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OTHER COMPREHENSIVE INCOME (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2009
Sep. 30, 2009
Stockholders' Equity                            
Adjustment to pension liability   $ (35,471)       $ (29,886)       $ (26,601)       $ (23,888)
Foreign currency translation   18,104       7,416       8,666       9,534
Net unrealized (losses) gains from cash flow hedges   (3,781)       (4,023)       1,595       112
Accumulated Other Comprehensive Income (34,464) (21,148) (22,667) (16,172) (27,306) (26,493) (19,525) (19,836) (17,364) (16,340) (22,154) (20,022) (13,195) (14,242)
Adjustment to the pension liability, tax benefit   $ 17,886       $ 15,226       $ 12,925       $ 11,716