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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2018
Income Tax Disclosure [Abstract]  
Schedule of Income before Income Tax, Domestic and Foreign
income before provision for income taxes and equity in losses of investee consists of the following (in thousands):
 
Year ended December 31,
 
2018
 
2017
 
2016
Domestic
$
171,658

 
$
123,696

 
$
118,871

Foreign
294,993

 
241,103

 
123,695

Net income before provision for income taxes and equity in losses of investee
$
466,651

 
$
364,799

 
$
242,566

Schedule of Components of Income Tax Expense (Benefit)
The provision for (benefit from) income taxes consists of the following (in thousands):
 
Year Ended December 31,
 
2018
 
2017
 
2016
Federal
 
 
 
 
 
Current
$
35,788

 
$
91,214

 
$
40,235

Deferred
(5,989
)
 
15,724

 
24,794

 
29,799

 
106,938

 
65,029

State
 
 
 
 
 
Current
9,568

 
2,580

 
2,603

Deferred
(3,274
)
 
2,677

 
2,636

 
6,294

 
5,257

 
5,239

Foreign
 
 
 
 
 
Current
22,753

 
15,285

 
8,964

Deferred
(1,123
)
 
2,682

 
(28,032
)
 
21,630

 
17,967

 
(19,068
)
Provision for income taxes
$
57,723

 
$
130,162

 
$
51,200

Schedule of Effective Income Tax Rate Reconciliation
The differences between income taxes using the federal statutory income tax rate of 21% for 2018 and 35% for 2017 and 2016 and our effective tax rate are as follows: 
 
Year Ended December 31,
 
2018
 
2017
 
2016
U.S. federal statutory income tax rate
21.0
 %
 
35.0
 %
 
35.0
 %
State income taxes, net of federal tax benefit
1.3

 
1.4

 
2.1

U.S. tax on foreign earnings
4.1

 
1.5

 
0.2

Impact of U.S. Tax Cuts and Jobs Act (“TCJA”)
2.1

 
23.1

 

Impact of differences in foreign tax rates
(6.7
)
 
(18.0
)
 
(6.3
)
Impact of expiration of statute of limitations
(6.2
)
 

 

Stock-based compensation
(3.4
)
 
(6.3
)
 
1.2

Other items not individually material
0.2

 
(1.0
)
 
1.8

Valuation allowance release for Israel

 

 
(12.9
)
 
12.4
 %
 
35.7
 %
 
21.1
 %
Schedule of Deferred Tax Assets and Liabilities
As of December 31, 2018 and 2017, the significant components of our deferred tax assets and liabilities are (in thousands):
 
 
Year Ended December 31,
 
 
2018
 
2017
Deferred tax assets:
 
 
 
 
Net operating loss and capital loss carryforwards
 
$
25,410

 
$
24,971

Reserves and accruals
 
24,769

 
12,547

Stock-based compensation
 
8,571

 
10,074

Deferred revenue
 
14,285

 
10,811

Net translation losses
 
1,158

 
1,928

Credit carryforwards
 
115

 
792

 
 
74,308

 
61,123

Deferred tax liabilities:
 
 
 
 
Depreciation and amortization
 
8,320

 
7,522

Prepaid expenses
 
902

 
751

Unremitted foreign earnings
 
612

 
3,305

 
 
9,834

 
11,578

Net deferred tax assets before valuation allowance
 
64,474

 
49,545

Valuation allowance
 
(251
)
 
(278
)
Net deferred tax assets
 
$
64,223

 
$
49,267

Schedule of Unrecognized Tax Benefits Rollforward
The changes in the balance of gross unrecognized tax benefits, which exclude interest and penalties, for the year ended December 31, 2018, 2017 and 2016, are as follows (in thousands):

Unrecognized tax benefit as of December 31, 2015
$
39,413

Tax positions related to current year:
 
Additions for uncertain tax positions
6,971

Unrecognized tax benefit as of December 31, 2016
46,384

Tax positions related to current year:
 
Additions for uncertain tax positions
1,819

Tax positions related to prior year:
 
Additions for uncertain tax positions
1,809

Decreases for uncertain tax positions
(826
)
Settlements with tax authorities
(1,527
)
Reductions due to lapse of applicable statute of limitations
(3
)
Unrecognized tax benefit as of December 31, 2017
47,656

Tax positions related to current year:
 
Additions for uncertain tax positions
14,519

Tax positions related to prior year:
 
Additions for uncertain tax positions
80

Reductions due to lapse of applicable statute of limitations
(28,993
)
Unrecognized tax benefit as of December 31, 2018
$
33,262