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4. Supplemental Cash Flow Information - (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Supplemental Cash Flow Elements [Abstract]    
Net Income Attributable to Parent $ 977,414 $ 685,912
Share-based Compensation 11,700 9,700
(Gain) Loss on Sale of Securities, Net (100) (400)
Other than temporary impairment losses on investments 800 0
Changes in fair market value of equity securities (1,179,400) (827,700)
Loss on Disposition of Property Plant Equipment 300 100
Changes in fair value of contingent consideration 0 (100)
Decrease in accounts receivable 1,300 2,200
Decrease (increase) in inventories 5,800 (13,700)
Increase in other current assets (37,500) (9,500)
Decrease in accounts payable and other current liabilities (44,500) (25,600)
Increase in income taxes payable 27,300 20,900
Increase in deferred income taxes 274,800 171,800
Increase in other long term liabilities 43,800 15,700
Reduction in the carrying amount of right-of-use assets 9,800 9,600
Depreciation and amortization 32,700 33,600
Other (700) (400)
Payments of operating lease liabilities (9,900) (9,300)
Net cash provided by operating activities 113,610 62,808
Noncash or Part Noncash Acquisition, Investments Acquired 0 2,700
Noncash or Part Noncash Acquisition, Fixed Assets Acquired $ 4,700 $ 6,000