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Investments (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014	Dec. 31, 2008	Aug. 31, 2007
Unrealized gain (loss) on investment under fair value method			$ 0	$ 2,900
Gain (Loss) on Disposition of Assets			$ 11	919
kaleo
Total cash invested in private company						$ 7,500
Ownership interest percentage			20.00%
Carrying value	$ 39,100		$ 39,100		$ 39,100
Unrealized gain (loss) on investment under fair value method	$ 0	$ 4,000	$ 0	$ 2,900
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	$ 6,000		$ 6,000
Decrease in fair value from five hundred point increase in weighted average cost of capital assumption	5,000		5,000
Harbinger Fund
Cost-method investment, OTTI	0	200	0	$ 800
Harbinger Fund
Total withdrawal proceeds received			100	200
Cost Method Investments	1,700		1,700		1,800
Alleghany and Bath County, Virginia [Member]
Gain (Loss) on Disposition of Assets	0	$ 0	0	1,208
Gain (Loss) on Sale of Investment Property, After Tax				$ 800
Cost Method Investments	$ 2,600		$ 2,600		$ 2,600

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