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Employee Benefit Plans - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Defined Benefit Plan Disclosure [Line Items]    
Other selling and administrative expenses $ 424,617 $ 330,829
Other non-operating (income) expense, net (608) 494
Expected additional cash contributions 17,000  
Defined benefit pension plans    
Defined Benefit Plan Disclosure [Line Items]    
Cash contributions made during the period $ 2,000  
Accounting Standards Update 2017-07    
Defined Benefit Plan Disclosure [Line Items]    
Other selling and administrative expenses   (1,400)
Other non-operating (income) expense, net   $ 1,400