SHARE-BASED COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2018

SHARE-BASED COMPENSATION

Summary of entity's stock option activity

				Weighted
		Weighted		Average
		Average		Remaining	Aggregate
	Number	Exercise		Contractual	Intrinsic
	of Options	Price		Life	Value
				(In years)
Outstanding at January 1, 2016	4,114,685	$	17.53	7.7	$	76,567
Granted	1,546,532		22.64
Exercised	(564,844)		7.87
Cancelled/expired	(683,032)		27.41
Outstanding at December 31, 2016	4,413,341		19.02	7.0		11,558
Granted	4,066,735		16.43
Exercised	(1,217,320)		6.47
Cancelled/expired	(1,154,464)		25.25
Outstanding at December 31, 2017	6,108,292		18.62	8.5		25,777
Granted	411,486		21.39
Exercised	(379,194)		10.81
Cancelled/expired	(954,559)		24.13
Outstanding at December 31, 2018	5,186,025	$	18.42	8.0	$	2,910
Exercisable at December 31, 2018	2,011,169	$	18.35	7.1	$	2,910

Schedule of assumptions used to determine the valuation of granted options

	Year Ended December 31,
	2018	2017	2016
Exercise price	$20.52 - $24.29	$14.36 - $20.87	$14.40 - $36.60
Expected volatility	36.06% - 38.36%	33.44% - 36.38%	23.90% - 24.76%
Expected dividend yield	0%	0%	0%
Risk-free rate for expected term	2.33% - 2.84%	1.88% - 2.34%	1.23% - 2.06%
Expected term (in years)	6.00 - 6.25	5.00 - 6.25	6.25

Summary of restricted stock units activity

		Weighted
		Average
	Number	Grant Date
	of RSUs	Fair Value
Nonvested at January 1, 2017	—	$	—
Granted	90,718		14.65
Cancelled/expired	(24,079)		14.65
Nonvested at December 31, 2017	66,639		14.65
Granted	2,059,066		22.00
Vested and issued	(183,263)		23.46
Cancelled/expired	(73,413)		20.21
Nonvested at December 31, 2018	1,869,029	$	21.67

Summary of restricted stock awards activity

	Number	Weighted
	of Shares	Average
	Subject to	Grant Date
	Restriction	Fair Value
Nonvested at January 1, 2016	10,805	$	26.60
Granted	5,765		32.97
Vested	(10,805)		26.60
Nonvested at December 31, 2016	5,765		32.97
Granted	36,814		17.13
Vested	(8,288)		26.80
Nonvested at December 31, 2017	34,291		17.45
Granted	40,796		21.30
Vested	(31,732)		17.68
Nonvested at December 31, 2018	43,355	$	20.91