Income Taxes (Tables)

12 Months Ended

Dec. 31, 2015

Income Taxes [Abstract]

Components of Income Tax Expense

	For the years ended December 31,
	2013		2014			2015
Current income tax expense	$	22,382	$	69,693		$	131,190
Deferred income tax expense (benefit)		1,041		(18,268	)		(11,705	)
Total income tax expense	$	23,423	$	51,425		$	119,485

Components of Deferred Tax Assets and Liabilities

	December 31,
	2014			2015
Current deferred tax assets
Accrued payroll	$	5,141		$	-
Provision of allowance for doubtful accounts		478			896
Deferred revenue-current		660			447
Less: Valuation allowance		(1,435	)		(75	)
Current deferred tax assets, net		4,844			1,268
Noncurrent deferred tax assets
Deferred revenue-noncurrent		339			743
Intangible assets		953			1,065
Fixed assets		100			108
Subsidy income		270			2,729
Promotion fee		13,894			30,636
Unrealized loss on available-for-sale investments		2,462			-
Net operating loss carry forwards		9,193			40,154
Less: Valuation allowance		(10,846	)		(38,530	)
Noncurrent deferred tax assets, net		16,365			36,905
Noncurrent deferred tax liabilities
Acquired intangible assets		8,159			15,582
Unrealized gain on available-for-sale investments		357			-
Noncurrent deferred tax liabilities	$	8,516		$	15,582

Effective Income Tax Rate Reconciliation

	For the years ended December 31,
	2013			2014			2015
Income before income tax expense	$	124,019		$	286,494		$	434,185
PRC statutory income tax rate		25	%		25	%		25	%
Income tax expense at the statutory income tax rate		31,005			71,624			108,546
Permanent differences		1,663			5,506			11,713
Effect of different income tax calculation method required by tax bureau		48			(5	)		(11	)
Effect of tax exempt status in Cayman Islands and other jurisdictions		30,241			24,701			26,335
Effect of different income tax rate in Hong Kong		168			273			451
Effect of income tax holiday and preferential tax rates		(43,460	)		(58,529	)		(56,049	)
Changes in valuation allowance		3,758			7,855			28,500
Income tax expense	$	23,423		$	51,425		$	119,485