ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (ROLLFORWARD TABLE) (DETAILS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance, value	$ (361,895)	$ (440,817)	$ (463,250)
Ending balance, value	(362,845)	(361,895)	(440,817)
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance, value	126,964	101,365	52,274
Other comprehensive income (loss) before reclassifications	39,536	(7,668)	(57,807)
Amounts reclassified from accumulated other comprehensive income (loss)	(14,876)	(17,931)	8,716
Net current period other comprehensive income (loss)	24,660	(25,599)	(49,091)
Ending balance, value	102,304	126,964	101,365
Foreign Currency Translation Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance, value	92,008	71,196	33,352
Other comprehensive income (loss) before reclassifications	7,908	(20,812)	(37,844)
Net current period other comprehensive income (loss)	7,908	(20,812)	(37,844)
Ending balance, value	84,100	92,008	71,196
Derivative Valuation, Net of Tax
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance, value	32,393	26,885	18,345
Other comprehensive income (loss) before reclassifications	31,053	11,242	(16,349)
Amounts reclassified from accumulated other comprehensive income (loss)	(14,406)	(16,750)	7,809
Net current period other comprehensive income (loss)	16,647	(5,508)	(8,540)
Ending balance, value	15,746	32,393	26,885
Other, Net of Tax.
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance, value	2,563	3,284	577
Other comprehensive income (loss) before reclassifications	575	1,902	(3,614)
Amounts reclassified from accumulated other comprehensive income (loss)	(470)	(1,181)	907
Net current period other comprehensive income (loss)	105	721	(2,707)
Ending balance, value	$ 2,458	$ 2,563	$ 3,284