SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Weighted Average Shares Outstanding (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounting Policies [Abstract]
Weighted average number of shares outstanding – basic	32,642	32,559	32,142
Effect of dilutive securities:
Stock options	122	420	545
Non-vested stock and stock units	208	289	303
Weighted average number of shares outstanding – diluted	32,972	33,268	32,990
Anti-dilutive securities	114	25	117