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1. Significant Accounting Policies Revenue Recognition (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2018
Disaggregation of Revenue [Line Items]        
Cost of Goods and Services Sold $ 1,054,663 $ 1,066,264 $ 972,450  
Retained earnings $ 5,470,779 $ 3,722,073    
Revenue Allocation Percent To Lease Elements 3.00% 5.00%    
Deferred Revenue $ 45,800 $ 37,300    
Deferred Revenue, Period Increase (Decrease) 33,100      
Deferred Revenue, Revenue Recognized $ 24,600      
Accounting Standards Update 2014-09 [Member]        
Disaggregation of Revenue [Line Items]        
Retained earnings       $ 100