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Consolidated Statements of Cash Flows Statement (USD $) | 6 Months Ended
--- | ---
Jun. 30, 2013 | Jun. 30, 2012
Payments of Dividends | $ (6,149,000) | $ 0
Patent acquisition costs included in accrued expenses | 8,508,000 | 10,200,000
Cash flows from operating activities: |  |
Net income (loss) including noncontrolling interests in operating subsidiaries | (8,367,000) | 56,034,000
Adjustments to reconcile net income including noncontrolling interests in operating subsidiaries to net cash provided by operating activities: |  |
Depreciation and amortization | 24,405,000 | 10,585,000
Non-cash stock compensation | 11,426,000 | 11,090,000
Excess tax benefits from stock-based compensation | 847,000 | 10,850,000
Change in valuation allowance | 0 | (10,237,000)
Other | 0 | 49,000
Changes in assets and liabilities: |  |
Accounts receivable | (6,938,000) | (7,907,000)
Prepaid expenses and other assets | (5,863,000) | (271,000)
Accounts payable and accrued expenses / costs | 7,362,000 | 13,795,000
Royalties and contingent legal fees payable | 7,478,000 | (4,405,000)
Deferred income tax | (10,552,000) | 5,522,000
Net cash provided by operating activities | 18,104,000 | 63,405,000
Cash flows from investing activities: |  |
Purchases of property and equipment | (365,000) | (188,000)
Purchase of available-for-sale investments | (175,042,000) | (239,952,000)
Maturities and sale of available-for-sale investments | 93,809,000 | 117,462,000
Purchase of ADAPTIX, Inc., net of cash acquired | 0 | (150,000,000)
Patent acquisition costs | (6,260,000) | (40,435,000)
Net cash used in investing activities | (87,858,000) | (313,113,000)
Cash flows from financing activities: |  |
Proceeds from sale of common stock, net of issuance costs | 0 | 218,983,000
Contributions from noncontrolling interests in operating subsidiary | 1,920,000 | 1,920,000
Excess tax benefits from stock-based compensation | 847,000 | 10,850,000
Proceeds from exercises of stock options | 241,000 | 88,000
Net cash provided by financing activities | (3,141,000) | 231,841,000
Decrease in cash and cash equivalents | (72,895,000) | (17,867,000)
Cash and cash equivalents, beginning | 221,804,000 | 314,733,000
Cash and cash equivalents, ending | $ 148,909,000 |

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