EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Earning per share
Authorized common stock (in shares)	199,000		199,000
Common stock, par value (in dollars per share)	$ 0.01		$ 0.01
Income (Numerator)
Income available to common stockholders, basic (in dollars)	$ 55,253	$ 63,004
Income available to common stockholders, diluted (in dollars)	$ 55,253	$ 63,004
Shares (Denominator)
Basic (in shares)	64,009	62,964
Total average equivalent shares	66,111	65,349
Per Share Amount
Net income per share, basic (in dollars per share)	$ 0.86	$ 1.00
Net income per share, diluted (in dollars per share)	$ 0.84	$ 0.96
Stock options
Shares (Denominator)
Effect of dilutive stock based compensation (in shares)	1,810	2,222
Restricted stock units
Shares (Denominator)
Effect of dilutive stock based compensation (in shares)	292	163