Consolidated Statements of Cash Flows (unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Cash flows from operating activities
Net income (loss)	$ 11,433	$ (3,138)
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	4,100	4,402
Stock-based compensation expense	5,840	6,191
Excess tax benefits from exercise of stock options	(73)	(226)
Deferred taxes	(2,819)	(9,811)
Mark to market adjustments	169	(916)
Impairment of intangible assets	0	14,980
Other	0	121
Changes in assets and liabilities, net of effect of acquisitions:
Accounts receivable, net	(13,277)	(8,901)
Prepaid expenses and other current assets	461	2,989
Accounts payable	6,871	5,870
Accrued liabilities and other liabilities	8,171	(3,061)
Net cash from operating activities	20,876	8,500
Cash flows from investing activities
Capital expenditures	(1,162)	(1,068)
Purchase of marketable securities	(7,481)	(18,182)
Maturities of marketable securities	7,651	6,699
Cash paid for business combinations, net of cash acquired	0	(9,194)
Net cash from investing activities	(992)	(21,745)
Cash flows from financing activities
Proceeds from exercise of stock options	302	682
Tax benefits realized from exercise of stock options	73	226
Cash paid for expenses in connection with initial public offering	(411)	(1,118)
Net cash from financing activities	(36)	(210)
Effect of exchange rate changes on cash and cash equivalents	(425)	465
Increase (decrease) in cash and cash equivalents	19,423	(12,990)
Cash and cash equivalents, beginning of period	35,127	34,966
Cash and cash equivalents, end of period	54,550	21,976
Cash paid during the period for:
Interest	0	0
Income taxes	$ 11,040	$ 7,331