SHARE REPURCHASE - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands				12 Months Ended
	Dec. 23, 2020	Feb. 25, 2019	Jun. 04, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share Repurchase [Line Items]
Purchase of company stock				$ 0	$ 0	$ 181,402
2021 Stock Repurchase Program [Member]
Share Repurchase [Line Items]
Stock repurchase program, authorized amount	$ 100,000
Stock repurchase program, expiration date	Dec. 31, 2021
2019 Stock Repurchase Program [Member]
Share Repurchase [Line Items]
Stock repurchase program, authorized amount		$ 100,000
Stock repurchase program, expiration date		Mar. 01, 2020
KKR Share Repurchase [Member]
Share Repurchase [Line Items]
Percentage of Shares Outstanding			7.10%
Purchase of company stock			$ 181,400
Discounted Closing Stock Price			$ 73.96
Percentage of Closing Stock Price			96.00%
Shares repurchased (shares)			2,418,304