FAIR VALUE MEASUREMENTS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 Other noncurrent assets [Member]	Dec. 31, 2011 Other noncurrent assets [Member]	Sep. 30, 2012 Other noncurrent assets [Member] Level 1 [Member]	Dec. 31, 2011 Other noncurrent assets [Member] Level 1 [Member]	Sep. 30, 2012 Other noncurrent assets [Member] Level 2 [Member]	Dec. 31, 2011 Other noncurrent assets [Member] Level 2 [Member]	Sep. 30, 2012 Other noncurrent assets [Member] Level 3 [Member]	Dec. 31, 2011 Other noncurrent assets [Member] Level 3 [Member]	Sep. 30, 2012 Other long-term liabilities [Member]	Sep. 30, 2012 Other long-term liabilities [Member] Level 1 [Member]	Sep. 30, 2012 Other long-term liabilities [Member] Level 2 [Member]	Sep. 30, 2012 Other long-term liabilities [Member] Level 3 [Member]	Sep. 30, 2012 Goodwill [Member]	Sep. 30, 2012 Goodwill [Member] Level 1 [Member]	Sep. 30, 2012 Goodwill [Member] Level 2 [Member]	Sep. 30, 2012 Goodwill [Member] Level 3 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Investments held in Rabbi Trusts						$ 1,458	$ 1,395	$ 1,458	$ 1,395	$ 0	$ 0	$ 0	$ 0
Interest rate swap							6		0		6		0	80	0	80	0
Goodwill																		163,205	0	0	163,205
Impairment of goodwill	$ 36,600	$ 12,000	$ 0	$ 48,600	$ 0