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Business, Basis of Presentation and Significant Accounting Policies (Goodwill and Indefinite-Lived Intangible Assets) (Narrative) (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Goodwill and Indefinite-Lived Intangible Assets [Line Items]        
Goodwill impairment testing, number of aggregated components in reporting unit       0
Goodwill impairment testing, discounted cash flow methodology, number of reporting units     4 3
Goodwill, pre-tax impairment charge $ 68,500 $ 68,500    
Goodwill, carrying amount 988,511 $ 988,511 $ 1,082,466 $ 902,000
Indefinite-lived intangible assets, pre-tax impairment charge 10,100      
Goodwill [Member]        
Goodwill and Indefinite-Lived Intangible Assets [Line Items]        
Impairment testing, fair value measurements, significant assumptions   Estimated discount rates were determined using the Company’s average cost of capital at the time of the analysis, taking into consideration the risk inherent within each reporting unit individually, which are greater than the risk inherent in the Company as a whole. Significant assumptions used in testing the reporting units included terminal values based on terminal growth rates ranging from 3.0%-3.5%, nine years of discounted cash flows prior to the terminal value, and discount rates ranging from 12.0% to 14.0%. Management believes the assumptions used in its quantitative goodwill impairment tests are reflective of the risks inherent in the business models of its reporting units and within its industry.    
Impairment testing, number of years of cash flows before terminal value   9 years 5 years 5 years
Impairment testing, discount rate (percentage)       7.20%
Impairment testing, fair value measurements, sensitivity analysis, description   A 100 basis point change in the discount rate would not have had a material impact on the results of these impairment tests as of the date the testing was performed.    
Impairment testing, discount rate sensitivity analysis, spread on discount rate for which evaluation was completed   1.00%    
Impairment testing, fair value inputs, EBITDA multiple     5.5 5.5
Goodwill [Member] | Minimum [Member]        
Goodwill and Indefinite-Lived Intangible Assets [Line Items]        
Goodwill impairment testing, growth rate (percentage)   3.00%    
Impairment testing, discount rate (percentage)   12.00% 12.00%  
Goodwill [Member] | Maximum [Member]        
Goodwill and Indefinite-Lived Intangible Assets [Line Items]        
Goodwill impairment testing, growth rate (percentage)   3.50%    
Impairment testing, discount rate (percentage)   14.00% 13.50%  
Indefinite-Lived Intangible Assets [Member]        
Goodwill and Indefinite-Lived Intangible Assets [Line Items]        
Impairment testing, discount rate (percentage)       7.20%
Indefinite-Lived Intangible Assets [Member] | Minimum [Member]        
Goodwill and Indefinite-Lived Intangible Assets [Line Items]        
Impairment testing, number of years of cash flows before terminal value   2 years    
Impairment testing, discount rate (percentage)   12.00%    
Indefinite-Lived Intangible Assets [Member] | Maximum [Member]        
Goodwill and Indefinite-Lived Intangible Assets [Line Items]        
Impairment testing, number of years of cash flows before terminal value   3 years    
Impairment testing, discount rate (percentage)   14.00%    
Electrical Transmission [Member]        
Goodwill and Indefinite-Lived Intangible Assets [Line Items]        
Goodwill impairment testing, number of aggregated components in reporting unit   4 4  
Goodwill impairment testing, discounted cash flow methodology, number of reporting units   1   1
Goodwill, pre-tax impairment charge   $ 0    
Goodwill, carrying amount $ 149,900 $ 149,900 $ 149,900 $ 149,900
Goodwill impairment testing, reporting unit, percentage of fair value in excess of carrying amount 5.00% 5.00%    
Indefinite-lived intangible asset impairment testing, discounted cash flow methodology, number of indefinite-lived intangible assets   1    
Electrical Transmission [Member] | Goodwill [Member]        
Goodwill and Indefinite-Lived Intangible Assets [Line Items]        
Impairment testing, fair value measurements, sensitivity analysis, description   A 100 basis point change 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   1.00%    
Communications [Member]        
Goodwill and Indefinite-Lived Intangible Assets [Line Items]        
Goodwill impairment testing, number of aggregated components in reporting unit   0 0  
Goodwill impairment testing, discounted cash flow methodology, number of reporting units     1  
Goodwill, pre-tax impairment charge   $ 0    
Goodwill, carrying amount $ 414,900 $ 414,900 $ 417,700 $ 326,800
Power Generation and Industrial [Member]        
Goodwill and Indefinite-Lived Intangible Assets [Line Items]        
Goodwill impairment testing, number of aggregated components in reporting unit   0 0  
Goodwill impairment testing, discounted cash flow methodology, number of reporting units     1 1
Goodwill, pre-tax impairment charge   $ 0    
Goodwill, carrying amount 117,600 $ 117,600 $ 117,600 $ 117,600
Indefinite-lived intangible asset impairment testing, percentage of fair value in excess of carrying amount     10.00%  
Power Generation and Industrial [Member] | Goodwill [Member]        
Goodwill and Indefinite-Lived Intangible Assets [Line Items]        
Impairment testing, discount rate (percentage)     10.50%  
Oil and Gas [Member]        
Goodwill and Indefinite-Lived Intangible Assets [Line Items]        
Goodwill impairment testing, number of aggregated components in reporting unit   0 0  
Goodwill impairment testing, discounted cash flow methodology, number of reporting units   3 2 1
Goodwill impairment testing, number of reporting units, second step impairment testing   1    
Goodwill, pre-tax impairment charge 68,500 $ 68,500    
Goodwill, carrying amount 306,100 $ 306,100 $ 397,300 $ 307,700
Goodwill impairment testing, reporting unit, percentage of fair value in excess of carrying amount     15.00%  
Indefinite-lived intangible asset impairment testing, discounted cash flow methodology, number of indefinite-lived intangible assets   2    
Indefinite-lived intangible assets, pre-tax impairment charge 10,100      
Oil and Gas [Member] | Reporting Unit For Which Impairment Charge Was Recorded [Member]        
Goodwill and Indefinite-Lived Intangible Assets [Line Items]        
Goodwill, carrying amount 11,200 $ 11,200    
Indefinite-lived intangible assets, carrying amount $ 20,500 $ 20,500    
Other [Member]        
Goodwill and Indefinite-Lived Intangible Assets [Line Items]        
Goodwill impairment testing, number of aggregated components in reporting unit   0 0