Stockholders' Equity and Employee Stock Option Plans Stock Award Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Equity [Abstract]
Number of Shares Available for Grant, Opening Balance	602,825	517,505
Options and SARS, Outstanding, Number, opening balance	505,872	285,536
Options and SARS, Outstanding opening balance, Weighted Average Exercise Price,	$ 13.94	$ 24.72
Number Of Shares Available For Grant, Options ans SARS Granted	(20,000)	(275,250)
Options and SARS, Grants in Period	20,000	275,250
Options and SARS, Grants in Period, Weighted Average Exercise Price	$ 7.18	$ 5.07
Number of shares available for grant, RSU granted	(454,783)	(460,209)
Number Of Shares Available For Grant, Options and SARS Canceled	100,150	54,914
Options and SARS, Forfeitures in Period	(100,150)	(54,914)
Options and SARS, Forfeitures in Period, Weighted Average Exercise Price	$ 23.92	$ 25.50
Number of shares available for grant, RSU canceled	105,790	29,211
New plan shares approved, Shares		750,000
Unissued shares eliminated from plan, Shares		(13,346)
Number of Shares Available for Grant, Ending Balance	333,982	602,825
Options and SARS, Outstanding, Number, Closing balance	425,722	505,872
Options and SARS, Outstanding ending balance, Weighted Average Exercise Price	$ 11.28	$ 13.94
Stockholders' Equity and Employee Stock Option Plans (Textual) [Abstract]
Options, Exercises in Period, Total Intrinsic Value	$ 0	$ 0