ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Changes in AOCI (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2017 USD ($)
Accumulated other comprehensive income (loss)
Balance at the beginning	$ 280,024
Balance at the end	295,662
Foreign Currency Translation
Accumulated other comprehensive income (loss)
Balance at the beginning	(12,649)
Other comprehensive income (loss) before reclassifications, net of tax	4,427
Other comprehensive income	4,427
Balance at the end	(8,222)
Unrealized Loss on Interest Rate Hedge
Accumulated other comprehensive income (loss)
Balance at the beginning	(2,076)
Other comprehensive income (loss) before reclassifications, net of tax	(593)
Amounts reclassified out of AOCI, net of tax (1)	1,181
Other comprehensive income	588
Balance at the end	(1,488)
Accumulated Other Comprehensive Income (Loss)
Accumulated other comprehensive income (loss)
Balance at the beginning	(14,725)
Other comprehensive income (loss) before reclassifications, net of tax	3,834
Amounts reclassified out of AOCI, net of tax (1)	1,181
Other comprehensive income	5,015
Balance at the end	$ (9,710)