Transmission [Member]      
Goodwill and Indefinite-Lived Intangible Assets [Line Items]      
Goodwill, carrying amount (in dollars) $ 149,900 $ 149,900 $ 149,900
Goodwill impairment testing, reporting unit, percentage of estimated fair value in excess of carrying value   5.00% 5.00%
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, discount rate sensitivity analysis, spread on discount rate for which evaluation was completed (percentage)   1.00% 1.00%
Other [Member]      
Goodwill and Indefinite-Lived Intangible Assets [Line Items]      
Number of aggregated components in reporting unit 1 1 1