Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 796,280	$ 642,319
Investments	938,944	2,751,382
Accounts receivable, net	568,316	533,825
Inventories	291,569	270,294
Other current assets	68,054	72,314
Total current assets	2,663,163	4,270,134
Property, plant and equipment, net	343,083	349,278
Intangible assets, net	246,902	228,395
Goodwill	355,614	359,819
Other assets	118,664	116,728
Total assets	3,727,426	5,324,354
Current liabilities:
Notes payable and debt	178	100,273
Accounts payable	68,168	64,537
Accrued employee compensation	64,545	69,024
Deferred revenue and customer advances	164,965	166,840
Accrued income taxes	22,943	73,008
Accrued warranty	12,300	13,026
Other current liabilities	115,832	119,449
Total current liabilities	448,931	606,157
Long-term liabilities:
Long-term debt	1,148,172	1,897,501
Long-term portion of retirement benefits	55,853	67,334
Long-term income tax liabilities	430,866	456,949
Other long-term liabilities	76,346	62,625
Total long-term liabilities	1,711,237	2,484,409
Total liabilities	2,160,168	3,090,566
Commitments and contingencies (Notes 6, 9, 10, 11, 12 and 16)
Stockholders' equity:
Preferred stock, par value $0.01 per share, 5,000 shares authorized, none issued at December 31, 2018 and December 31, 2017
Common stock, par value $0.01 per share, 400,000 shares authorized, 160,472 and 159,845 shares issued, 73,115 and 79,337 shares outstanding at December 31, 2018 and December 31, 2017, respectively	1,605	1,598
Additional paid-in capital	1,834,741	1,745,088
Retained earnings	5,995,205	5,405,380
Treasury stock, at cost, 87,357 and 80,509 shares at December 31, 2018 and December 31, 2017, respectively	(6,146,322)	(4,808,211)
Accumulated other comprehensive loss	(117,971)	(110,067)
Total stockholders' equity	1,567,258	2,233,788
Total liabilities and stockholders' equity	$ 3,727,426	$ 5,324,354

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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682