STOCK-BASED COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2016

STOCK-BASED COMPENSATION [Abstract]

Summary of Additional Information Concerning Restricted Stock Units

The following table summarizes additional information concerning restricted stock units at December 31, 2016:

	Restricted Stock Units		Weighted Average Grant Date Fair Value Per Unit
Unvested as of December 31, 2015	732,756		$	21.37
Granted	393,532		22.05
Vested	(214,671	)	22.01
Dividends reinvested	73,888		22.07
Cancelled/Forfeited	(81,538	)	21.13
Unvested as of December 31, 2016	903,967		$	21.58

Summary of Assumptions used in Total Stockholder Return-Based Stock Units Valuation

	2016		2015		2014
Risk Free Interest Rate	0.78% - 1.60%		0.87% - 1.31%		1.07% - 1.09%
Expected Stock Price Volatility	27.40% - 28.42%		23.55% - 27.02%		24.14% - 24.22%
Expected Service Period	2.3 - 3.0 years		2.5 - 3.0 years		3.0 years
Expected Dividend Yield (assuming full reinvestment)	—	%	—	%	—	%