Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
ASSETS:
Cash and cash equivalents	$ 403,006	$ 383,824
Short-term investments	415,241	371,154
Restricted investments	5,560	5,560
Accounts receivable, net	404,091	464,847
Inventories:
Raw materials	118,999	113,925
Work in process	140,917	142,589
Finished goods	331,517	338,290
Total inventories	591,433	594,804
Other current assets	173,003	156,460
Total current assets	1,992,334	1,976,649
Property, plant and equipment, at cost	1,289,367	1,305,150
Less: accumulated depreciation and amortization	(799,118)	(811,654)
Property, plant and equipment, net	490,249	493,496
Goodwill, net	500,022	506,069
Purchased intangibles, net	158,035	174,113
Other investments	3,170,820	1,027,736
Other assets	74,763	94,949
Total assets	6,386,223	4,273,012
LIABILITIES AND STOCKHOLDERS' EQUITY:
Accounts payable, accrued payroll and employee benefits	261,721	306,814
Current maturities of long-term debt and notes payable	1,721	420
Income and other taxes payable	29,585	39,941
Other current liabilities	149,394	155,521
Total current liabilities	442,421	502,696
Long-term debt, net of current maturities	438,776	434,581
Deferred income taxes	686,906	222,209
Other long-term liabilities	179,174	183,276
Total liabilities	1,747,277	1,342,762
Stockholders' equity:
Additional paid-in capital	376,595	361,231
Retained earnings	4,281,275	1,830,439
Accumulated other comprehensive income	(18,710)	738,794
Total stockholders' equity	4,638,946	2,930,250
Total liabilities and stockholders' equity	6,386,223	4,273,012
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, Value	(128)	(128)
Treasury Class B [Member]
Stockholders' equity:
Treasury Stock, Value	$ (89)	$ (89)