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Investments (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	Dec. 31, 2008	Aug. 31, 2007
Unrealized gain (loss) on investment under fair value method			$ 24,800	$ (200)
Gain (Loss) on Disposition of Assets			412	0
kaleo
Kaleo 2016 Q1 gain on contract termination excluded from other expenses	$ 0	$ 0	$ 0	18,075
Total cash invested in private company						$ 7,500
Ownership interest percentage			20.00%
Carrying value	45,000		$ 45,000		$ 20,200
Unrealized gain (loss) on investment under fair value method	$ 0	$ (1,300)	$ 24,800	$ (200)
Weighted average cost of capital			45.00%		45.00%
Basis point decrease of weighted average cost of capital assumption	5.00%		5.00%
Basis point increase of weighted average cost of capital assumption	5.00%		5.00%
Increase in fair value from five hundred point decrease in weighted average cost of capital assumption	$ 9,000		$ 9,000
Decrease in fair value from five hundred point increase in weighted average cost of capital assumption	8,000		8,000
Harbinger Fund
Cost Method Investments	1,700		1,700		$ 1,700
Alleghany and Bath County, Virginia [Member]
Cost Method Investments	$ 1,600		$ 1,600		$ 1,600

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