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Consolidated Statements of Cash Flows Statement (USD $) In Thousands, unless otherwise specified | 6 Months Ended
--- | ---
Jun. 30, 2012 | Jun. 30, 2011
Cash flows from operating activities: |  |
Net income including noncontrolling interests in operating subsidiaries | $ 56,034 | $ 15,395
Adjustments to reconcile net income including noncontrolling interests in operating subsidiaries to net cash provided by operating activities: |  |
Depreciation and amortization | 10,585 | 6,418
Non-cash stock compensation | 11,090 | 6,323
Change in valuation allowance | (10,237) | 0
Other | 49 | (9)
Changes in assets and liabilities: |  |
Accounts receivable | (7,907) | (12,379)
Prepaid expenses and other assets | (271) | (63)
Accounts payable and accrued expenses / costs | 2,945 | (497)
Royalties and contingent legal fees payable | (4,405) | 9,931
Deferred income tax | (5,522) | 0
Net cash provided by operating activities | 63,405 | 25,119
Cash flows from investing activities: |  |
Purchases of property and equipment | (188) | (88)
Purchase of available-for-sale investments | (239,952) | 0
Maturities and sale of available-for-sale investments | 117,462 | 35
Purchase of ADAPTIX, Inc., net of cash acquired | (150,000) | 0
Patent acquisition costs | (40,435) | (1,805)
Net cash used in investing activities | (313,113) | (1,858)
Cash flows from financing activities: |  |
Proceeds from sale of common stock, net of issuance costs | 218,983 | 175,232
Distributions to noncontrolling interests in operating subsidiary | 0 | (2,897)
Contributions from noncontrolling interests in operating subsidiary | 1,920 | 877
Excess tax benefits from stock-based compensation | 10,850 | 23
Proceeds from exercises of stock options | 88 | 404
Net cash provided by financing activities | 231,841 | 173,639
(Decrease) increase in cash and cash equivalents | (17,867) | 196,900
Cash and cash equivalents, beginning | 314,733 | 102,515
Cash and cash equivalents, ending | 296,866 | 299,415
Supplemental schedule of noncash investing activities: |  |
Patent acquisition costs included in accrued expenses / costs | $ 10,000 | $ 0

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