5. Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Supplemental Cash Flow Elements [Abstract]
Net Income Attributable to Parent	$ 598,810	$ 865,195	$ 268,043	$ 656,774	$ 1,464,005	$ 924,817
Depreciation and Amortization					66,100	68,700
Right-of-user asset amortization					19,800	0
Share-based Payment Arrangement, Noncash Expense					16,300	12,100
Loss on Sale of Securities, Net					0	600
Other than Temporary Impairment Losses on Investments					1,600	0
Changes in fair market value of equity securities					(1,775,600)	(1,102,300)
Gain on divestiture of a product line					0	(5,100)
Loss on Disposition of Property Plant Equipment					200	800
Gain on sale of land	$ 0		$ 0		0	(4,100)
Changes in fair value of contingent consideration					(600)	(2,400)
Payments for operating lease liabilities					(18,400)	0
Decrease in accounts receivable					14,600	52,500
Increase in inventories					(8,000)	(11,700)
Decrease (increase) in other current assets					37,600	(5,900)
Decrease in accounts payable and other current liabilities					(23,000)	(43,700)
Increase (decrease) in income taxes payable					8,600	(20,900)
Increase in deferred income taxes					395,800	246,200
Increase in other long term liabilities					4,400	6,500
Other					(5,100)	2,100
Net cash provided by operating activities					198,345	118,208
Noncash or Part Noncash Acquisition, Fixed Assets Acquired					$ 6,200	$ 7,300