Quarterly report pursuant to Section 13 or 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - CASH AND CASH EQUIVALENTS (Details)

v3.5.0.2
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - CASH AND CASH EQUIVALENTS (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Dec. 31, 2014
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents $ 109,649 $ 104,914 $ 74,422 $ 44,816
Cash        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 54,976 47,431    
Cash Equivalents        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents $ 54,673 $ 57,483