EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Earning per share
Authorized common stock (in shares)	199,000		199,000		199,000
Common stock, par value (in dollars per share)	$ 0.01		$ 0.01		$ 0.01
Income (Numerator)
Income available to common stockholders, basic (in dollars)	$ 41,839	$ 73,915	$ 97,092	$ 136,919
Income available to common stockholders, diluted (in dollars)	$ 41,839	$ 73,915	$ 97,092	$ 136,919
Shares (Denominator)
Basic (in shares)	64,262	63,471	64,135	63,219
Total average equivalent shares	66,384	66,232	66,246	65,842
Per Share Amount
Net income per share, basic (in dollars per share)	$ 0.65	$ 1.16	$ 1.51	$ 2.17
Net income per share, diluted (in dollars per share)	$ 0.63	$ 1.12	$ 1.47	$ 2.08
Stock options
Shares (Denominator)
Effect of dilutive stock based compensation (in shares)	1,661	2,533	1,734	2,411
Restricted stock units
Shares (Denominator)
Effect of dilutive stock based compensation (in shares)	461	228	377	212