STOCK-BASED COMPENSATION (Tables)

6 Months Ended

Jun. 30, 2016

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

Summary of total number, weighted-average grant-date fair value, and types of awards granted

The following table summarizes information about restricted stock awards for the six months ended June 30, 2016:

Restricted Stock	Number of Shares		Weighted Average Grant-Date Fair Value
Balance at January 1, 2016	362,618		$	55.79
Granted	299,967		$	51.02
Vested	(128,895	)	$	55.18
Forfeited	(16,785	)	$	57.22
Balance at June 30, 2016	516,905		$	53.12

Summary of performance stock awards

The following table summarizes information about performance stock awards for the six months ended June 30, 2016:

Performance Stock	Number of Shares		Weighted Average Grant-Date Fair Value
Balance at January 1, 2016	187,274		$	57.13
Granted	204,602		$	54.30
Vested	(8,420	)	$	61.90
Forfeited	(13,676	)	$	57.23
Balance at June 30, 2016	369,780		$	55.45