SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 3) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 statement	Dec. 31, 2010	Dec. 31, 2009
Changes in accumulated other comprehensive income (loss), net of tax
Beginning Balance	$ (3,161)	$ (10,227)	$ (29,447)
Before-Tax Amount	(17,007)	12,593	19,545
Tax Benefit (Expense)	5,665	(5,527)	(325)
Net-of-Tax Amount	(11,342)	7,066	19,220
Ending Balance	(14,503)	(3,161)	(10,227)
Earnings per Share
Weighted average shares of common stock outstanding - basic	46,249,571	45,600,043	45,403,401
Potentially dilutive shares resulting from stock plans	586,000	371,000	10,000
Weighted average shares of common stock outstanding - diluted	46,835,712	45,970,680	45,413,770
Antidilutive options not included in the weighted average common shares-diluted calculation (in shares)	164,000	1,701,000	3,408,000
Number of separate but consecutive statements	2
Pension Adjustment
Changes in accumulated other comprehensive income (loss), net of tax
Beginning Balance	(22,161)	(24,420)	(24,901)
Before-Tax Amount	(18,678)	4,315	786
Tax Benefit (Expense)	7,239	(2,056)	(305)
Net-of-Tax Amount	(11,439)	2,259	481
Ending Balance	(33,600)	(22,161)	(24,420)
Foreign currency translation adjustment
Changes in accumulated other comprehensive income (loss), net of tax
Beginning Balance	21,622	21,937	3,228
Before-Tax Amount	(2,525)	(315)	18,709
Net-of-Tax Amount	(2,525)	(315)	18,709
Ending Balance	19,097	21,622	21,937
Unrealized loss on derivatives
Changes in accumulated other comprehensive income (loss), net of tax
Beginning Balance	(2,622)	(7,744)	(7,774)
Before-Tax Amount	4,196	8,593	50
Tax Benefit (Expense)	(1,574)	(3,471)	(20)
Net-of-Tax Amount	2,622	5,122	30
Ending Balance		$ (2,622)	$ (7,744)