BASIS OF PRESENTATION - Tax (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
BASIS OF PRESENTATION
Effective tax rate (as a percent)	4.00%	45.10%	76.10%	45.50%
Net capital loss carryback	$ 3,400		$ 3,400
Refund claim for prior year recognized	3,400		3,400
Increase (decrease) in unrecognized tax benefits	228		683
Income tax benefit net accrual adjustment discrete items	536		367
Income tax benefit from acquisitions	0		0
Net tax provision for discrete items	$ 1,600		$ 2,200