Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
ASSETS:
Cash and cash equivalents	$ 603,551	$ 660,672
Short-term investments	433,150	453,973
Restricted investments	5,560	5,560
Accounts receivable, net	380,476	392,672
Inventories:
Raw materials	104,017	109,570
Work in process	144,331	146,131
Finished goods	308,681	298,306
Total inventories	557,029	554,007
Prepaid expenses	94,787	102,331
Other current assets	8,034	10,940
Total current assets	2,082,587	2,180,155
Property, plant and equipment	1,361,722	1,382,172
Less: accumulated depreciation and amortization	(875,548)	(882,833)
Property, plant and equipment, net	486,174	499,339
Operating lease right-of-use assets	200,487	201,868
Goodwill, net	264,131	264,131
Purchased intangibles, net	138,317	145,525
Other investments	5,434,760	4,638,205
Other assets	77,903	79,636
Total assets	8,684,359	8,008,859
LIABILITIES AND STOCKHOLDERS' EQUITY:
Accounts payable, accrued payroll and employee benefits	118,221	107,014
Accrued payroll and employee benefits	130,202	180,084
Current maturities of long-term debt and notes payable	426,308	426,172
Income and other taxes payable	32,298	36,285
Current operating lease liabilities	34,440	35,365
Other current liabilities	127,785	120,575
Total current liabilities	869,254	905,495
Long-term debt, net of current maturities	12,205	13,579
Deferred Income Tax Liabilities, Net	1,161,112	997,787
Operating lease liabilities	175,452	176,018
Other long-term liabilities	173,257	160,923
Total liabilities	2,391,280	2,253,802
Stockholders' equity:
Additional paid-in capital	423,742	410,020
Retained earnings	6,156,691	5,470,779
Accumulated other comprehensive loss	(148,955)	(87,348)
Total stockholders' equity	6,293,079	5,755,057
Total liabilities and stockholders' equity	8,684,359	8,008,859
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	$ (138,402)	$ (38,397)