Other Income (Loss), net Other Income (Loss), net - Schedule of Other Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Other Income and Expenses [Abstract]
Gain on fair value of prior equity interests									$ 0	$ 0	$ 0
Gain (loss) on sales/distributions of ownership interests									1,523	5,158	(4,032)
Realized gains on sales of marketable securities									10	269	23
Other									0	0	(93)
Total other income (loss) for parent company									1,533	5,427	(4,102)
Total other loss for consolidated businesses									159	(127)	(108)
Total other income (loss), net	$ 204	$ 52	$ (101)	$ 1,537	$ 4,280	$ 83	$ 637	$ 300	$ 1,692	$ 5,300	$ (4,210)