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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Accounts Receivable (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Allowance for Doubtful Accounts Receivable [Roll Forward]      
Beginning Balance $ 2,171 $ 1,088 $ 334
Provision 5,548 2,468 1,738
Write Offs (3,881) (1,385) (984)
Ending Balance $ 3,838 $ 2,171 $ 1,088
Accounts receivable, general payment terms 30 days    
Accounts receivable, domestic extended payment terms 90 days    
Accounts receivable, international extended payment terms greater than 90 days