Share-based Compensation (Stock Option Activity) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Shares
Options outstanding at beginning of period (shares)	518
Granted (shares)	200
Exercised (shares)	(16)
Forfeited or expired (shares)	(161)
Options outstanding at end of period (shares)	541	518
Options exercisable at end of period (shares)	320
Weighted Average Exercise Price
Options outstanding, Weighted average exercise price at beginning of period (in dollars per share)	$ 16.90
Options granted, Weighted average exercise price (in dollars per share)	6.98
Options exercised, Weighted average exercise price (in dollars per share)	6.00
Options forfeited or expired, Weighted average exercise price (in dollars per share)	25.52
Options outstanding, Weighted average exercise price at end of period (in dollars per share)	11.00	$ 16.90
Options exercisable, Weighted average exercise price at end of period (in dollars per share)	$ 13.28
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Options outstanding, Weighted average remaining contractual life at beginning of period	5 years 4 months 14 days	3 years 11 months 27 days
Options exercisable, Weighted average remaining contractual life at end of period	2 years 9 months 11 days
Options outstanding, Aggregate intrinsic value at beginning of period	$ 186
Options outstanding, Aggregate intrinsic value at end of period	1,918	$ 186
Options exercisable, Aggregate intrinsic value at end of period	$ 786
Vested and expected to vest at December 31, 2017
Vested and expected to vest at end of period (shares)	541
Vested and expected to vest, Weighted average exercise price at end of period (in dollars per share)	$ 11.00
Vested and expected to vest, Weighted average remaining contractual life at end of period	5 years 4 months 14 days
Vested and expected to vest, Aggregate intrinsic value at end of period	$ 1,918