DEFERRED REVENUE (Tables)

6 Months Ended

Jun. 30, 2016

DEFERRED REVENUE [Abstract]

Reconciliation of Deferred Revenue Balances

	Three Months Ended		Six Months Ended
	June 30		June 30
in thousands	2016	2015	2016	2015
Deferred Revenue
Balance at beginning of period	$     212,292	$     218,987	$     214,060	$     219,968
Amortization of deferred revenue	(2,092)	(1,558)	(3,860)	(2,539)
Balance at end of period	$     210,200	$     217,429	$     210,200	$     217,429