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EARNINGS PER SHARE - Stock Buyback (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2020	Dec. 18, 2019	May 31, 2018
EARNINGS PER SHARE
Authorized amount	$ 150,000
Authorized program period repurchase	30 months
Authorized amount increase					$ 25,100	$ 50,000
Remaining authorized repurchase amount		$ 38,400		$ 38,400
Amount paid to repurchase shares		$ 4,331	$ 7,248	$ 11,579
Number of shares repurchased		73		243
Average repurchase price per share		$ 59.70		$ 47.70

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