STOCK-BASED COMPENSATION (Tables)

9 Months Ended

Sep. 30, 2015

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 nine months ended September 30, 2015:

Restricted Stock	Number of Shares		Weighted Average Grant-Date Fair Value
Unvested January 1, 2015	383,021		$	56.51
Granted	142,434		$	55.00
Vested	(124,822	)	$	55.85
Forfeited	(37,972	)	$	56.48
Unvested September 30, 2015	362,661		$	56.15

Summary of performance stock awards

The following table summarizes information about performance stock awards for the nine months ended September 30, 2015:

Performance Stock	Number of Shares		Weighted Average Grant-Date Fair Value
Unvested January 1, 2015	143,875		$	60.94
Granted	167,906		$	56.41
Vested	(6,129	)	$	54.28
Forfeited	(20,049	)	$	59.39
Unvested September 30, 2015	285,603		$	58.53