EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Numerator
Income available to common stockholders, Diluted	$ 47,260	$ 63,716	$ 186,488	$ 160,808
Income available to common stockholders, Basic	$ 47,260	$ 63,716	$ 186,488	$ 160,808
Denominator (Shares)
Basic (in shares)	65,900	64,562	65,652	64,278
Effect of dilutive stock-based compensation
Diluted (in shares)	67,801	66,922	67,799	66,483
Per Share Amount
Diluted (in dollars per share)	$ 0.70	$ 0.95	$ 2.75	$ 2.42
Basic (in dollars per share)	$ 0.72	$ 0.99	$ 2.84	$ 2.50
Options
Effect of dilutive stock-based compensation
Incremental common shares attributable to dilutive effect of share-based payment arrangements (in shares)	1,464	1,809	1,688	1,770
Restricted Stock Units
Effect of dilutive stock-based compensation
Incremental common shares attributable to dilutive effect of share-based payment arrangements (in shares)	437	551	459	435