Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
ASSETS:
Cash and cash equivalents	$ 561,071	$ 431,526
Short-term investments	418,177	413,270
Restricted investments	5,560	5,560
Accounts receivable, net	356,025	392,443
Inventories:
Raw materials	112,432	108,008
Work in process	141,268	145,051
Finished goods	334,287	330,756
Total inventories	587,987	583,815
Prepaid expenses	109,584	187,249
Other current assets	9,228	9,615
Total current assets	2,047,632	2,023,478
Property, plant and equipment	1,347,364	1,326,829
Less: accumulated depreciation and amortization	(851,488)	(818,139)
Property, plant and equipment, net	495,876	508,690
Operating lease right-of-use assets	217,516	0
Goodwill, net	264,084	219,770
Purchased intangibles, net	146,965	133,123
Other investments	3,931,715	2,655,709
Other assets	73,328	70,298
Total assets	7,177,116	5,611,068
LIABILITIES AND STOCKHOLDERS' EQUITY:
Accounts payable, accrued payroll and employee benefits	249,835	265,960
Current maturities of long-term debt and notes payable	1,769	493
Income and other taxes payable	35,252	56,188
Current operating lease liabilities	33,694	0
Other current liabilities	113,490	128,154
Total current liabilities	434,040	450,795
Long-term debt, net of current maturities	437,808	438,937
Deferred income taxes	838,001	553,239
Operating lease liabilities	192,600	0
Other long-term liabilities	143,475	147,766
Total liabilities	2,045,924	1,590,737
Stockholders' equity:
Additional paid-in capital	396,432	394,342
Retained earnings	4,917,313	3,722,073
Accumulated other comprehensive loss	(152,113)	(46,958)
Total stockholders' equity	5,131,192	4,020,331
Total liabilities and stockholders' equity	7,177,116	5,611,068
Common Class A [Member]
Stockholders' equity:
Common stock	2	2
Common Class B [Member]
Stockholders' equity:
Common stock	1	1
Treasury Class A [Member]
Stockholders' equity:
Treasury stock	(30,443)	(49,040)
Treasury Class B [Member]
Stockholders' equity:
Treasury stock	$ 0	$ (89)