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EARNINGS PER SHARE - Stock Buyback (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2018	Dec. 18, 2019	May 03, 2018	Sep. 16, 2015
EARNINGS PER SHARE
Authorized amount	$ 38,400				$ 150,000
Authorized program period repurchase	30 months
Authorized amount increase			$ 25,100	$ 50,000
Amount paid to repurchase shares	$ 11,630	$ 95,125
Number of shares repurchased	244	1,696
Average repurchase price per share	$ 47.75	$ 56.07

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Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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