DEFERRED REVENUE (Tables)

3 Months Ended

Mar. 31, 2017

DEFERRED REVENUE [Abstract]

Reconciliation of Deferred Revenue Balances

	Three Months Ended
	March 31
in thousands	2017	2016
Deferred Revenue
Balance at beginning of year	$     206,468	$     214,060
Amortization of deferred revenue	(1,649)	(1,768)
Balance at end of period	$     204,819	$     212,292