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SHAREHOLDERS' EQUITY - Share repurchase activities (Details) - Common shares - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Treasury Shares [Line Items]
Total shares (in shares)	194	176	200
Total cost	$ 10,382	$ 10,165	$ 10,080
Average price per share (in usd per share)	$ 53.43	$ 57.66	$ 50.40
In the open market:
Treasury Shares [Line Items]
Total shares (in shares)	0	0	0
Total cost	$ 0	$ 0	$ 0
Average price per share (in usd per share)	$ 0	$ 0	$ 0
From employees:
Treasury Shares [Line Items]
Total shares (in shares)	194	176	200
Total cost	$ 10,382	$ 10,165	$ 10,080
Average price per share (in usd per share)	$ 53.43	$ 57.66	$ 50.40

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Total cost of shares repurchased divided by the total number of shares repurchased.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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