SHAREHOLDERS' EQUITY (Details) - USD ($) shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Jul. 24, 2020	Feb. 28, 2019	Feb. 28, 2018
Calculation of weighted average common shares
Weighted average common shares, basic	13,243	12,984	13,157	12,971
Effect of dilutive securities
Effect of stock options (in shares)	394	0	523	592
Effect of dilutive share awards (in shares)	72	0	103	91
Effect of Convertible Senior Notes (in shares)	10	0	130	300
Weighted average common shares, diluted	13,719	12,984	13,913	13,954
Antidilutive securities excluded from computation of earnings per share (in shares)		800
Common stock repurchases
Value of common stock authorized to be repurchased						$ 150.0	$ 100.0
Remaining authorized repurchase amount	$ 179.7		$ 179.7
2025 Convertible Notes | Convertible Debt
Effect of dilutive securities
Stated interest rate					0.50%
Option
Effect of dilutive securities
Antidilutive securities excluded from computation of earnings per share (in shares)	900	700	400	200
Restricted Stock Units (RSUs)
Effect of dilutive securities
Antidilutive securities excluded from computation of earnings per share (in shares)	200	100