STOCK-BASED COMPENSATION (Summary Of Stock Option Activity) (Details) $ / 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]
Outstanding at beginning of year (in shares) | shares	1,739
Granted (in shares) | shares	140
Exercised (in shares) | shares	(426)
Forfeited or Expired (in shares) | shares	(5)
Outstanding at end of year (in shares) | shares	1,448
Vested or expected to vest at end of year (in shares) | shares	1,448
Exercisable at end of year (in shares) | shares	1,117
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Weighted Average Exercise Price, Outstanding at beginning of year (in dollars per share) | $ / shares	$ 23.84
Weighted Average Exercise Price, Granted (in dollars per share) | $ / shares	56.23
Weighted Average Exercise Price, Exercised (in dollars per share) | $ / shares	20.57
Weighted Average Exercise Price, Forfeited or Expired (in dollars per share) | $ / shares	0.00
Weighted Average Exercise Price, Outstanding at end of year (in dollars per share) | $ / shares	27.91
Weighted Average Exercise Price, Vested or expected to vest at end of year (in dollars per share) | $ / shares	27.91
Weighted Average Exercise Price, Exercisable at end of year (in dollars per share) | $ / shares	$ 22.47
Weighted Average Contractual Term in Years, Outstanding at end of year	3 years 9 months 16 days
Weighted Average Contractual Term in Years, Vested or expected to vest at end of year	3 years 9 months 16 days
Weighted Average Contractual Term in Years, Exercisable at end of year	3 years 2 days
Aggregate Intrinsic Value, Outstanding at end of year | $	$ 26,451
Aggregate Intrinsic Value, Vested or expected to vest at end of year | $	26,451
Aggregate Intrinsic Value, Exercisable at end of year | $	$ 25,278