SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Adoption of Recent Accounting Pronouncements - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019	Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification of stranded tax effects		$ (6,658)
Retained earnings			$ 1,643,825		$ 1,523,820
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification of stranded tax effects	$ 6,700	$ 6,658
Accounting Standards Update 2016-13 | Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings				$ (1,400)
Accounting Standards Update 2014-09 | Adjustment/Effect of Change
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings						$ 2,900