STOCK-BASED COMPENSATION (Tables)

3 Months Ended

Mar. 31, 2019

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of restricted stock awards

The following table summarizes information about restricted stock awards for the three months ended March 31, 2019:

Restricted Stock	Number of Shares		Weighted Average Grant-Date Fair Value
Balance at January 1, 2019	657,240		$	54.65
Granted	42,300		61.18
Vested	(61,391	)	52.83
Forfeited	(21,870	)	54.39
Balance at March 31, 2019	616,279		54.51

Summary of performance stock awards

The following table summarizes information about performance stock awards for the three months ended March 31, 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	(14,120	)	55.69
Balance at March 31, 2019	147,374		55.69