GOODWILL AND OTHER INTANGIBLE ASSETS (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended					12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Trade Name ACP	Dec. 31, 2011 Trade Name ACP	Dec. 31, 2010 Trade Name ACP	Dec. 31, 2012 Customer Lists Y	Dec. 31, 2011 Customer Lists	Dec. 31, 2012 Patents and Other Intangibles Y	Dec. 31, 2011 Patents and Other Intangibles
Finite-lived intangible assets, gross asset value
Balance at the beginning of the period						$ 34,883	$ 32,447	$ 26,101	$ 25,262
Write-offs and other adjustments	(147)								(147)
Additions	14,870	3,128				13,161	2,436	1,709	692
Balance at the end of the period						48,044	34,883	27,810	26,101
Indefinite-lived intangible assets			9,070	9,070	9,070
Gross asset value
Balance at the beginning of the period	70,054	66,779
Additions	14,870	3,128				13,161	2,436	1,709	692
Balance at the end of the period	84,924	70,054
Accumulated Amortization
Balance at the beginning of the period	(15,160)	(10,400)				(4,648)	(1,942)	(10,512)	(8,458)
Amortization expense	(5,483)	(4,760)				(3,198)	(2,706)	(2,285)	(2,054)
Balance at the end of the period	(20,643)	(15,160)				(7,846)	(4,648)	(12,797)	(10,512)
Net book value						40,198		15,013
Net book value	64,281	54,894
Weighted average life of the additions to customer lists, patents and other intangibles						9.7		9.7
Estimated aggregate amortization expense for definite-lived intangible assets
2013	6,778
2014	6,731
2015	6,676
2016	5,195
2017	4,720
Thereafter	25,111
Estimated aggregate amortization expense	$ 55,211