SHARE-BASED PAYMENT (Tables)

12 Months Ended

Dec. 31, 2018

SHARE-BASED PAYMENT

Schedule of Stock Compensation Expense

Components of stock compensation expense (in thousands)	2018		2017		2016
Restricted shares	$	14,741	$	12,336	$	10,272
Stock options		1,124		1,570		1,768
2014 PSP		—		766		3,625
2016 PSP		3,411		4,728		2,812
2017 PSP		4,270		1,734		—
2018 PSP		413		—		—
Total stock compensation expense	$	23,959	$	21,134	$	18,477
Excess tax benefit recognized	$	6,848	$	9,545	$	631

Schedule of Restricted Share Activity

		Weighted-
		Average
		Grant-date
Restricted Shares Activity	Shares	Fair Value
Nonvested at January 1, 2018	1,344,523	$	26.68
Granted	434,357		52.25
Vested	(571,531)		23.75
Forfeited	(36,331)		35.32
Nonvested at December 31, 2018	1,171,018	$	37.32

Schedule of Restricted Share Units Activity

		Weighted-
		Average
		Grant-date
Restricted Share Units Activity	Share Units	Fair Value
Nonvested at January 1, 2018	861,318	$	30.89
Granted	280,237		49.72
Vested	—		—
Forfeited	(42,943)		34.94
Nonvested at December 31, 2018	1,098,612	$	35.54

Schedule of Stock Option Activity

				Weighted-
		Weighted-		Average	Aggregate
		Average		Remaining	Intrinsic
		Exercise		Contract Life	Value
Stock Options Activity	Options	Price		(Years)	(in thousands)
Outstanding at January 1, 2018	1,396,706	$	18.85
Granted	—		—
Exercised	(348,442)		16.12
Forfeited	—		—
Expired	—		—
Outstanding at December 31, 2018	1,048,264	$	19.76	5.6	$	23,685
Exercisable at December 31, 2018	904,055	$	18.04	4.9	$	21,979

Schedule of Stock Options Valuation Assumptions

Inputs into Black-Scholes Option Pricing Model	2017			2016
Estimated option life (years)		6.00			6.00
Risk free interest rate		2.04	%		1.31	%
Expected volatility		35.34	%		34.42	%
Expected dividend rate		0.00	%		0.00	%
Strike price	$	39.82		$	20.40
Weighted average grant date fair value per share of options granted	$	14.98		$	7.21