4. Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Supplemental Cash Flow Elements [Abstract]
Net Income (Loss) Attributable to Parent	$ 268,043	$ 5,035	$ 924,817	$ 17,448
Depreciation and Amortization			68,700	70,700
Share-based Compensation			12,100	10,600
Loss on Sale of Securities, Net			600	300
Changes in fair market value of equity securities			(1,102,300)	0
Gain on divestiture of a product line			(5,100)	0
Loss on Disposition of Property Plant Equipment			800	0
Gain on sale of land	$ 0	$ 0	(4,100)	0
Changes in fair value of contingent consideration			(2,400)	(8,700)
Decrease (increase) in accounts receivable			52,500	(1,800)
Increase in inventories			(11,700)	(37,900)
Increase in other current assets			(5,900)	(14,800)
Decrease in accounts payable and other current liabilities			(43,700)	(24,200)
Decrease in Income Taxes Payable			(20,900)	(13,200)
Increase (Decrease) in Deferred Income Taxes			246,200	(3,100)
Net increase in other long-term assets/liabilities			8,600	11,000
Net cash provided by operating activities			$ 118,208	$ 6,297