EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Numerator
Net Income (Loss) Available to Common Stockholders, Basic	$ 63,716	$ 56,750	$ 160,808	$ 193,669
Net Income (Loss) Available to Common Stockholders, Diluted	$ 63,716	$ 56,750	$ 160,808	$ 193,669
Denominator (Shares)
Basic (in shares)	64,562	64,010	64,278	63,485
Diluted (in shares)	66,922	66,702	66,483	66,163
Per Share Amount
Basic (in dollars per share)	$ 0.99	$ 0.89	$ 2.50	$ 3.05
Diluted (in dollars per share)	$ 0.95	$ 0.85	$ 2.42	$ 2.93
Stock options
Effect of dilutive stock-based compensation
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	1,809	2,367	1,770	2,425
Restricted stock
Effect of dilutive stock-based compensation
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	551	325	435	253