STOCK-BASED COMPENSATION (Tables)

9 Months Ended

Sep. 30, 2019

Share-based Payment Arrangement [Abstract]

Summary of restricted stock awards

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

Restricted Stock	Number of Shares		Weighted Average Grant-Date Fair Value
Balance at January 1, 2019	657,240		$	54.65
Granted	168,261		68.39
Vested	(230,214	)	53.97
Forfeited	(53,458	)	55.27
Balance at September 30, 2019	541,829		59.14

Summary of performance stock awards

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

Performance Stock	Number of Shares		Weighted Average Grant-Date Fair Value
Balance at January 1, 2019	213,490		$	55.71
Granted	121,075		70.53
Vested	(51,996	)	55.77
Forfeited	(27,308	)	56.53
Balance at September 30, 2019	255,261		62.64