Stockholders' Equity and Employee Stock Option Plans Stock Award Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Equity [Abstract]
Number of Shares Available for Grant, Opening Balance	517,505	515,217	457,585
Options and SARS, Outstanding, Number, opening balance	285,536	259,679	410,484
Options and SARS, Outstanding opening balance, Weighted Average Exercise Price,	$ 24.72	$ 34.00	$ 41.30
Number Of Shares Available For Grant, Options ans SARS Granted	(275,250)	(112,600)	(46,800)
Options and SARS, Grants in Period	275,250	112,600	46,800
Options and SARS, Grants in Period, Weighted Average Exercise Price	$ 5.07	$ 9.14	$ 24.60
Number of shares available for grant, RSU granted	(460,209)	(83,555)	(219,153)
Number Of Shares Available For Grant, Options and SARS Canceled	54,914	86,743	197,066
Options and SARS, Forfeitures in Period	(54,914)	(86,743)	(197,066)
Options and SARS, Forfeitures in Period, Weighted Average Exercise Price	$ 25.50	$ 32.38	$ 47.00
Number of shares available for grant, RSU canceled	29,211	111,700	126,519
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
New plan shares approved, Shares	750,000
Unissued shares eliminated from plan, Shares	(13,346)
Number of Shares Available for Grant, Ending Balance	602,825	517,505	515,217
Options and SARS, Outstanding, Number, Closing balance	505,872	285,536	259,679
Options and SARS, Outstanding ending balance, Weighted Average Exercise Price	$ 13.94	$ 24.72	$ 34.00
Stockholders' Equity and Employee Stock Option Plans (Textual) [Abstract]
Options, Exercises in Period, Total Intrinsic Value	$ 0	$ 0	$ 3