Stock-Based Compensation (Stock Option Activity) (Details) - Stock options [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Shares outstanding, beginning balance (shares)	3,337,784
Shares granted (shares)	462,917
Shares exercised (shares)	(90,496)
Shares forfeited (shares)	(271,537)
Shares expired (shares)	(18,283)
Shares outstanding, ending balance (shares)	3,420,385	3,337,784
Shares exercisable (shares)	2,357,784
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted Average Exercise Price, outstanding, beginning balance (in usd per share)	$ 6.36
Weighted Average Exercise Price, Granted (in usd per share)	4.80
Weighted Average Exercise Price, Exercised (in usd per share)	3.37
Weighted Average Exercise Price, Forfeited (in usd per share)	6.15
Weighted Average Exercise Price, Expired (in usd per share)	2.82
Weighted Average Exercise Price, outstanding, ending balance (in usd per share)	6.26	$ 6.36
Weighted Average Exercise Price, exercisable (in usd per share)	$ 6.28
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted Average Remaining Contractual Term, Outstanding	4 years 3 months 18 days	4 years 9 months 4 days
Weighted Average Remaining Contractual Term, Exercisable	3 years 9 months 4 days
Aggregate Intrinsic Value, Outstanding	$ 1,204	$ 70
Aggregate Intrinsic Value, Exercisable	$ 670
Weighted average grant date fair value, options granted (in dollars per share)	$ 2.66	$ 2.32	$ 1.80
Total intrinsic value, options exercised	$ 144	$ 0	$ 1,700