DEFERRED REVENUE (Tables)

9 Months Ended

Sep. 30, 2016

DEFERRED REVENUE [Abstract]

Reconciliation of Deferred Revenue Balances

	Three Months Ended		Nine Months Ended
	September 30		September 30
in thousands	2016	2015	2016	2015
Deferred Revenue
Balance at beginning of period	$     210,200	$     217,429	$     214,060	$     219,968
Amortization of deferred revenue	(2,068)	(1,778)	(5,928)	(4,317)
Balance at end of period	$     208,132	$     215,651	$     208,132	$     215,651