Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES [Abstract]
Accrued expenses	$ 120,863	$ 97,115
Accrued amounts due to mobile operators and other content providers	72,475	64,839
Money transfer settlement obligations	167,056	137,285
Derivative liabilities	41,351	36,439
Deferred income taxes	1,215	683
Accrued expenses and other current liabilities	$ 402,960	$ 336,361