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New Accounting Standards (Adoption of New Standard) (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating lease right-of-use assets $ 194,361 $ 206,501  
Total assets 13,145,772 12,833,830 $ 12,627,329
Current portion of operating lease liabilities 30,255 29,640  
Total current liabilities 942,918 890,349 860,709
Long-term portion of operating lease liabilities 170,829 180,005  
Deferred income taxes 783,609 758,967 760,033
Total liabilities 6,437,967 6,375,720 6,167,141
Retained earnings 2,452,687 2,262,432 2,264,510
Total liabilities and equity $ 13,145,772 12,833,830 $ 12,627,329
Adoption of lease guidance | ASU 2016-02      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating lease right-of-use assets   206,501  
Total assets   206,501  
Current portion of operating lease liabilities   29,640  
Total current liabilities   29,640  
Long-term portion of operating lease liabilities   180,005  
Deferred income taxes   (1,066)  
Total liabilities   208,579  
Retained earnings   (2,078)  
Total liabilities and equity   $ 206,501