ACCOUNTS RECEIVABLE, NET (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Accounts receivable, net
Accounts receivable, gross	$ 111,354	$ 123,479
Less: allowance for doubtful accounts	(9,774)	(18,456)
Total	101,580	105,023
Billed
Accounts receivable, net
Accounts receivable, gross	63,066	67,021
Unbilled Revenues
Accounts receivable, net
Accounts receivable, gross	$ 48,288	$ 56,458