Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
ASSETS:
Cash and cash equivalents	$ 457,549	$ 413,251
Short-term investments	328,718	284,384
Restricted investments	4,210	0
Accounts receivable, less allowance for doubtful accounts	391,485	377,640
Inventories:
Raw materials	109,928	106,028
Work in process	114,438	131,783
Finished goods	265,858	233,186
Total inventories	490,224	470,997
Prepaid expenses	94,369	108,348
Other current assets	11,041	61,747
Total current assets	1,777,596	1,716,367
Property, plant and equipment:
Land and improvements	17,823	18,165
Buildings and leasehold improvements	276,070	282,792
Equipment	823,193	788,141
Total property, plant and equipment	1,117,086	1,089,098
Less: accumulated depreciation and amortization	(679,396)	(660,262)
Property, plant and equipment, net	437,690	428,836
Goodwill, net	495,948	500,441
Purchased intangibles, net	214,026	254,228
Other investments	719,840	389,309
Other assets	66,442	52,097
Total assets	3,711,542	3,341,278
LIABILITIES AND STOCKHOLDERS' EQUITY:
Accounts payable	122,391	128,608
Accrued payroll and employee benefits	157,857	153,426
Current maturities of long-term debt	298	265
Income and other taxes payable	29,339	35,165
Deferred revenue	29,683	26,716
Other current liabilities	101,783	102,581
Total current liabilities	441,351	446,761
Long-term debt, net of current maturities	435,707	435,710
Deferred income taxes	233,475	154,917
Other long-term liabilities	110,506	118,735
Total liabilities	$ 1,221,039	$ 1,156,123
Commitments and contingent liabilities
Stockholders' equity:
Preferred stock	$ 0	$ 0
Additional paid-in capital	300,408	271,346
Retained earnings	1,808,055	1,694,962
Accumulated other comprehensive income	382,138	218,945
Total stockholders' equity	2,490,503	2,185,155
Total liabilities and stockholders' equity	3,711,542	3,341,278
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	(12)	(12)
Treasury Class B [Member]
Stockholders' equity:
Treasury Stock, Value	$ (89)	$ (89)

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

Name:	us-gaap_AccountsPayableCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.3-4)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 3
-Subparagraph a(1)
-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 4
-Article 5