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Segments and Related Information (Schedule of Financial Information by Reportable Segment - Revenue) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Revenue:        
Revenue (in dollars) $ 1,939,006 $ 1,617,804 $ 3,457,346 $ 3,014,638
Communications [Member] | Customer Concentration Risk [Member] | Revenue [Member] | Utilities [Member]        
Revenue:        
Utilities customers, percentage of Communications segment revenue 15.40% 13.60% 15.50% 15.70%
Reportable Segments [Member] | Communications [Member]        
Revenue:        
Revenue (in dollars) [1] $ 652,600 $ 618,600 $ 1,265,400 $ 1,245,700
Reportable Segments [Member] | Oil and Gas [Member]        
Revenue:        
Revenue (in dollars) 936,800 769,300 1,558,100 1,305,800
Reportable Segments [Member] | Electrical Transmission [Member]        
Revenue:        
Revenue (in dollars) 100,400 84,500 195,300 198,500
Reportable Segments [Member] | Power Generation and Industrial [Member]        
Revenue:        
Revenue (in dollars) 250,200 146,000 439,600 263,600
Reportable Segments [Member] | Other [Member]        
Revenue:        
Revenue (in dollars) 0 200 100 2,200
Eliminations [Member]        
Revenue:        
Revenue (in dollars) $ (1,000) $ (800) $ (1,200) $ (1,200)
[1]
Revenue generated primarily by utilities customers represented 15.4% and 13.6% of Communications segment revenue for the three month periods ended June 30, 2019 and 2018, respectively, and represented 15.5% and 15.7% for the six month periods ended June 30, 2019 and 2018, respectively.