Stock-Based Compensation (Summary Of Stock Options Under The 2007 Plan) (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) $ / shares shares
Shares
Options outstanding, beginning balance (in shares) | shares	63,000
Granted (in shares) | shares	0
Exercised (in shares) | shares	0
Forfeited and expired (in shares) | shares	0
Options outstanding, ending balance (in shares) | shares	63,000
Vested and expected to vest as of December 31, 2018 (in shares) | shares	63,000
Exercisable as of December 31, 2018 (in shares) | shares	63,000
Weighted average exercise price
Options outstanding, beginning balance (usd per share) | $ / shares	$ 62.86
Granted (usd per share) | $ / shares	0
Exercised (usd per share) | $ / shares	0
Forfeited and expired (usd per share) | $ / shares	0
Options outstanding, ending balance (usd per share) | $ / shares	62.86
Vested and expected to vest as of December 31, 2018 (usd per share) | $ / shares	62.86
Exercisable as of December 31, 2018 (usd per share) | $ / shares	$ 62.86
Additional Disclosures
Options outstanding, weighted average remaining contractual term (years)	1 year 9 months 18 days
Vested and expected to vest, weighted average remaining contractual term (years)	1 year 9 months 18 days
Exercisable, weighted average remaining contractual term (years)	1 year 9 months 18 days
Options outstanding, aggregate intrinsic value | $	$ 4,640
Vested and expected to vest, aggregate intrinsic value | $	4,640
Exercisable, aggregate intrinsic value | $	$ 4,640