Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 642,319	$ 505,631
Investments	2,751,382	2,307,401
Accounts receivable, net	533,825	489,340
Inventories	270,294	262,682
Other current assets	72,314	70,391
Total current assets	4,270,134	3,635,445
Property, plant and equipment, net	349,278	337,118
Intangible assets, net	228,395	207,055
Goodwill	359,819	352,080
Other assets	116,728	130,361
Total assets	5,324,354	4,662,059
Current liabilities:
Notes payable and debt	100,273	125,297
Accounts payable	64,537	67,740
Accrued employee compensation	69,024	57,465
Deferred revenue and customer advances	166,840	148,837
Accrued income taxes	73,008	15,244
Accrued warranty	13,026	13,391
Other current liabilities	119,449	92,347
Total current liabilities	606,157	520,321
Long-term liabilities:
Long-term debt	1,897,501	1,701,966
Long-term portion of retirement benefits	67,334	72,568
Long-term income tax liabilities	456,949	10,458
Other long-term liabilities	62,625	54,797
Total long-term liabilities	2,484,409	1,839,789
Total liabilities	3,090,566	2,360,110
Commitments and contingencies (Notes 5, 8, 9, 10, 11 and 15)
Stockholders' equity:
Preferred stock, par value $0.01 per share, 5,000 shares authorized, none issued at December 31, 2017 and December 31, 2016	0	0
Common stock, par value $0.01 per share, 400,000 shares authorized, 159,845 and 158,634 shares issued, 79,337 and 80,023 shares outstanding at December 31, 2017 and December 31, 2016, respectively	1,598	1,586
Additional paid-in capital	1,745,088	1,607,241
Retained earnings	5,405,380	5,385,069
Treasury stock, at cost, 80,509 and 78,611 shares at December 31, 2017 and December 31, 2016, respectively	(4,808,211)	(4,475,667)
Accumulated other comprehensive loss	(110,067)	(216,280)
Total stockholders' equity	2,233,788	2,301,949
Total liabilities and stockholders' equity	$ 5,324,354	$ 4,662,059

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).

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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.