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Consolidated Statements of Cash Flows Statement (USD $) | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Cash flows from operating activities: |  |
Net income (loss) including noncontrolling interests in operating subsidiaries | $ 5,113,000 | $ 49,653,000
Adjustments to reconcile net income including noncontrolling interests in operating subsidiaries to net cash provided by operating activities: |  |
Depreciation and amortization | 11,774,000 | 5,158,000
Non-cash stock compensation | 5,158,000 | 5,090,000
Excess tax benefits from stock-based compensation | 709,000 | 7,611,000
Change in valuation allowance | 0 | (10,237,000)
Changes in assets and liabilities: |  |
Accounts receivable | (35,508,000) | 1,635,000
Prepaid expenses and other assets | (1,661,000) | (919,000)
Accounts payable and accrued expenses / costs | 8,430,000 | 10,303,000
Royalties and contingent legal fees payable | 24,228,000 | (9,413,000)
Deferred income tax | 0 | 5,293,000
Net cash provided by operating activities | 16,825,000 | 48,952,000
Cash flows from investing activities: |  |
Purchases of property and equipment | (241,000) | (24,000)
Purchase of available-for-sale investments | (97,225,000) | (144,762,000)
Maturities and sale of available-for-sale investments | 53,262,000 | 20,000,000
Purchase of ADAPTIX, Inc., net of cash acquired | 0 | (150,000,000)
Patent acquisition costs | (4,010,000) | (2,100,000)
Net cash used in investing activities | (48,214,000) | (276,886,000)
Cash flows from financing activities: |  |
Proceeds from sale of common stock, net of issuance costs | 0 | 219,084,000
Contributions from noncontrolling interests in operating subsidiary | 1,920,000 | 1,920,000
Excess tax benefits from stock-based compensation | 709,000 | 7,611,000
Proceeds from exercises of stock options | 117,000 | 84,000
Net cash provided by financing activities | 2,746,000 | 228,699,000
(Decrease) increase in cash and cash equivalents | (28,643,000) | 765,000
Cash and cash equivalents, beginning | 221,804,000 | 314,733,000
Cash and cash equivalents, ending | $ 193,161,000 | $ 315,498,000

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