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Pro Forma Effect of Businesses Acquired (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Business Acquisition    
Revenue, as reported $ 2,720,764 $ 2,342,843
Pro forma revenue 2,720,790 2,482,059
Income from continuing operations 152,763 140,809
Pro forma income from continuing operations $ 153,386 $ 149,522
Basic earnings per share from continuing operations $ 0.49 $ 0.46
Pro forma earnings per share from continuing operations, basic (2) 0.50 0.49
Diluted earnings per share from continuing operations 0.49 0.45
Pro forma earnings per share from continuing operations, diluted (2) $ 0.49 $ 0.48
Restructuring and acquisition related expenses $ 4,054 $ 2,928
All 2018 Acquisitions [Member]    
Business Acquisition    
Revenue of purchased businesses for the period prior to acquisition 26  
Net income of purchased businesses for the period prior to acquisition, including pro forma purchase accounting adjustments 0  
Acquisition Related Costs, Net of Tax $ 623  
Effect of purchased businesses for the period prior to acquisition $ 0.00  
Business Acquisition Pro Forma Income Loss From Acquisition Related Costs, Net of Tax, Per Basic Share Effect 0.00  
Effect of purchased businesses for the period prior to acquisition 0.00  
Business Acquisition Pro Forma Income Loss From Acquisition Related Costs, Net of Tax, Per Diluted Share Effect $ 0.00  
All 2017 acquisitions [Member]    
Business Acquisition    
Revenue of purchased businesses for the period prior to acquisition   139,216
Net income of purchased businesses for the period prior to acquisition, including pro forma purchase accounting adjustments   7,470
Acquisition Related Costs, Net of Tax   $ 1,243
Effect of purchased businesses for the period prior to acquisition   $ 0.02
Business Acquisition Pro Forma Income Loss From Acquisition Related Costs, Net of Tax, Per Basic Share Effect   0.00
Effect of purchased businesses for the period prior to acquisition   0.02
Business Acquisition Pro Forma Income Loss From Acquisition Related Costs, Net of Tax, Per Diluted Share Effect   $ 0.00
Acquisition related expenses    
Business Acquisition    
Restructuring and acquisition related expenses $ 2,000 $ 3,000