STOCK-BASED COMPENSATION (Tables)

9 Months Ended

Sep. 30, 2019

STOCK-BASED COMPENSATION

Summary of stock option activity

				Weighted
		Weighted		Average
		Average		Remaining	Aggregate
	Number of	Exercise		Contractual	Intrinsic Value
	Shares	Price		Term (years)	(in millions)
Outstanding and exercisable, December 31, 2018	369,483	$	26.40
Exercised	348,469		26.77
Outstanding and exercisable, September 30, 2019	21,014	$	20.24	0.5	$	2.0

Summary of restricted stock activity

		Weighted
	Number of	Average Grant
	Shares	Date Fair Value
Nonvested stock at December 31, 2018	631,764	$	85.85
Granted	213,527		94.92
Vested	(274,774)		83.56
Forfeited	(92,854)		84.95
Nonvested stock at September 30, 2019	477,663	$	86.06

Summary of performance-based restricted stock unit

		Weighted
	Number of	Average Grant
	Shares	Date Fair Value
Nonvested stock at December 31, 2018	151,842	$	100.81
Granted	86,134		88.22
Vested	(69,372)		74.56
Forfeited	(36,356)		97.78
Nonvested stock at September 30, 2019	132,248	$	107.21