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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Accounts Receivable (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Allowance for Doubtful Accounts Receivable [Roll Forward]        
Beginning balance $ 3,540 $ 2,549 $ 3,838 $ 2,171
Provision 850 608 1,523 2,197
Write-Offs (349) (795) (1,320) (2,006)
Ending balance $ 4,041 $ 2,362 $ 4,041 $ 2,362
Accounts receivable, general payment terms1     30 days  
Accounts receivable, international extended payment terms greater than1     90 days