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Acquisitions and Other Investments - Pinnacle Actual and Pro Forma Financial Results (Details) - Pinnacle - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Actual financial results of acquiree since acquisition date    
Revenues $ 385,863  
Net income 4,664  
Pro forma financial results    
Revenues 5,069,425 $ 5,036,559
Net income (loss) $ 83,155 $ (38,045)