Income Taxes (Tables)

12 Months Ended

Dec. 31, 2017

Income Tax Disclosure [Abstract]

Components of Income (Loss) Before Income Taxes

The components of total income (loss) before taxes from continuing operations are as follows (in thousands):

	Years ended December 31,
	2017			2016		2015
U.S.	$	8		$	90,154	$	151,862
Foreign	(58,351		)	561		13,772
Total income (loss) before taxes from continuing operations	$	(58,343	)	$	90,715	$	165,634

Components of Provision for Income Taxes

The provision for (benefit from) income taxes consisted of the following (in thousands): 

	Years ended December 31,
	2017			2016			2015
Current:
U.S. federal	$	(79	)	$	9,564		$	2,737
Foreign	16,871			22,552			26,275
State and local	77			8			319
Total current	16,869			32,124			29,331
Deferred:
U.S. federal	(8,390		)	2,365			23,478
Foreign	(10,463		)	392			(4,138		)
State and local	199			(255		)	(154		)
Total deferred	(18,654		)	2,502			19,186
Provision for (benefit from) income taxes	$	(1,785	)	$	34,626		$	48,517

Component of Company's Deferred Tax Assets and Liabilities

Significant components of the Company’s deferred tax assets and liabilities are as follows (in thousands): 

	December 31,
	2017			2016
Deferred tax assets
Net operating loss carryforwards	$	17,301		$	40,969
Research tax credit	15,433			9,642
Foreign tax credit	12,479			7,201
Expenses not currently deductible	13,031			5,193
Basis difference in fixed and intangible assets	3,200			3,529
Gross deferred tax assets	61,444			66,534
Valuation allowance	(32,032		)	(12,846		)
Net deferred tax assets	29,412			53,688
Deferred tax liabilities
Acquired intangible assets, domestic	(34,408		)	(70,338		)
Acquired intangible assets, foreign	(4,903		)	(13,045		)
Unremitted earnings of foreign subsidiaries	(30		)	(129		)
Net deferred tax liabilities	$	(9,929	)	$	(29,824	)

Schedule of Effective Income Tax Rate Reconciliation

A reconciliation of the statutory U.S. federal income tax rate to the Company’s effective tax rate is as follows: 

	Years Ended December 31,
	2017		2016		2015
U.S. federal statutory rate	35.0	%	35.0	%	35.0	%
State, net of federal benefit	(0.1	)	(0.5	)	—
Stock-based compensation expense	(2.9	)	2.0		0.5
Tax exempt interest	—		(0.2	)	(0.1	)
Research tax credit	3.2		(1.2	)	(0.3	)
Foreign withholding tax	(25.2	)	24.7		15.7
Transaction costs	—		2.4		—
Foreign tax rate differential	(20.8	)	0.4		(2.8	)
Foreign tax credit	22.9		(23.5	)	(15.3	)
Change in valuation allowance	(23.1	)	—		(3.0	)
Re-measurement of deferred taxes	13.5		—		—
Others	0.6		(0.9	)	(0.4	)
Total	3.1	%	38.2	%	29.3	%

Reconciliation of Unrecognized Tax Benefits

The reconciliation of the Company's unrecognized tax benefits for the years ended December 31, 2016, 2015 and 2014 is as follows (in thousands): 

	Years Ended December 31,
	2017		2016			2015
Total unrecognized tax benefits at January 1	$	30,088	$	3,071		$	2,734
Gross increases and decreases due to acquisition of DTS	—		27,584			—
Gross increases and decreases due to tax positions taken in prior periods	2,457		139			699
Gross increases and decreases due to tax positions taken in the current period	961		264			103
Gross increases and decreases due to settlements with taxing authorities	—		—			—
Gross increases and decreases due to lapses in applicable statutes of limitations	—		(970		)	(465		)
Total unrecognized tax benefits at December 31	$	33,506	$	30,088		$	3,071