Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Operating activities:
Net income	$ 5,967us-gaap_NetIncomeLoss	$ 6,255us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	605	458
Stock-based compensation expense	2,199us-gaap_ShareBasedCompensation	1,660us-gaap_ShareBasedCompensation
Amortization of acquired intangible assets		18us-gaap_AmortizationOfIntangibleAssets
Deferred taxes	416us-gaap_DeferredIncomeTaxExpenseBenefit	1,886us-gaap_DeferredIncomeTaxExpenseBenefit
Loss on sale/disposal of property and equipment		34us-gaap_GainLossOnDispositionOfAssets
Purchases of treasury stock in connection with tax withholdings on restricted stock grants	(2)	(8)
Reversal of allowance for doubtful accounts	(82)us-gaap_ProvisionForDoubtfulAccounts	(28)us-gaap_ProvisionForDoubtfulAccounts
Unrealized loss on foreign currency forward contract	84us-gaap_UnrealizedGainLossOnDerivatives	24us-gaap_UnrealizedGainLossOnDerivatives
Tax benefit related to stock-based compensation expense	1,858	44
Excess tax benefit from stock-based compensation	(1,754)	(41)
Changes in operating assets and liabilities:
Accounts receivable	8,615	2,373
Prepaid expenses and other assets	(315)	(264)
Accounts payable	(988)	(279)
Accrued compensation and related benefits	(2,024)	(2,386)
Accrued and other liabilities	(415)	(442)
Deferred revenues	1,455	2,537
Billings in excess of recognized revenues		248
Net cash provided by operating activities	15,619	12,089
Investing activities:
Purchases of property and equipment	(1,145)	(929)
Net cash used in investing activities	(1,145)	(929)
Financing activities:
Proceeds from exercise of stock options	3,128	784
Proceeds from employee stock purchase plan	680us-gaap_ProceedsFromStockPlans	632us-gaap_ProceedsFromStockPlans
Excess tax benefit from stock-based compensation	1,754	41
Purchases of treasury stock	(3,605)	(968)
Net cash provided by financing activities	1,957	489
Effect of exchange rate changes on cash and cash equivalents	(15)	(26)
Net change in cash and cash equivalents	16,416	11,623
Cash and cash equivalents, beginning of period	115,464	89,371
Cash and cash equivalents, end of period	131,880	100,994
Cash paid during the period for:
Taxes	1,941us-gaap_IncomeTaxesPaid	1,648us-gaap_IncomeTaxesPaid
Property and equipment received and accrued in accounts payable and accrued and other liabilities	$ 749	$ 400

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+ References

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Name:	us-gaap_UnrealizedGainLossOnDerivatives
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration