Share-Based Compensation (Narrative) (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) $ / shares shares	Mar. 31, 2017 USD ($) $ / shares	May 04, 2018 shares	May 07, 2015 shares	May 31, 2012 shares	May 31, 2005 shares
Nonemployee director annual stock grants	25,000
Stock or Unit Option Plan Expense | $	$ 1,425	$ 1,523
Unrecognized compensation cost | $	$ 1,707
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares	$ 4.49	$ 5.75
2012 Plan [Member]
Shares available for grants	391,668			3,000,000	1,500,000
Stock Option Plan, Award Vesting Period	5 years
Common stock on date granted term period, years	10
Prior To Shareholder Approval of Increase [Member]
Nonemployee director annual stock grants	15,000
Prior To Shareholder Approval of Second Amendment [Member]
Nonemployee director annual stock grants	20,000
2005 Plan [Member]
Shares available for grants						1,500,000
Stock Option Plan, Award Vesting Period	10 years
Common stock on date granted term period, years	10
Expected To Be Recognized During 2015 [Member]
Unrecognized compensation cost | $	$ 1,105
Expected To Be Recognized During 2016 [Member]
Unrecognized compensation cost | $	542
Expected To Be Recognized During 2017 [Member]
Unrecognized compensation cost | $	$ 60
Subsequent Event [Member] | 2012 Plan [Member]
Shares available for grants			3,500,000