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Income Taxes (Tables)
 12 Months Ended
Dec. 31, 2018
Income Tax Disclosure [Abstract]  
Components of Income (Loss) Before Income Taxes The components of income (loss) from continuing operations before income taxes were as follows (in thousands):
 
Year Ended December 31,
 
2018
 
2017
 
2016
Income (loss) from continuing operations before income taxes:
 
 
 
 
 
Domestic
$
318,635

 
$
291,031

 
$
349,959

Foreign
139,031

 
62,726

 
(42,273
)
Total
$
457,666

 
$
353,757

 
$
307,686
Provision for Income Taxes The components of the provision for income taxes for continuing operations were as follows (in thousands):
 
Year Ended December 31,
 
2018
 
2017
 
2016
Current:
 

 
 

 
 

Federal
$
50,306

 
$
44,695

 
$
106,316

State
26,170

 
301

 
11,549

Foreign
23,209

 
22,666

 
5,076

Total current tax provision
99,685

 
67,662

 
122,941

 
 
 
 
 
 
Deferred:
 
 
 
 
 
Federal
62,482

 
(36,915
)
 
(264
)
State
(4,152
)
 
14,951

 
(923
)
Foreign
3,644

 
(10,166
)
 
(14,508
)
Total deferred tax provision (benefit)
61,974

 
(32,130
)
 
(15,695
)
Total provision for income taxes from continuing operations
$
161,659

 
$
35,532

 
$
107,246
Effective Income Tax Rate Reconciliation The actual income tax provision differed from the income tax provision computed by applying the U.S. federal statutory corporate rate to income from continuing operations before provision for income taxes as follows (in thousands):
 
Year Ended December 31,
 
2018
 
2017
 
2016
Provision at the statutory rate
$
96,110

 
$
123,815

 
$
107,690

Increases (decreases) resulting from —
 
 
 
 
 
Tax Cuts and Jobs Act
(6,295
)
 
(70,129
)
 
—

State taxes
18,504

 
17,920

 
6,479

Foreign taxes
2,734

 
(16,958
)
 
1,860

Contingency reserves, net
(2,619
)
 
3,651

 
(13,540
)
Production activity deduction
—

 
(1,504
)
 
(8,586
)
Employee per diems, meals and entertainment
11,949

 
13,605

 
8,764

Taxes on unincorporated joint ventures
(578
)
 
(1,354
)
 
(656
)
Asset impairments
—

 
—

 
1,909

Entity restructuring and recapitalization efforts
(4,424
)
 
(26,668
)
 
—

Equity compensation
(1,449
)
 
(5,095
)
 
—

Valuation allowance - Foreign Tax Credits
43,507

 
—

 
—

Other
4,220

 
(1,751
)
 
3,326

Total provision for income taxes from continuing operations
$
161,659

 
$
35,532

 
$
107,246
Deferred Tax Assets and Liabilities and Net Deferred Income Tax Assets and Liabilities The tax effects of these temporary differences, representing deferred tax assets and liabilities, result principally from the following (in thousands):
 
December 31,
 
2018
 
2017
Deferred income tax liabilities:
 
 
 
Property and equipment
$
(178,090
)
 
$
(161,491
)
Goodwill
(60,305
)
 
(49,407
)
Other intangibles
(21,034
)
 
(26,676
)
Customer holdbacks
(44,173
)
 
(36,218
)
Other book/tax accounting method differences
(7,247
)
 
(17,967
)
Total deferred income tax liabilities
(310,849
)
 
(291,759
)
 
 
 
 
Deferred income tax assets:
 

 
 

Accruals and reserves
28,594

 
21,419

Stock and incentive compensation
20,627

 
17,676

Net operating loss carryforwards
52,406

 
62,925

Tax credits
43,572

 
48,516

Deferred profit on investment in unconsolidated affiliates
16,021

 
2,813

Other
15,054

 
4,747

Subtotal
176,274

 
158,096

Valuation allowance
(67,601
)
 
(19,328
)
Total deferred income tax assets
108,673

 
138,768

Total net deferred income tax liabilities
$
(202,176
)
 
$
(152,991
)

The net deferred income tax assets and liabilities were comprised of the following in the accompanying consolidated balance sheets (in thousands):
 
December 31,
 
2018
 
2017
Deferred income taxes:
 

 
 

Assets
$
16,939

 
$
26,390

Liabilities
(219,115
)
 
(179,381
)
Total net deferred income tax liabilities
$
(202,176
)
 
$
(152,991
)
Reconciliation of Unrecognized Tax Benefit A reconciliation of unrecognized tax benefit balances is as follows (in thousands):
 
December 31,
 
2018
 
2017
 
2016
Balance at beginning of year
$
36,229

 
$
35,240

 
$
54,541

Additions based on tax positions related to the current year
6,231

 
7,040

 
4,227

Additions for tax positions of prior years
9,377

 
3,372

 
2,048

Reductions for tax positions of prior years
(2,870
)
 
(1,171
)
 
(1,948
)
Reductions for audit settlements
—

 
—

 
(180
)
Reductions resulting from a lapse of the applicable statute
of limitations periods
(7,857
)
 
(8,252
)
 
(23,448
)
Balance at end of year
$
41,110

 
$
36,229

 
$
35,240
Balances of Unrecognized Tax Benefits The balances of unrecognized tax benefits, the amount of related interest and penalties and what Quanta believes to be the range of reasonably possible changes in the next 12 months are as follows (in thousands):
 
December 31,
 
2018

2017

2016
Unrecognized tax benefits
$
41,110


$
36,229


$
35,240

Portion that, if recognized, would reduce tax expense and
effective tax rate
40,977


35,561


33,128

Accrued interest on unrecognized tax benefits
5,459


5,368


5,539

Accrued penalties on unrecognized tax benefits
631


631


650

Reasonably possible reduction to the balance of unrecognized
tax benefits in succeeding 12 months
$0 to $9,541


$0 to $13,655


$0 to $12,332

Portion that, if recognized, would reduce tax expense and
effective tax rate
$0 to $8,224


$0 to $12,483


$0 to $10,983