EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Numerator
Income available to common stockholders, Diluted	$ 55,276	$ 41,839	$ 139,228	$ 97,092
Income available to common stockholders, Basic	$ 55,276	$ 41,839	$ 139,228	$ 97,092
Denominator (Shares)
Basic (in shares)	65,818	64,262	65,525	64,135
Effect of dilutive stock-based compensation
Diluted (in shares)	68,086	66,384	67,869	66,246
Per Share Amount
Diluted (in dollars per share)	$ 0.81	$ 0.63	$ 2.05	$ 1.47
Basic (in dollars per share)	$ 0.84	$ 0.65	$ 2.12	$ 1.51
Options
Effect of dilutive stock-based compensation
Incremental common shares attributable to dilutive effect of share-based payment arrangements (in shares)	1,727	1,661	1,804	1,734
Restricted Stock Units
Effect of dilutive stock-based compensation
Incremental common shares attributable to dilutive effect of share-based payment arrangements (in shares)	541	461	540	377