Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flow from operating activities:
Net income	$ 126,333us-gaap_NetIncomeLoss	$ 80,513us-gaap_NetIncomeLoss	$ 90,137us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	70,206	67,974	58,686
Stock-based compensation	25,759us-gaap_ShareBasedCompensation	28,992us-gaap_ShareBasedCompensation	27,796us-gaap_ShareBasedCompensation
Tax benefit (expense) from deferred income taxes	(3,240)	(4,353)	1,853
Tax benefit from stock option plans	(1,242)	(2,407)	(2,198)
Changes in operating assets and liabilities:
Accounts receivable	(21,649)	6,820	(26,007)
Inventories	(943)us-gaap_IncreaseDecreaseInInventories	(1,563)us-gaap_IncreaseDecreaseInInventories	(36,154)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other assets	(16,864)	(1,767)	(7,037)
Accounts payable	1,989	(8,604)	23,419
Deferred revenue	14,910	6,346	21,050
Taxes, accrued benefit (expenses) and other liabilities	(149)	(2,472)	(19,029)
Net cash provided by operating activities	195,110	169,479	132,516
Cash flow from investing activities:
Capital expenditures	(44,944)	(47,796)	(89,073)
Capitalization of internally developed software	(25,781)	(14,883)	(11,721)
Additions to other intangibles	(2,834)	(5,182)	(1,890)
Acquisition, net of cash received			(25,481)
Purchases of short-term investments	(123,849)us-gaap_PaymentsToAcquireInvestments	(70,354)us-gaap_PaymentsToAcquireInvestments	(188,098)us-gaap_PaymentsToAcquireInvestments
Sales and maturities of short-term investments	89,835	80,371	238,436
Net cash used in investing activities	(107,573)	(57,844)	(77,827)
Cash flow from financing activities:
Proceeds from issuance of common stock	31,275	39,319	30,902
AWR earnout payment		(15,318)
Dividends paid	(76,287)us-gaap_PaymentsOfDividendsCommonStock	(69,776)us-gaap_PaymentsOfDividendsCommonStock	(68,401)us-gaap_PaymentsOfDividendsCommonStock
Tax benefit from stock option plans	1,242	2,407	2,198
Net cash used in financing activities	(43,770)	(43,368)	(35,301)
Net change in cash and cash equivalents	43,767	68,267	19,388
Cash and cash equivalents at beginning of period	230,263	161,996	142,608
Cash and cash equivalents at end of period	274,030	230,263	161,996
Interest	144us-gaap_InterestPaidNet	110us-gaap_InterestPaidNet	68us-gaap_InterestPaidNet
Income taxes	$ 28,003us-gaap_IncomeTaxesPaidNet	$ 10,510us-gaap_IncomeTaxesPaidNet	$ 25,059us-gaap_IncomeTaxesPaidNet

Business acquistion contingent consideration payments.

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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