SHARE-BASED COMPENSATION - Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Options
Outstanding, beginning of period (in shares)	21,567
Granted (in shares)	0	0	0
Exercised (in shares)	(1,250)	(2,500)	(33,375)
Expired (in shares)	(19,067)
Forfeited (in shares)	0
Outstanding, end of period (in shares)	1,250	21,567
Exercisable (in shares)	1,250	21,567
Weighted-Average Exercise Price
Outstanding, beginning of period (in dollars per share)	$ 20.67
Granted (in dollars per share)	0
Exercised (in dollars per share)	15.56
Expired (in dollars per share)	21.04
Forfeited (in dollars per share)	0
Outstanding, end of period (in dollars per share)	20.20	$ 20.67
Exercisable (in dollars per share)	$ 20.20	$ 20.67
Outstanding, aggregate intrinsic value	$ 2
Exercisable, aggregate intrinsic value	$ 2
Outstanding, remaining contractual term	3 months 29 days
Exercisable, remaining contractual term	3 months 29 days

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.