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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash Flows from Operating Activities:    
Net cash used in operating activities $ (6,774) $ (6,541)
Cash Flows from Investing Activities:    
Proceeds from sales of and distributions from companies 3,257 15,753
Acquisitions of ownership interests in companies 0 (4,476)
Advances and loans to companies (4,036) (6,429)
Repayment of advances and loans to companies 10,500 0
Decrease in marketable securities 1,410 10,268
Net cash provided by investing activities 11,131 15,116
Cash Flows from Financing Activities:    
Issuance of Company common stock, net 0 10
Tax withholdings related to equity-based awards (150) (100)
Net cash used in financing activities (150) (90)
Net change in cash, cash equivalents and restricted cash equivalents 4,207 8,485
Cash, cash equivalents and restricted cash equivalents at beginning of period 27,087 28,394
Cash, cash equivalents and restricted cash equivalents at end of period $ 31,294 $ 36,879