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Acquisitions - Pro Forma Financial Information (Details)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
$ / shares
Business Combinations [Abstract]  
Total Revenues | $ $ 1,045,948
Income from Continuing Operations | $ $ 55,566
Per Share Income from Continuing Operations - Basic | $ / shares $ 0.20
Per Share Income from Continuing Operations - Diluted | $ / shares $ 0.19