Quarterly report pursuant to Section 13 or 15(d)

Summary Of Significant Accounting Policies Summary of Adoption of New Accounting Pronouncements (Details)

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Summary Of Significant Accounting Policies Summary of Adoption of New Accounting Pronouncements (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Mar. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Operating Lease, Right-of-Use Asset $ 362,568 $ 352,679 $ 0 $ 0    
Prepaid expenses and other current assets 73,850   79,500 72,788    
Operating Lease, Liability, Current 59,214 57,207 0 0    
Deferred income taxes 77,760   78,155 77,043    
Total assets 2,613,709 2,721,400 2,368,721 2,188,684    
Accrued Liabilities, Current 224,385 272,338 275,684 206,145    
Operating Lease, Liability, Noncurrent 337,832 329,865 0 0    
Income taxes payable 9,302   22,763 10,261    
Total current liabilities 479,844 626,743 572,882 383,734    
Other Liabilities, Noncurrent 15,662 14,167 45,214 51,888    
Total liabilities 893,060 1,031,087 678,408 497,331    
Retained earnings 1,723,873   1,677,920 1,629,279    
Accumulated other comprehensive loss (3,318)   (4,063) (8,949)   $ (8,887)
Total liabilities and equity $ 2,613,709 2,721,400 $ 2,368,721 2,188,684    
Accounting Standards Update 2014-09 [Member]            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Operating Lease, Liability, Current   57,207        
Total liabilities and equity   $ 352,679        
Accounting Standards Update 2017-12 [Member]            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Accumulated other comprehensive loss       $ (515) $ (515)