CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Operating activities:
Net income	$ 9,069	$ 4,057
Adjustment to reconcile net income to cash provided by (used in) operating activities:
Excess tax benefits from exercise or vesting of equity awards	(725)	(1,622)
Deferred income taxes	56	214
Depreciation and amortization	4,727	4,686
Stock-based compensation expense	3,432	2,852
Foreign currency transaction loss	219	395
Other non-cash items	1,241	1,713
Change in operating assets and liabilities:
Trade accounts receivable	63,200	(8,130)
Income taxes receivable and other current assets	1,604	(156)
Accounts payable and accrued expenses	(23,799)	(25,861)
Deferred revenue	6,811	4,696
Other long-term assets and liabilities	211	(618)
Cash provided by (used in) operating activities	66,046	(17,774)
Investing activities:
Purchase of marketable securities	(15,779)	(10,479)
Matured and called marketable securities	3,750	6,780
Investment in property and equipment	(1,195)	(4,267)
Cash used in investing activities	(13,224)	(7,966)
Financing activities:
Issuance of common stock for share-based compensation plans	271	293
Excess tax benefits from exercise or vesting of equity awards	725	1,622
Dividend payments to shareholders		(1,132)
Common stock repurchases for tax withholdings for net settlement of equity awards	(1,611)	(2,072)
Common stock repurchases under share repurchase programs	(3,512)	(814)
Cash used in financing activities	(4,127)	(2,103)
Effect of exchange rate on cash and cash equivalents	(2,489)	963
Net increase (decrease) in cash and cash equivalents	46,206	(26,880)
Cash and cash equivalents, beginning of period	77,525	60,353
Cash and cash equivalents, end of period	$ 123,731	$ 33,473

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Cash outflow in the form of ordinary dividends to common shareholders, generally out of earnings.

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The cash outflow from purchases of trading, available-for-sale securities and held-to-maturity securities.

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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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