ACCUMULATED OTHER COMPREHENSIVE LOSS - Summary of Changes in Accumulated Other Comprehensive Loss Included Within Shareholders' Equity (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Accumulated Other Comprehensive Loss [Line Items]
Balance, beginning of period	$ 457,468
Other comprehensive income (loss) before tax	(547)	$ 1,959
Tax (provision) benefit attributable to other comprehensive income (loss)	230	(448)
Balance, end of period	449,936
Foreign currency translation adjustments
Accumulated Other Comprehensive Loss [Line Items]
Balance, beginning of period	(21,366)	(31,973)
Other comprehensive income (loss) before tax	(126)	2,108
Tax (provision) benefit attributable to other comprehensive income (loss)	124	(508)
Balance, end of period	(21,492)	(29,865)
Foreign currency hedge
Accumulated Other Comprehensive Loss [Line Items]
Balance, beginning of period	3,246	5,048
Other comprehensive income (loss) before tax	(421)	(166)
Tax (provision) benefit attributable to other comprehensive income (loss)	106	63
Balance, end of period	2,825	4,882
Defined benefit pension plans
Accumulated Other Comprehensive Loss [Line Items]
Balance, beginning of period	(7,221)	(10,518)
Other comprehensive income (loss) before tax	0	17
Tax (provision) benefit attributable to other comprehensive income (loss)	0	(3)
Balance, end of period	(7,221)	(10,501)
Tax provision
Accumulated Other Comprehensive Loss [Line Items]
Balance, beginning of period	5,545	8,443
Tax (provision) benefit attributable to other comprehensive income (loss)	230	(448)
Balance, end of period	5,775	7,995
Accumulated other comprehensive loss
Accumulated Other Comprehensive Loss [Line Items]
Balance, beginning of period	(19,796)	(29,000)
Other comprehensive income (loss)	(317)	1,511
Balance, end of period	$ (20,113)	$ (27,489)