STOCK-BASED COMPENSATION (Tables)

6 Months Ended

Jun. 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 six months ended June 30, 2015:

Restricted Stock	Number of Shares		Weighted Average Grant-Date Fair Value
Unvested January 1, 2015	383,021		$	56.51
Granted	134,937		$	55.26
Vested	(112,136	)	$	56.49
Forfeited	(17,178	)	$	56.43
Unvested June 30, 2015	388,644		$	56.09

Summary of performance stock awards

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

Performance Stock	Number of Shares		Weighted Average Grant-Date Fair Value
Unvested January 1, 2015	143,875		$	60.94
Granted	165,778		$	56.51
Vested	(6,129	)	$	54.28
Forfeited	(3,923	)	$	61.02
Unvested June 30, 2015	299,601		$	58.63