ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Schedule of Accumulated Other Comprehensive Income (Loss)) (Details)	12 Months Ended
	Dec. 31, 2016 USD ($)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	$ 751,443,000
Ending Balance	839,667,000
Reclassification adjustment out of accumulated comprehensive loss	0
Gains and Losses on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	0
Other comprehensive income (loss) before reclassifications	1,071,000
Current period other comprehensive income (loss)	1,071,000
Ending Balance	1,071,000
Defined Benefit Pension Items
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	9,000
Other comprehensive income (loss) before reclassifications	(45,000)
Current period other comprehensive income (loss)	(45,000)
Ending Balance	(36,000)
Foreign Currency Items
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(47,911,000)
Other comprehensive income (loss) before reclassifications	(10,278,000)
Current period other comprehensive income (loss)	(10,278,000)
Ending Balance	(58,189,000)
AOCI Attributable to Parent
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(47,902,000)
Other comprehensive income (loss) before reclassifications	(9,252,000)
Current period other comprehensive income (loss)	(9,252,000)
Ending Balance	$ (57,154,000)