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Segment Reporting (Total Assets for Reportable Segments) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]      
Assets $ 13,270,235 $ 12,833,830 $ 12,627,329
Eastern [Member]      
Segment Reporting Information [Line Items]      
Assets 2,737,208   2,673,316
Southern [Member]      
Segment Reporting Information [Line Items]      
Assets 2,994,260   2,892,994
Western [Member]      
Segment Reporting Information [Line Items]      
Assets 1,697,050   1,596,129
Central [Member]      
Segment Reporting Information [Line Items]      
Assets 1,884,207   1,506,326
Canada [Member]      
Segment Reporting Information [Line Items]      
Assets 2,454,152   2,412,971
Exploration and Production [Member]      
Segment Reporting Information [Line Items]      
Assets 962,761   969,808
Corporate [Member]      
Segment Reporting Information [Line Items]      
Assets $ 540,597   $ 575,785