EXIT ACTIVITIES AND RESTRUCTURING LIABILITIES - Summary of activity and balances for restructuring and asset impairment activity (Details) (Data center services, Exit activities and Restructuring charges, USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Restructuring Reserve [Roll Forward]
December 31, 2012 and 2013	$ 4,163	$ 5,873
Initial Charges	1,454	81
Subsequent Plan Adjustments	1,542	841
Cash Payments	(2,296)	(2,180)
September 30, 2013 and 2014	4,863	4,615
2014 exit activities
Restructuring Reserve [Roll Forward]
December 31, 2012 and 2013
Initial Charges	1,454
Subsequent Plan Adjustments
Cash Payments	(205)
September 30, 2013 and 2014	1,249
2011 - 2013 exit activities
Restructuring Reserve [Roll Forward]
December 31, 2012 and 2013	67	146
Initial Charges		81
Subsequent Plan Adjustments	21	(3)
Cash Payments	(78)	(128)
September 30, 2013 and 2014	10	96
2007 restructuring
Restructuring Reserve [Roll Forward]
December 31, 2012 and 2013	3,296	4,245
Initial Charges
Subsequent Plan Adjustments	1,521	754
Cash Payments	(1,538)	(1,493)
September 30, 2013 and 2014	3,279	3,506
2001 restructuring
Restructuring Reserve [Roll Forward]
December 31, 2012 and 2013	800	1,482
Initial Charges
Subsequent Plan Adjustments		90
Cash Payments	(475)	(559)
September 30, 2013 and 2014	$ 325	$ 1,013