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Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Cash flows from operating activities: |  |  |
Net income | $ 25,574 | $ 23,010 | $ 20,507
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and asset write-offs | 8,921 | 5,359 | 3,671
Amortization of intangible assets | 2,445 | 2,562 | 3,620
Net (gains) losses from investments | 449 | (1,018) | (2,301)
Deferred income taxes | (10,385) | 15,137 | 2,356
Stock-based compensation | 5,397 | 3,642 | 4,874
Amortization of premium on investments | 2,803 | 3,321 | 2,587
Foreign currency losses | 405 | 1,290 | 1,374
Other non-cash items |  |  | 55
Changes in assets and liabilities, net of acquisitions |  |  |
Accounts receivable | 6,959 | (7,594) | (7,467)
Deferred commissions | 2,607 | 589 | (2,968)
Prepaid expenses and other current assets | 6,279 | (7,805) | (8,220)
Accounts payable | (490) | (1,898) | 1,422
Accrued expenses and other liabilities | 376 | 2,485 | 3,975
Deferred revenue | 1,807 | 16,364 | 15,172
Net cash provided by operating activities | 53,147 | 55,444 | 38,657
Cash flows from investing activities: |  |  |
Acquisitions |  | (7,531) | (1,660)
Purchases of property and equipment | (5,103) | (39,776) | (13,426)
Purchases of marketable investments | (91,421) | (113,909) | (116,280)
Proceeds from sales and maturities of marketable investments | 91,335 | 93,090 | 145,195
Change in restricted cash | 946 | 14,542 | 1,282
Other investing activity | 167 | 548 | 491
Net cash provided by (used in) investing activities | (4,076) | (53,036) | 15,602
Cash flows from financing activities: |  |  |
Dividends paid on common stock | (12,588) |  | (68,414)
Repurchases of common stock | (29,843) | (18,405) | (21,345)
Proceeds from issuance of common stock under employee equity incentive plans | 11,215 | 11,554 | 25,971
Excess tax benefits from stock-based compensation | 345 | 525 | 1,949
Payment of deferred acquisition consideration | (864) |  |
Net cash used in financing activities | (31,735) | (6,326) | (61,839)
Effect of exchange rate changes on cash and cash equivalents | 427 | (1,962) | (3,298)
Net increase (decrease) in cash and cash equivalents | 17,763 | (5,880) | (10,878)
Cash and cash equivalents, beginning of year | 81,047 | 86,927 | 97,805
Cash and cash equivalents, end of year | 98,810 | 81,047 | 86,927
Supplemental disclosure of cash flow information: |  |  |
Cash paid for income taxes | $ 7,102 | $ 5,929 | $ 16,583

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