GOODWILL AND OTHER INTANGIBLE ASSETS - Changes in Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018		Dec. 31, 2017
Goodwill [Roll Forward]
Balance as of January 1,		$ 72,952	[1]	$ 73,164
Purchase price adjustments to goodwill		0		(354)
Translation adjustments		(94)		142
Balance as of December 31,	[1]	$ 72,858		$ 72,952

[1] On January 1, 2018, the Company adopted the ASC 606 revenue recognition standard and adjusted prior periods to conform. See "Note 2. Significant Accounting Policies" for additional information.