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Principles of Consolidation and Basis of Presentation New Accounting Pronouncements and Changes in Accounting Principles (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Decrease in operating income - Labor and benefits expense $ 175,853 $ 169,576 $ 539,407 $ 500,936
Other income/(loss), net $ 1,515 1,868 (237) 4,519
United States Tax Cuts and Jobs Act 2017, Reclassification from AOCL to Retained Earnings     0  
AOCL Attributable to Parent [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
United States Tax Cuts and Jobs Act 2017, Reclassification from AOCL to Retained Earnings     2,970  
ASU 2017-07 [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Decrease in operating income - Labor and benefits expense   1,600   4,800
Other income/(loss), net   $ (1,600)   $ (4,800)
Adjustments for New Accounting Principle, Early Adoption [Member] | AOCL Attributable to Parent [Member] | ASU 2018-02 [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
United States Tax Cuts and Jobs Act 2017, Reclassification from AOCL to Retained Earnings     2,970  
Adjustments for New Accounting Principle, Early Adoption [Member] | Retained Earnings [Member] | ASU 2018-02 [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
United States Tax Cuts and Jobs Act 2017, Reclassification from AOCL to Retained Earnings     $ (2,970)