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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Cash Flows from Operating Activities:    
Net cash used in operating activities $ (12,778) $ (11,540)
Cash Flows from Investing Activities:    
Proceeds from sales of and distributions from companies and funds 81,203 1,403
Acquisitions of ownership interests in companies and funds (25,406) (15,131)
Advances and loans to companies (7,618) (8,100)
Repayment of advances and loans to companies 4,097 928
Origination fees on mezzanine loans 0 42
Increase in marketable securities (23,874) (29,913)
Decrease in marketable securities 34,444 92,552
Capital expenditures (11) (21)
Other 5 6,434
Net cash provided by investing activities 62,840 48,194
Cash Flows from Financing Activities:    
Issuance of Company common stock, net 573 92
Repurchase of convertible senior debentures (441) (43)
Repurchase of Company common stock (25,036) 0
Net cash provided by (used in) financing activities (24,904) 49
Net change in cash and cash equivalents 25,158 36,703
Cash and cash equivalents at beginning of period 139,318 66,029
Cash and cash equivalents at end of period $ 164,476 $ 102,732