Financial Instruments and Investments (Reconciliation) (Details) - Debt Securities - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014
Fair Value in Investment in Debt Securities [Roll Forward]
Balance at January 1		$ 1,653	$ 1,555
Net unrealized gains (losses) in fair value recognized in income on debt securities still held	[1]	(110)	98
Balance at December 31		$ 1,543	$ 1,653

[1] These amounts are reflected in the Company's statement of operations as investment and interest income.