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Segment Reporting (Total Assets for Reportable Segments) (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Segment Reporting Information [Line Items]    
Assets $ 13,849,447 $ 13,737,695
Eastern [Member]    
Segment Reporting Information [Line Items]    
Assets 3,055,672 3,099,283
Southern [Member]    
Segment Reporting Information [Line Items]    
Assets 3,441,079 3,952,449
Western [Member]    
Segment Reporting Information [Line Items]    
Assets 1,860,596 1,718,015
Central [Member]    
Segment Reporting Information [Line Items]    
Assets 1,956,234 1,885,468
Canada [Member]    
Segment Reporting Information [Line Items]    
Assets 2,444,922 2,490,291
Corporate [Member]    
Segment Reporting Information [Line Items]    
Assets $ 1,090,944 $ 592,189