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v3.7.0.1

Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Cash flows from operating activities: |  |  |
Net income (loss) including noncontrolling interests in operating subsidiaries | $ (54,799) | $ (157,478) | $ (66,662)
Adjustments to reconcile net income (loss) including noncontrolling interests in operating subsidiaries to net cash provided by (used in) operating activities: |  |  |
Depreciation and amortization | 34,355 | 53,289 | 54,049
Non-cash stock compensation | 9,062 | 11,048 | 18,115
Provision for deferred income taxes | 0 | 0 | (1,736)
Impairment of Patent-Related Intangible Assets | 42,340 | 74,731 | 3,497
Impairment of Goodwill | 0 | 30,149 | 0
Other | (477) | (109) | (28)
Changes in assets and liabilities: |  |  |
Increase (Decrease) in Restricted Cash | (787) | (10,725) | 0
Accounts receivable | 6,750 | (13,332) | (13,827)
Prepaid expenses and other assets | 1,593 | (619) | 3,154
Accounts payable and accrued expenses / costs | (3,006) | 2,570 | 3,718
Royalties and contingent legal fees payable | (970) | 527 | 3,904
Net cash provided by (used in) operating activities | 34,061 | (9,949) | 4,184
Cash flows from investing activities: |  |  |
Purchase of property and equipment | (4) | (8) | (109)
Purchase of available-for-sale investments | (62,633) | (23,296) | (109,963)
Sale of available-for-sale investments | 43,232 | 82,115 | 182,115
Patent acquisition costs | (1,225) | (19,504) | (42,746)
Payments to Acquire Investments | (20,000) | 0 | 0
Net cash provided by (used in) investing activities | (40,630) | 39,307 | 29,297
Cash flows from financing activities: |  |  |
Payments of Dividends | 0 | (25,434) | (25,039)
Distributions to noncontrolling interests in operating subsidiary | (1,358) | (4,105) | (867)
Proceeds from the exercise of stock options | 326 | 938 | 206
Repurchases of common stock | (82) | 0 | 0
Net cash provided by (used in) financing activities | (1,114) | (28,601) | (25,700)
Increase in cash and cash equivalents | (7,683) | 757 | 7,781
Cash and cash equivalents, beginning | 135,223 | 134,466 | 126,685
Cash and cash equivalents, ending | 127,540 | 135,223 | 134,466
Patent acquisition costs included in accrued expenses | $ 0 | $ 1,000 | $ 16,700

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- Definition Amount of increase (decrease) 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=75116654&loc=d3e32123-109318 + Details
Name: | us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration