Stock Compensation (Summary Of Stock Option Activity) (Details) - Stock Options [Member] - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, Beginning Balance, Shares	1,896,000	2,021,000	1,794,000
Granted, Shares	387,000	328,000	562,000
Exercised, Shares	(372,000)	(248,000)	(297,000)
Forfeited, Shares		(112,000)	(23,000)
Expired, Shares		(93,000)	(15,000)
Outstanding, Ending Balance, Shares	1,911,000	1,896,000	2,021,000	1,794,000
Vested and expected to vest, Shares	1,872,000
Exercisable, Shares	1,193,000
Outstanding, Beginning Balance, Weighted Average Exercise Price	$ 7.65	$ 7.43	$ 6.57
Granted, Weighted Average Exercise Price	10.34	10.83	10.12
Exercised, Weighted Average Exercise Price	5.60	7.42	7.26
Forfeited, Weighted Average Exercise Price		9.93	7.97
Expired, Weighted Average Exercise Price		12.08	7.34
Outstanding, Ending Balance, Weighted Average Exercise Price	8.59	$ 7.65	$ 7.43	$ 6.57
Vested and expected to vest, Weighted Average Exercise Price	8.55
Exercisable, Weighted Average Exercise Price	$ 7.50
Outstanding, Weighted Average Remaining Contractual Term in years	3 years 6 months 18 days	3 years 3 months 22 days	3 years 6 months 15 days	3 years 3 months 22 days
Vested and expected to vest, Weighted Average Remaining Contractual Term in Years	3 years 6 months 4 days
Exercisable, Weighted Average Remaining Contractual Term in years	2 years 3 months 29 days
Outstanding, Aggregate Intrinsic Value	$ 20,179,000	$ 5,992,000	$ 8,021,000	$ 8,274,000
Vested and expected to vest, Aggregate Intrinsic Value	19,843,000
Exercisable, Aggregate Intrinsic Value	$ 13,904,000