Stockholders' Equity and Employee Stock Option Plans Stock Award Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Equity [Abstract]
Number of Shares Available for Grant, Opening Balance	515,217	457,585	1,346,758
Options and SARS, Outstanding, Number, opening balance	259,679	410,484	393,931
Options and SARS, Outstanding opening balance, Weighted Average Exercise Price,	$ 34.00	$ 41.30	$ 60.80
Number Of Shares Available For Grant, Options ans SARS Granted	(112,600)	(46,800)	(178,572)
Options and SARS, Grants in Period	112,600	46,800	178,572
Options and SARS, Grants in Period, Weighted Average Exercise Price	$ 9.14	$ 24.60	$ 23.40
Number of shares available for grant, RSU granted	(83,555)	(219,153)	(70,266)
Number Of Shares Available For Grant, Options and SARS Canceled	86,743	197,066	162,019
Options and SARS, Forfeitures in Period	(86,743)	(197,066)	(162,019)
Options and SARS, Forfeitures in Period, Weighted Average Exercise Price	$ 32.38	$ 47.00	$ 68.90
Number of shares available for grant, RSU canceled	111,700	126,519	47,186
Options and SARS, Exercises in Period, Shares		(539)
Options and SARS, Exercises in Period, Weighted Average Exercise Price		$ 31.70
Unissued shares returned to plan		0	(1,554,243)
1998 Directors Plan shares expired			(7,500)
Number of Additional Shares Authorized			712,203
Number of Shares Available for Grant, Ending Balance	517,505	515,217	457,585
Options and SARS, Outstanding, Number, Closing balance	285,536	259,679	410,484
Options and SARS, Outstanding ending balance, Weighted Average Exercise Price	$ 24.72	$ 34.00	$ 41.30
Stockholders' Equity and Employee Stock Option Plans (Textual) [Abstract]
Options, Exercises in Period, Total Intrinsic Value	$ 0	$ 3	$ 0