INCOME TAXES (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
INCOME TAXES
Income taxes	$ 21,581	$ 6,667	$ 44,601	$ 27,037
Pre-tax income	117,861	$ 33,680	$ 215,014	$ 109,605
Effective tax rate			20.70%	24.70%
Unrecognized tax benefits	18,210		$ 18,210
Unrecognized tax benefits that, if recognized, would be reflected as a component of income tax expense	14,594		14,594
Reasonably possible further reduction in prior years' unrecognized tax benefits during the next twelve months	$ 1,645		$ 1,645