DEFERRED REVENUE (Reconciliation of Deferred Revenue Balances) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
DEFERRED REVENUE [Abstract]
Balance at beginning of year	$ 214,060	$ 219,968
Amortization of deferred revenue	(1,768)	(981)
Balance at end of period	$ 212,292	$ 218,987