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Consolidated Statements of Cash Flows Statement (USD $) | 9 Months Ended
--- | ---
Sep. 30, 2013 | Sep. 30, 2012
Cash flows from operating activities: |  |
Net income (loss) including noncontrolling interests in operating subsidiaries | $ (23,853,000) | $ 49,567,000
Adjustments to reconcile net income including noncontrolling interests in operating subsidiaries to net cash provided by operating activities: |  |
Depreciation and amortization | 37,085,000 | 21,034,000
Non-cash stock compensation | 20,812,000 | 17,375,000
Excess tax benefits from stock-based compensation | (358,000) | 7,554,000
Change in valuation allowance | 0 | (10,237,000)
Other | (22,000) | 490,000
Changes in assets and liabilities: |  |
Accounts receivable | (6,969,000) | (13,720,000)
Prepaid expenses and other assets | (5,866,000) | (1,485,000)
Accounts payable and accrued expenses / costs | 6,874,000 | 10,244,000
Royalties and contingent legal fees payable | (4,195,000) | (2,030,000)
Deferred income tax | (29,043,000) | 6,546,000
Net cash provided by operating activities | (4,819,000) | 70,230,000
Cash flows from investing activities: |  |
Purchases of property and equipment | (579,000) | (200,000)
Purchase of available-for-sale investments | (232,809,000) | (305,007,000)
Maturities and sale of available-for-sale investments | 155,669,000 | 169,016,000
Purchase of ADAPTIX, Inc., net of cash acquired | 0 | (150,000,000)
Patent acquisition costs | (10,416,000) | (64,960,000)
Net cash used in investing activities | (88,135,000) | (351,151,000)
Cash flows from financing activities: |  |
Proceeds from sale of common stock, net of issuance costs | 0 | 218,983,000
Distributions to noncontrolling interests in operating subsidiary | 0 | 312,000
Payments of Dividends | (12,392,000) | 0
Contributions from noncontrolling interests in operating subsidiary | 1,920,000 | 3,840,000
Payments for Repurchase of Common Stock | (18,000) | 0
Excess tax benefits from stock-based compensation | (358,000) | 7,554,000
Proceeds from exercises of stock options | 301,000 | 274,000
Net cash provided by financing activities | (10,547,000) | 230,339,000
Decrease in cash and cash equivalents | (103,501,000) | (50,582,000)
Cash and cash equivalents, beginning | 221,804,000 | 314,733,000
Cash and cash equivalents, ending | 118,303,000 | 264,151,000
Patent acquisition costs included in accrued expenses | $ 9,750,000 | $ 8,000,000

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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of the change in the period in the valuation allowance for a specified deferred tax asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=21917399&loc=d3e32123-109318 + Details
Name: | us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration