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Quarterly Information (Unaudited) (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Quarterly Financial Information [Line Items]                      
Restructuring charges $ 1,400 $ 4,700 $ 5,100 $ 4,100              
Goodwill and intangible asset impairment                 $ 0 $ 78,625 $ 0
General and administrative expenses                 261,433 265,910 238,305
Recognized unrealized loss, unconsolidated affiliates                 (3,528) 7,978 269
Foreign Tax Authority [Member] | Alberta [Member]                      
Quarterly Financial Information [Line Items]                      
Income tax expense, adjustment resulting from tax law change             $ 2,800        
Corporate [Member]                      
Quarterly Financial Information [Line Items]                      
Goodwill and intangible asset impairment         $ 78,600         78,600  
Corporate [Member] | Audit Committee Investigation [Member]                      
Quarterly Financial Information [Line Items]                      
General and administrative expenses         2,800 $ 4,100 7,500 $ 3,000   16,500  
Canadian Dollars [Member] | Pacer [Member]                      
Quarterly Financial Information [Line Items]                      
Goodwill and intangible asset impairment         78,600            
Other [Member] | Waha JVs [Member] | Interest Rate Swap [Member]                      
Quarterly Financial Information [Line Items]                      
Recognized unrealized loss, unconsolidated affiliates         4,400         4,400  
Other [Member] | Contracts Accounted for under Percentage-of-Completion [Member] | Canadian Dollars [Member] | Joint Venture [Member] | Pacer [Member]                      
Quarterly Financial Information [Line Items]                      
Project losses   $ 5,100     $ 8,000 2,800   5,500 5,100 16,300  
Communications [Member]                      
Quarterly Financial Information [Line Items]                      
Business combinations, acquisition integration costs           1,200 $ 7,800 $ 8,800   17,800 $ 5,300
Electrical Transmission [Member]                      
Quarterly Financial Information [Line Items]                      
Restructuring charges                 $ 8,900    
Electrical Transmission [Member] | Settled Litigation [Member]                      
Quarterly Financial Information [Line Items]                      
Court mandated mediation settlement charge           $ 12,200       12,200  
Electrical Transmission [Member] | Contracts Accounted for under Percentage-of-Completion [Member]                      
Quarterly Financial Information [Line Items]                      
Project losses       $ 15,100           $ 14,000