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SHAREHOLDERS' EQUITY - Share repurchase activities (Details) - Common stocks - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Treasury Shares [Line Items]
Total shares (in shares)	176	200	4,288
Total cost	$ 10,165	$ 10,080	$ 285,858
Average price per share (in usd per share)	$ 57.66	$ 50.40	$ 66.67
In the open market
Treasury Shares [Line Items]
Total shares (in shares)	0	0	3,932
Total cost	$ 0	$ 0	$ 261,180
Average price per share (in usd per share)	$ 0	$ 0	$ 66.43
From employees
Treasury Shares [Line Items]
Total shares (in shares)	176	200	356
Total cost	$ 10,165	$ 10,080	$ 24,678
Average price per share (in usd per share)	$ 57.66	$ 50.40	$ 69.36

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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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