SHAREHOLDERS' EQUITY (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019	Feb. 20, 2019	Feb. 21, 2018
Calculation of weighted average common shares
Weighted average common shares, basic	13,033,000	12,890,000		12,992,000	12,805,000
Effect of dilutive securities
Effect of stock options (in shares)	0	726,000		0	760,000
Effect of dilutive share awards (in shares)	0	136,000		0	176,000
Effect of Convertible Senior Notes (in shares)	0	880,000		0	888,000
Weighted average common shares, diluted	13,033,000	14,632,000		12,992,000	14,629,000
Antidilutive securities excluded from computation of earnings per share (in shares)	1,300,000			1,100,000
Common stock repurchases
Value of common stock authorized to be repurchased						$ 150,000	$ 100,000
Purchase of treasury stock (in shares)					18,580
Purchase of treasury stock		$ 310	$ 3,976		$ 4,300
Remaining authorized repurchase amount	$ 179,700			$ 179,700
Option
Effect of dilutive securities
Antidilutive securities excluded from computation of earnings per share (in shares)	100,000	100,000		200,000	100,000