SHAREHOLDERS' EQUITY (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019	Feb. 20, 2019	Feb. 21, 2018
Calculation of weighted average common shares
Weighted average common shares, basic	12,984,000	12,805,000		12,971,000	12,762,000
Effect of dilutive securities
Effect of stock options (in shares)	0	810,000		592,000	777,000
Effect of dilutive share awards (in shares)	0	194,000		91,000	191,000
Effect of Convertible Senior Notes (in shares)	0	1,099,000		300,000	892,000
Weighted average common shares, diluted	12,984,000	14,908,000		13,954,000	14,622,000
Antidilutive securities excluded from computation of earnings per share (in shares)	800,000
Common stock repurchases
Value of common stock authorized to be repurchased						$ 150,000	$ 100,000
Purchase of treasury stock (in shares)					17,501
Treasury Stock, Value, Acquired, Cost Method			$ 3,976		$ 4,000
Remaining authorized repurchase amount	$ 179,700			$ 179,700
Option
Effect of dilutive securities
Antidilutive securities excluded from computation of earnings per share (in shares)	700,000	100,000		200,000	100,000
Restricted Stock Units (RSUs)
Effect of dilutive securities
Antidilutive securities excluded from computation of earnings per share (in shares)	100,000