ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Changes in AOCI (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2017 USD ($)
Accumulated other comprehensive income (loss)
Balance at the beginning	$ 280,024
Balance at the end	287,149
Foreign Currency Translation
Accumulated other comprehensive income (loss)
Balance at the beginning	(12,649)
Other comprehensive income (loss) before reclassifications, net of tax	1,991
Other comprehensive income	1,991
Balance at the end	(10,658)
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	(534)
Amounts reclassified out of AOCI, net of tax (1)	873
Other comprehensive income	339
Balance at the end	(1,737)
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	1,457
Amounts reclassified out of AOCI, net of tax (1)	873
Other comprehensive income	2,330
Balance at the end	$ (12,395)