RETIREMENT ANNUITY AND GUARANTEED CONTINUOUS EMPLOYMENT PLANS (Changes in Fair Value of Level 3 Pension Plan Assets) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
Retirement Annuity and Guaranteed Continuous Employment Plans
Fair value of plan assets at beginning of year	$ 813,897		$ 749,456
Realized and unrealized (losses) gains	101,044		83,156
Fair value of plan assets at end of year	939,995		813,897
Significant Unobservable Inputs (Level 3)
Retirement Annuity and Guaranteed Continuous Employment Plans
Fair value of plan assets at end of year	32,563		27,083
Private equity funds
Retirement Annuity and Guaranteed Continuous Employment Plans
Fair value of plan assets at end of year	32,563	[1]	27,083	[1]
Private equity funds | Significant Unobservable Inputs (Level 3)
Retirement Annuity and Guaranteed Continuous Employment Plans
Fair value of plan assets at beginning of year	27,083
Purchases, sales, issuances and settlements	2,186
Realized and unrealized (losses) gains	3,294
Fair value of plan assets at end of year	32,563
The amount of total (losses) gains during the period attributable to the change in unrealized (losses) gains relating to Level 3 net assets still held at the reporting date	$ 3,035

[1] Private equity funds consist of four funds seeking capital appreciation by investing in private equity investment partnerships and venture capital companies. Funds are comprised of unrestricted and restricted publicly traded securities and privately held securities. Unrestricted securities are valued at the closing market price on the reporting date. Restricted securities may be valued at a discount from such closing public market price, depending on facts and circumstances. Privately held securities are valued at fair value as determined by the fund directors and general partners.