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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2017
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,
| 2017 |  | 2016 |  | 2015
Income (loss) from continuing operations before income taxes: |  |  |  |  |
Domestic | $ | 291,031 |  |  | $ | 349,959 |  |  | $ | 244,955 |
Foreign | 62,726 |  |  | (42,273 | ) |  | (16,280 | )
Total | $ | 353,757 |  |  | $ | 307,686 |  |  | $ | 228,675 |
Provision for Income Taxes | The components of the provision for income taxes for continuing operations were as follows (in thousands):
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Current: |  |  |  |  |  |  |  |
Federal | $ | 44,695 |  |  | $ | 106,316 |  |  | $ | 85,830 |
State | 301 |  |  | 11,549 |  |  | 9,783 |
Foreign | 22,666 |  |  | 5,076 |  |  | 21,262 |
Total current tax provision | 67,662 |  |  | 122,941 |  |  | 116,875 |
Deferred: |  |  |  |  |
Federal | (36,915 | ) |  | (264 | ) |  | (5,247 | )
State | 14,951 |  |  | (923 | ) |  | 917 |
Foreign | (10,166 | ) |  | (14,508 | ) |  | (15,073 | )
Total deferred tax benefit | (32,130 | ) |  | (15,695 | ) |  | (19,403 | )
Total provision for income taxes from continuing operations | $ | 35,532 |  |  | $ | 107,246 |  |  | $ | 97,472 |
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,
| 2017 |  | 2016 |  | 2015
Provision at the statutory rate | $ | 123,815 |  |  | $ | 107,690 |  |  | $ | 80,036 |
Increases (decreases) resulting from — |  |  |  |  |
Tax Cuts and Jobs Act | (70,129 | ) |  | — |  |  | — |
State taxes | 17,920 |  |  | 6,479 |  |  | 7,241 |
Foreign taxes | (16,958 | ) |  | 1,860 |  |  | 1,239 |
Contingency reserves, net | 3,651 |  |  | (13,540 | ) |  | 4,438 |
Production activity deduction | (1,504 | ) |  | (8,586 | ) |  | (6,871 | )
Employee per diems, meals and entertainment | 13,605 |  |  | 8,764 |  |  | 8,727 |
Taxes on unincorporated joint ventures | (1,354 | ) |  | (656 | ) |  | (3,838 | )
Asset impairments | — |  |  | 1,909 |  |  | 7,047 |
Entity restructuring and recapitalization efforts | (26,668 | ) |  | — |  |  | — |
Equity compensation | (5,095 | ) |  | — |  |  | — |
Other | (1,751 | ) |  | 3,326 |  |  | (547 | )
Total provision for income taxes from continuing operations | $ | 35,532 |  |  | $ | 107,246 |  |  | $ | 97,472 |
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,
| 2017 |  | 2016
Deferred income tax liabilities: |  |  |
Property and equipment | $ | (161,491 | ) |  | $ | (214,902 | )
Goodwill | (49,407 | ) |  | (83,097 | )
Other intangibles | (26,676 | ) |  | (33,566 | )
Customer holdbacks | (36,218 | ) |  | (16,424 | )
Other book/tax accounting method differences | (15,154 | ) |  | (24,817 | )
Total deferred income tax liabilities | (288,946 | ) |  | (372,806 | )
Deferred income tax assets: |  |  |  |  |
Accruals and reserves | 21,419 |  |  | 21,681 |
Accrued insurance | — |  |  | 79,630 |
Stock and incentive compensation and pension withdrawal liabilities | 17,676 |  |  | 58,744 |
Net operating loss carryforwards | 62,925 |  |  | 37,362 |
Tax credits | 48,516 |  |  | 1,613 |
Other | 4,747 |  |  | 5,933 |
Subtotal | 155,283 |  |  | 204,963 |
Valuation allowance | (19,328 | ) |  | (14,991 | )
Total deferred income tax assets | 135,955 |  |  | 189,972 |
Total net deferred income tax liabilities | $ | (152,991 | ) |  | $ | (182,834 | )
The net deferred income tax assets and liabilities were comprised of the following in the accompanying consolidated balance sheets (in thousands):
| December 31,
| 2017 |  | 2016
Deferred income taxes: |  |  |  |  |
Assets | $ | 26,390 |  |  | $ | 10,000 |
Liabilities | (179,381 | ) |  | (192,834 | )
Total net deferred income tax liabilities | $ | (152,991 | ) |  | $ | (182,834 | )
Reconciliation of Unrecognized Tax Benefit | A reconciliation of unrecognized tax benefit balances is as follows (in thousands):
| December 31,
| 2017 |  | 2016 |  | 2015
Balance at beginning of year | $ | 35,240 |  |  | $ | 54,541 |  |  | $ | 50,668 |
Additions based on tax positions related to the current year | 7,040 |  |  | 4,227 |  |  | 5,340 |
Additions for tax positions of prior years | 3,372 |  |  | 2,048 |  |  | 292 |
Reductions for tax positions of prior years | (1,171 | ) |  | (1,948 | ) |  | (132 | )
Reductions for audit settlements | — |  |  | (180 | ) |  | (1,345 | )
Reductions resulting from a lapse of the applicable statute of limitations periods | (8,252 | ) |  | (23,448 | ) |  | (282 | )
Balance at end of year | $ | 36,229 |  |  | $ | 35,240 |  |  | $ | 54,541 |
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,
| 2017 |  | 2016 |  | 2015
Unrecognized tax benefits | $ | 36,229 |  |  | $ | 35,240 |  |  | $ | 54,541 |
Portion that, if recognized, would reduce tax expense and effective tax rate | 35,561 |  |  | 33,128 |  |  | 48,312 |
Accrued interest on unrecognized tax benefits | 5,368 |  |  | 5,539 |  |  | 8,750 |
Accrued penalties on unrecognized tax benefits | 631 |  |  | 650 |  |  | 673 |
Reasonably possible reduction to the balance of unrecognized tax benefits in succeeding 12 months | $0 to $13,655 |  |  | $0 to $12,332 |  |  | $0 to $27,485 |
Portion that, if recognized, would reduce tax expense and effective tax rate | $0 to $12,483 |  |  | $0 to $10,983 |  |  | $0 to $24,009 |

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- Definition Tabular disclosure for tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities and other income tax contingencies. Includes, but is not limited to, interest and penalties, reconciliation of unrecognized tax benefits, unrecognized tax benefits that would affect the effective tax rate, tax years that remain subject to examination by tax jurisdictions, and information about positions for which it is reasonably possible that amounts unrecognized will significantly change within 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32840-109319 + Details
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