Stock Compensation Plans (A Summary Of The Status Of 2009 Plan) (Details) - Plan 2009 $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) $ / shares shares
Shares
Options outstanding, beginning balance (in shares) | shares	16,992,040
Granted (in shares) | shares	0
Exercised (in shares) | shares	(1,484,244)
Forfeited (in shares) | shares	(153,731)
Expired (in shares) | shares	(100,000)
Options outstanding, ending balance (in shares) | shares	15,254,065
Options exercisable, ending balance (in shares) | shares	15,071,565
Weighted- Average Exercise Price
Options outstanding, beginning balance (in USD per share) | $ / shares	$ 2.26
Granted (in USD per share) | $ / shares	0.00
Exercised (in USD per share) | $ / shares	1.68
Forfeited (in USD per share) | $ / shares	1.54
Expired (in USD per share) | $ / shares	3.20
Options outstanding, ending balance (in USD per share) | $ / shares	2.32
Options exercisable, ending balance (in USD per share) | $ / shares	$ 2.32
Weighted- Average Remaining Contractual Term (Years)
Options outstanding	3 years 7 days
Options exercisable, ending balance	2 years 11 months 23 days
Aggregate Intrinsic Value
Options outstanding | $	$ 18,578
Options exercisable, ending balance | $	$ 18,426