CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating activities:
Net income	$ 33,255us-gaap_NetIncomeLoss	$ 38,043us-gaap_NetIncomeLoss	$ 21,868us-gaap_NetIncomeLoss
Adjustment to reconcile net income to cash provided by operating activities:
Excess tax benefits from exercise or vesting of equity awards	(3,387)	(6,435)	(6,031)
Deferred income taxes	(13,896)	(7,008)	(6,164)
Depreciation and amortization	23,352	20,035	18,566
Amortization of investments	1,916	1,776	1,419
Stock-based compensation expense	19,205us-gaap_ShareBasedCompensation	12,869us-gaap_ShareBasedCompensation	11,506us-gaap_ShareBasedCompensation
Foreign currency transaction loss (gain)	3,769	1,593	(780)
Other non-cash	(747)us-gaap_OtherNoncashIncomeExpense	1,670us-gaap_OtherNoncashIncomeExpense	3,357us-gaap_OtherNoncashIncomeExpense
Change in operating assets and liabilities:
Trade accounts receivable	6,209	(28,316)	(33,664)
Income taxes receivable and other current assets	2,776	7,076	6,570
Accounts payable and accrued expenses	13,356	5,794	(7,656)
Deferred revenue	11,173	26,362	24,787
Other long-term assets and liabilities	2,908	7,244	9,801
Cash provided by operating activities	99,889	80,703	43,579
Investing activities:
Purchases of marketable securities	(55,520)	(60,648)	(20,204)
Proceeds from maturities and called marketable securities	33,244	27,814	24,576
Payments for acquisitions, net of cash acquired	(3,918)	(25,565)
Investment in property and equipment	(11,463)	(5,598)	(23,610)
Cash used in investing activities	(37,657)	(63,997)	(19,238)
Financing activities:
Issuance of common stock for share-based compensation plans	1,001	2,210	1,128
Excess tax benefits from exercise or vesting of equity awards	3,387	6,435	6,031
Dividend payments to shareholders	(6,874)us-gaap_PaymentsOfDividendsCommonStock	(3,421)us-gaap_PaymentsOfDividendsCommonStock	(5,680)us-gaap_PaymentsOfDividendsCommonStock
Common stock repurchases for tax withholdings for net settlement of equity awards	(6,128)	(7,345)	(4,391)
Common stock repurchases under share repurchase programs	(15,418)	(12,446)	(5,179)
Cash used in financing activities	(24,032)	(14,567)	(8,091)
Effect of exchange rate on cash and cash equivalents	(3,846)	567	922
Net increase in cash and cash equivalents	34,354	2,706	17,172
Cash and cash equivalents, beginning of year	80,231	77,525	60,353
Cash and cash equivalents, end of year	114,585	80,231	77,525
Supplemental disclosures:
Income taxes paid	14,722us-gaap_IncomeTaxesPaidNet	11,107us-gaap_IncomeTaxesPaidNet	5,106us-gaap_IncomeTaxesPaidNet
Non-cash investing and financing activity:
Dividends payable	$ 2,294us-gaap_DividendsPayableCurrent	$ 1,145us-gaap_DividendsPayableCurrent

The sum of the periodic adjustments of the differences between securities' face values and purchase prices that are charged against earnings. This is called accretion if the security was purchased at a discount and amortization if it was purchased at premium. As a noncash item, this element is an adjustment to net income when calculating cash provided by or used in operations using the indirect method.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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The total cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards, including stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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The cash inflow associated with maturities (principal being due), prepayments and calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.

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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.

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