COMMITMENTS, CONTINGENCIES, CONCENTRATIONS OF RISK AND LITIGATION - Summary of future minimum payments under service commitments (Details 4) (IP, Telecommunications and Data Center Services, USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
IP, Telecommunications and Data Center Services
Contractual Commitments Future Minimum Payments [Line Items]
2013	$ 6,304
2014	4,107
2015	2,928
2016	1,552
2017	390
Thereafter	429
Total contractual commitments future minimum payments due	$ 15,710