Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES [Abstract]
Accrued expenses	$ 122,443	$ 125,366
Accrued amounts due to mobile operators and other content providers	90,925	71,762
Money transfer settlement obligations	209,925	159,854
Derivative liabilities	66,042	25,891
Accrued expenses and other current liabilities	$ 489,335	$ 382,873