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Segment Reporting (Total Assets for Reportable Segments) (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]      
Assets $ 13,145,772 $ 12,833,830 $ 12,627,329
Eastern [Member]      
Segment Reporting Information [Line Items]      
Assets 2,720,643   2,673,316
Southern [Member]      
Segment Reporting Information [Line Items]      
Assets 2,965,048   2,892,994
Western [Member]      
Segment Reporting Information [Line Items]      
Assets 1,680,268   1,596,129
Central [Member]      
Segment Reporting Information [Line Items]      
Assets 1,880,010   1,506,326
Canada [Member]      
Segment Reporting Information [Line Items]      
Assets 2,496,286   2,412,971
Exploration and Production [Member]      
Segment Reporting Information [Line Items]      
Assets 974,023   969,808
Corporate [Member]      
Segment Reporting Information [Line Items]      
Assets $ 429,494   $ 575,785