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Investments (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2008	Aug. 31, 2007
Unrealized gain (loss) on investment under fair value method	$ 3,300	$ 800
Gain (Loss) on Disposition of Assets	$ 164	0
kaleo
Kaleo 2016 Q1 gain on contract termination excluded from other expenses		17,500
Total cash invested in private company				$ 7,500
Ownership interest percentage	19.00%
Carrying value	$ 23,500		$ 20,200
Unrealized gain (loss) on investment under fair value method	$ 3,300	$ 800
Weighted average cost of capital	45.00%	45.00%
Basis point decrease of weighted average cost of capital assumption	5.00%
Basis point increase of weighted average cost of capital assumption	5.00%
Increase in fair value from five hundred point decrease in weighted average cost of capital assumption	$ 6,000
Decrease in fair value from five hundred point increase in weighted average cost of capital assumption	5,000
Harbinger Fund
Cost Method Investments	1,700		1,700
Alleghany and Bath County, Virginia [Member]
Cost Method Investments	$ 1,600		$ 1,600

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