Pension and Other Post-Retirement Benefits Components of Long-Term Compensation Arrangements (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
LONG-TERM COMPENSATION BENEFITS [Abstract]
Long-Term Compensation Defined Benefit Pension Plan	$ 22,139	$ 12,319
Long-Term Compensation Post Retirement Other Than Pension	6,243	6,431
Long-Term Compensation Supplemental Retirement Plan	6,224	4,843
Long-Term Compensation Deferred Compensation	1,639	1,411
Long-Term Compensation Other Long-Term Compensation	185	228
Long-Term Compensation Arrangements	$ 36,430	$ 25,232