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ACCRUED LIABILITIES (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Accrued liabilities consist of:    
Bonuses and accrued unused vacation $ 6,066 $ 6,928
Accrued equity-based awards 3,652 3,876
Accrued lease payments 2,801 1,740
Tax contingencies and accruals for unrecognized income tax benefits 2,349 2,588
Auditing and consulting services 1,066 2,531
Other accrued liabilities 4,515 5,782
Total accrued liabilities $ 20,449 $ 23,445