STOCKHOLDERS' EQUITY (Schedule of Changes in Unrealized Actuarial Losses) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013
STOCKHOLDERS' EQUITY [Abstract]
Balance, beginning of period	$ (68,511)	[1]
Other comprehensive income before reclassifications	35,300	[1]
Amounts reclassified from accumulated other comprehensive loss to net income	501	[1]
Net current period other comprehensive income	35,801	[1]
Balance, end of period	$ (32,710)	[1]

[1] All amounts are net of tax. Amounts in parentheses indicate debits.