Accounts Receivable (Allowance For Doubtful Accounts Receivable) (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Allowance For Doubtful Accounts Receivable [Line Items]
Beginning balance	$ (554,000)	$ (162,000)	$ (162,000)
Provision for bad debts on trade receivables	0	(42,000)
Accounts receivable write offs	0	$ 0	88,000
Ending balance	(566,000)		(554,000)
Trade Accounts Receivable
Allowance For Doubtful Accounts Receivable [Line Items]
Provision for bad debts on trade receivables	0		(359,000)
Other Receivable
Allowance For Doubtful Accounts Receivable [Line Items]
Provision for bad debts on trade receivables	$ (12,000)		$ (121,000)