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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 [Table Text Block]
The components of pretax income (loss) from continuing operations for the years ended December 31, 2018, 2017 and 2016 were as follows (in thousands):
 
Year Ended December 31,
 
2018
 
2017
 
2016
United States
$
23,349

 
$
30,095

 
$
(119,095
)
International
(22,318
)
 
6,050

 
(52,432
)
Income (loss) before provision (benefit) for income taxes
$
1,031

 
$
36,145

 
$
(171,527
)
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
The provision (benefit) for income taxes for the years ended December 31, 2018, 2017 and 2016 was allocated between continuing operations and discontinued operations as follows (in thousands):
 
Year Ended December 31,
 
2018
 
2017
 
2016
Continuing Operations
$
(957
)
 
$
7,544

 
$
(5,318
)
Discontinued Operations

 

 
2,771

Total
$
(957
)
 
$
7,544

 
$
(2,547
)

The provision (benefit) for income taxes from continuing operations for the years ended December 31, 2018, 2017 and 2016 consisted of the following components (in thousands):
 
Year Ended December 31,
 
2018
 
2017
 
2016
Current taxes:
 
 
 
 
 
U.S. federal
$
768

 
$
(120
)
 
$
(1,093
)
State
57

 
191

 
912

International
3,218

 
6,870

 
5,311

Total current taxes
4,043

 
6,941

 
5,130

Deferred taxes:
 
 
 
 
 
U.S. federal
(319
)
 
(1,335
)
 
(4,262
)
State

 
50

 
(11
)
International
(4,681
)
 
1,888

 
(6,175
)
Total deferred taxes
(5,000
)
 
603

 
(10,448
)
Provision (benefit) for income taxes
$
(957
)
 
$
7,544

 
$
(5,318
)
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
The items accounting for differences between the income tax provision (benefit) from continuing operations computed at the U.S. federal statutory rate and the provision (benefit) for income taxes for the years ended December 31, 2018, 2017 and 2016 were as follows (in thousands):
 
Year Ended December 31,
 
2018
 
2017
 
2016
U.S. federal income tax provision (benefit) at statutory rate
$
216

 
$
12,651

 
$
(60,035
)
Foreign income and losses taxed at different rates (1)
2,113

 
4,524

 
9,410

State income taxes, net of federal benefits, and state tax credits
1,966

 
(4,980
)
 
(4,694
)
Change in valuation allowances
3,829

 
(36,057
)
 
13,797

Effect of income tax rate changes on deferred items (2)
1,544

 
20,466

 
7,135

Tax effects of intercompany transactions
607

 
3,332

 
853

Adjustments related to uncertain tax positions
18

 
1,824

 
(4,899
)
Non-deductible stock-based compensation expense
3,239

 
5,002

 
6,724

Tax shortfalls on stock-based compensation awards
(335
)
 
4,290

 
12,585

Non-deductible (or non-taxable) change in fair value of investment

 

 
4,484

Federal research and development credits
(8,331
)
 
(7,862
)
 
(8,547
)
Forgiveness of intercompany liabilities
(1,340
)
 
(2,494
)
 
15,187

Deductions for investments in subsidiaries that have ceased operations

 

 
(645
)
Ordinary stock loss
(11,815
)
 

 

Non-taxable gains on business dispositions

 

 
(3,481
)
Non-deductible or non-taxable items
7,332

 
6,848

 
6,808

Provision (benefit) for income taxes
$
(957
)
 
$
7,544

 
$
(5,318
)
(1)
Tax rates in foreign jurisdictions were generally lower than the U.S. federal statutory rate through December 31, 2018. This results in an adverse impact to the provision (benefit) for income taxes in this rate reconciliation for the years ended December 31, 2018, 2017 and 2016, prior to the impact of valuation allowances, due to the net pretax losses from continuing operations in certain foreign jurisdictions with lower tax rates.
(2)
The effect of income tax rate changes on deferred items for the year ended December 31, 2017 is primarily related to the U.S. tax reform legislation that was signed into law on December 22, 2017, which included a reduction of the U.S. Federal income tax rate to 21 percent. That rate reduction did not impact the Company's provision for income taxes for the year ended December 31, 2017 due to the valuation allowance against the Company's U.S. net deferred tax assets.
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
The deferred income tax assets and liabilities consisted of the following components as of December 31, 2018 and 2017 (in thousands):
 
December 31,
 
2018
 
2017
Deferred tax assets:
 
 
 
Accrued expenses and other liabilities
$
25,694

 
$
36,786

Stock-based compensation
5,167

 
3,720

Net operating loss and tax credit carryforwards
206,328

 
208,040

Intangible assets, net
16,482

 
23,722

Investments
5,916

 
814

Unrealized foreign currency exchange losses
1,882

 
2,771

Other
1,021

 
687

Total deferred tax assets
262,490

 
276,540

Less: Valuation allowances
(228,023
)
 
(238,702
)
Deferred tax assets, net of valuation allowance
34,467

 
37,838

Deferred tax liabilities:
 
 
 
Prepaid expenses and other assets
(12,737
)
 
(10,011
)
Property, equipment and software, net
(12,576
)
 
(11,315
)
Convertible senior notes
(2,457
)
 
(2,773
)
Deferred revenue
(7,255
)
 
(10,436
)
Total deferred tax liabilities
(35,025
)
 
(34,535
)
Net deferred tax asset (liability)
$
(558
)
 
$
3,303

Summary of Income Tax Contingencies [Table Text Block]
The following table summarizes activity related to our gross unrecognized tax benefits, excluding interest and penalties, for the years ended December 31, 2018, 2017 and 2016 (in thousands):
 
Year Ended December 31,
 
2018
 
2017
 
2016
Beginning Balance
$
87,359

 
$
80,081

 
$
79,637

Increases related to prior year tax positions
1,500

 
960

 
1,708

Decreases related to prior year tax positions
(21
)
 
(1,196
)
 
(3,154
)
Increases related to current year tax positions
7,533

 
9,571

 
11,443

Decreases based on settlements with taxing authorities

 

 
(3,176
)
Decreases due to lapse of statute limitations
(9,447
)
 
(3,777
)
 
(4,906
)
Foreign currency translation
713

 
1,720

 
(1,471
)
Ending Balance
$
87,637

 
$
87,359

 
$
80,081