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Segment Reporting (Total Assets for Reportable Segments) (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]    
Assets $ 11,469,432 $ 11,103,925
Southern [Member]    
Segment Reporting Information [Line Items]    
Assets 2,813,993 2,869,841
Western [Member]    
Segment Reporting Information [Line Items]    
Assets 1,502,583 1,516,870
Eastern [Member]    
Segment Reporting Information [Line Items]    
Assets 1,941,755 1,541,854
Canada [Member]    
Segment Reporting Information [Line Items]    
Assets 2,533,253 2,532,046
Central [Member]    
Segment Reporting Information [Line Items]    
Assets 1,296,480 1,302,900
Exploration and Production [Member]    
Segment Reporting Information [Line Items]    
Assets 985,634 1,068,086
Corporate [Member]    
Segment Reporting Information [Line Items]    
Assets $ 395,734 $ 272,328