WEIGHTED AVERAGE SHARES OUTSTANDING (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
Average common shares outstanding (in shares)	69,497,000	69,192,000	69,448,000	69,235,000
Common share equivalents:
Stock options (in shares)	64,000	9,000	74,000	33,000
Nonvested restricted share grants (in shares)	151,000	75,000	153,000	130,000
Performance share units (in shares)	80,000	17,000	90,000	15,000
Average common shares outstanding, assuming dilution (in shares)	69,792,000	69,293,000	69,765,000	69,413,000
Potential common shares with strike prices that would cause them to be anti-dilutive (in shares)	0	252,765	0	56,000