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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2017
Income Taxes [Abstract]  
Income From Continuing Operations Before Income Taxes
Income before income taxes is categorized geographically as follows:
 
Year Ended December 31,
 
2017
 
2016
 
2015
 
(In thousands)
United States
$
313,351

 
$
299,304

 
$
248,932

Foreign
285,661

 
281,869

 
238,718

Total income before income taxes
$
599,012

 
$
581,173

 
$
487,650

Components Of Provision For Income Taxes
The provision for income taxes consisted of the following:
 
Year Ended December 31,
 
2017
 
2016
 
2015
 
(In thousands)
Current expense:
 
 
 
 
 
Federal
$
16,870

 
$
34,842

 
$
13,601

State
294

 
240

 
156

Foreign, including withholding tax
15,539

 
19,268

 
17,241

 
32,703

 
54,350

 
30,998

Deferred expense (benefit):
 
 
 
 
 
Federal
90,113

 
64,301

 
65,168

State
19,654

 
21,492

 
15,767

Foreign
(706
)
 
385

 
481

 
109,061

 
86,178

 
81,416

Total income tax expense
$
141,764

 
$
140,528

 
$
112,414

Reconciliation Of Income Tax At Effective Income Tax Rate
The difference between income tax expense and the amount resulting from applying the federal statutory rate of 35% to Income before income taxes is attributable to the following:
 
Year Ended December 31,
 
2017
 
2016
 
2015
 
(In thousands)
Income tax expense at federal statutory rate
$
209,654

 
$
203,410

 
$
170,677

State taxes, net of federal benefit
13,029

 
14,517

 
9,616

Differences between statutory rate and foreign effective tax rate
(83,808
)
 
(79,087
)
 
(66,238
)
U.S. federal tax rate change
(186,800
)
 

 

U.S. tax on accumulated foreign earnings, net of foreign tax credits
162,353

 

 

Foreign withholding tax on unremitted foreign earnings, net of foreign tax credits
33,619

 

 

Other
(6,283
)
 
1,688

 
(1,641
)
Total income tax expense
$
141,764

 
$
140,528

 
$
112,414

Summary Of Deferred Tax Assets And Liabilities
The tax effects of temporary differences that give rise to significant portions of the Company’s deferred tax assets and liabilities are as follows:
 
As of December 31,
 
2017
 
2016
 
(In thousands)
Deferred tax assets:
 
 
 
Net operating loss carryforwards
$
70,587

 
$
46,879

Deductible goodwill and intangible assets
1,192

 
10,473

Tax credit carryforwards
52,659

 
59,337

Deferred revenue, accruals and reserves
77,869

 
114,548

Capital loss carryforwards
778,430

 
1,161,772

Other
5,584

 
4,791

Total deferred tax assets
986,321

 
1,397,800

Valuation allowance
(783,725
)
 
(1,162,101
)
Net deferred tax assets
202,596

 
235,699

Deferred tax liabilities:
 
 
 
Property and equipment
(1,577
)
 
(4,212
)
U.S. tax on accumulated foreign earnings
(162,912
)
 

Foreign withholding tax on unremitted earnings
(33,619
)
 

Subordinated Convertible debentures
(430,088
)
 
(590,921
)
Other
(3,116
)
 
(2,614
)
Total deferred tax liabilities
(631,312
)
 
(597,747
)
Total net deferred tax liabilities
$
(428,716
)
 
$
(362,048
)
Reconciliation Of Gross Unrecognized Tax Benefits
A reconciliation of the beginning and ending balances of the total amounts of gross unrecognized tax benefits is as follows:
 
As of December 31,
 
2017
 
2016
 
(In thousands)
Beginning balance
$
220,682

 
$
220,280

Increases in tax positions for prior years
3,699

 
119

Decreases in tax positions for prior years
(144
)
 
(71
)
Increases in tax positions for current year
395

 
354

Decreases in tax positions due to settlement with taxing authorities
(1,416
)
 

Ending balance
$
223,216

 
$
220,682