Employee Benefit Plans (Schedule Of Stock Option Activity) (Details) - Stock Options $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of shares, beginning balance (in shares) | shares	1,879
Number of shares, granted (in shares) | shares	378
Number of shares, exercised (in shares) | shares	(289)
Number of shares, expired (in shares) | shares	(6)
Number of shares, granted, equitable adjustment, net (in shares) | shares	1,969
Number of shares, cancelled, equitable adjustment (in shares) | shares	(1,962)
Number of shares, ending balance (in shares) | shares	1,969
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Beginning Balance (in dollars per share) | $ / shares	$ 34.08
Grants (in dollars per share) | $ / shares	69.70
Exercises (in dollars per share) | $ / shares	23.76
Expired (in dollars per share) | $ / shares	21.45
Grants, equitable adjustment, net (in dollars per share) | $ / shares	25.30
Cancelled, equitable adjustment, net (in dollars per share) | $ / shares	42.50
Ending Balance (in dollars per share) | $ / shares	$ 25.30
Outstanding, Weighted Average Remaining Contractual Term	6 years 3 months 14 days
Outstanding, Intrinsic Value | $	$ 17,338
Vested and expected to vest (in shares) | shares	1,969
Vested and expected to vest, weighted average exercise price (in dollars per share) | $ / shares	$ 25.30
Vested and expected to vest, weighted average remaining contractual term	6 years 3 months 14 days
Vested and expected to vest, aggregate intrinsic value | $	$ 17,338
Exercisable (in shares) | shares	1,230
Exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 20.53
Exercisable, weighted average remaining contractual term	4 years 11 months 8 days
Exercisable, intrinsic value | $	$ 14,511