Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 357,855	$ 227,574
Short-term investments	308,768	430,663
Trade accounts receivable, net	113,472	101,883
Inventories, net	151,650	152,631
Other current assets	27,388	26,760
Total current assets	959,133	939,511
Property, plant and equipment, net	67,561	68,856
Goodwill	199,999	199,703
Intangible assets, net	42,575	44,027
Other assets	21,392	21,250
Total assets	1,290,660	1,273,347
Current liabilities:
Accounts payable	28,076	23,177
Accrued compensation	20,983	28,424
Income taxes payable	3,510	4,024
Other current liabilities	45,372	35,359
Total current liabilities	97,941	90,984
Other liabilities	$ 21,650	$ 21,482
Commitments and contingencies (Note 17)
Stockholders' equity:
Preferred Stock, $0.01 par value per share, 2,000,000 shares authorized; none issued and outstanding
Common Stock, no par value, 200,000,000 shares authorized; 53,305,017 and 53,199,720 shares issued and outstanding at March 31, 2016 and December 31, 2015, respectively	$ 113	$ 113
Additional paid-in capital	745,840	744,725
Retained earnings	434,803	427,214
Accumulated other comprehensive loss	(9,687)	(11,171)
Total stockholders' equity	1,171,069	1,160,881
Total liabilities and stockholders' equity	$ 1,290,660	$ 1,273,347

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