STOCK-BASED COMPENSATION (Tables)

6 Months Ended

Jun. 30, 2019

Share-based Payment Arrangement [Abstract]

Summary of restricted stock awards

The following table summarizes information about restricted stock awards for the six months ended June 30, 2019:

Restricted Stock	Number of Shares		Weighted Average Grant-Date Fair Value
Balance at January 1, 2019	657,240		$	54.65
Granted	79,060		65.12
Vested	(207,032	)	53.75
Forfeited	(48,166	)	54.92
Balance at June 30, 2019	481,102		56.73

Summary of performance stock awards

The following table summarizes information about performance stock awards for the six months ended June 30, 2019:

Performance Stock	Number of Shares		Weighted Average Grant-Date Fair Value
Balance at January 1, 2019	213,490		$	55.71
Granted	—		—
Vested	(51,996	)	55.77
Forfeited	(23,554	)	55.64
Balance at June 30, 2019	137,940		55.69