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Acquisitions - Pro Forma Financial Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Business Combinations [Abstract]    
Total Revenues $ 1,060,823 $ 2,106,771
Income from Continuing Operations $ 92,263 $ 141,604
Per Share Income from Continuing Operations - Basic (in dollars per share) $ 0.32 $ 0.49
Per Share Income from Continuing Operations - Diluted (in dollars per share) $ 0.32 $ 0.49