Stockholders' Equity (Narrative) (Details) - USD ($)		3 Months Ended		12 Months Ended
	Oct. 19, 2015	Mar. 31, 2016	Jun. 30, 2010	Dec. 31, 2008	Dec. 31, 2015	Jan. 25, 2008
Embedded derivative liabilities		$ 2,600,000			$ 1,161,000
Shares authorized for repurchase (in shares)						1,000,000
Total number of shares purchased (in shares)			223,051	491,572
Payments for shares purchased			$ 5,200,000	$ 11,500,000
Maximum number of shares that may yet be purchased		285,377
Preferred dividend payment, description		On October 19, 2015 and January 19, 2016, we announced that our Board of Directors declared that we would not be paying the cumulative dividend payments scheduled for October 30, 2015 and January 30, 2016 related to our Series A and Series B Preferred Stock. Because we did not pay our preferred stock dividends for two periods, the per annum rate increased on January 31, 2016 by 2.00% per $100.00 stated liquidation preference, or $2.00 per annum.
If Preferred Stock Dividends Not Paid For Two Periods [Member]
Preferred stock, liquidation preference per share	$ 2.00
Increase in preferred stock dividend rate percentage	2.00%
Preferred stock liquidation preference value	$ 100.00