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Supplemental Cash Flow Information	12 Months Ended
Supplemental Cash Flow Information	Dec. 31, 2017
Supplemental Cash Flow Information [Abstract]
Supplemental Cash Flow Information	Supplemental Cash Flow Information During the years ended December 31, 2017 and 2016, the Company converted $10.8 million and $3.9 million, respectively, of advances to partner companies into ownership interests in partner companies. Cash paid for interest for the years ended December 31, 2017, 2016 and 2015 was $5.0 million, $2.9 million and $2.9 million, respectively. Cash paid for taxes in each of the years ended December 31, 2017, 2016 and 2015 was $0.0 million.