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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2016

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,
		2016				2015				2014
Income (loss) from continuing operations before income taxes:
Domestic		$	349,959			$	244,955			$	263,357
Foreign			(42,273	)			(16,280	)			163,242
Total		$	307,686			$	228,675			$	426,599

Provision for Income Taxes

The components of the provision for income taxes for continuing operations were as follows (in thousands):

		Year Ended December 31,
		2016				2015				2014
Current:
Federal		$	106,316			$	85,830			$	67,430
State			11,549				9,783				8,693
Foreign			5,076				21,262				39,978
Total current tax provision			122,941				116,875				116,101
Deferred:
Federal			(264	)			(5,247	)			11,507
State			(923	)			917				2,232
Foreign			(14,508	)			(15,073	)			9,167
Total deferred tax provision (benefit)			(15,695	)			(19,403	)			22,906
Total provision for income taxes from continuing operations		$	107,246			$	97,472			$	139,007

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,
		2016				2015				2014
Provision at the statutory rate		$	107,690			$	80,036			$	149,697
Increases (decreases) resulting from —
State taxes			6,479				7,241				7,890
Foreign taxes			1,860				1,239				(13,059	)
Contingency reserves, net			(13,540	)			4,438				(650	)
Production activity deduction			(8,586	)			(6,871	)			(6,033	)
Employee per diems, meals and entertainment			8,764				8,727				9,817
Taxes on unincorporated joint ventures			(656	)			(3,838	)			(6,429	)
Asset impairments			1,909				7,047				—
Other			3,326				(547	)			(2,226	)
Total provision for income taxes from continuing operations		$	107,246			$	97,472			$	139,007

Deferred Tax Assets and Liabilities

Deferred income taxes result from temporary differences in the recognition of income and expenses for financial reporting purposes and tax purposes. The tax effects of these temporary differences, representing deferred tax assets and liabilities, result principally from the following (in thousands):

		December 31,
		2016				2015
Deferred income tax liabilities:
Property and equipment		$	(214,902	)		$	(189,793	)
Goodwill			(83,097	)			(69,059	)
Other intangibles			(33,566	)			(36,565	)
Other book/tax accounting method differences			(41,241	)			(61,095	)
Total deferred income tax liabilities			(372,806	)			(356,512	)
Deferred income tax assets:
Accruals and reserves			21,681				25,070
Accrued insurance			79,630				75,591
Stock and incentive compensation and pension withdrawal liabilities			58,744				52,009
Net operating loss carryforwards			37,362				27,255
Other			7,546				10,894
Subtotal			204,963				190,819
Valuation allowance			(14,991	)			(16,141	)
Total deferred income tax assets			189,972				174,678
Total net deferred income tax liabilities		$	(182,834	)		$	(181,834	)

Net Deferred Income Tax Assets and Liabilities

The net deferred income tax assets and liabilities were comprised of the following (in thousands):

		December 31,
		2016				2015
Deferred income taxes:
Assets		$	10,000			$	4,657
Liabilities			(192,834	)			(186,491	)
Total net deferred income tax liabilities		$	(182,834	)		$	(181,834	)

Reconciliation of Unrecognized Tax Benefit

A reconciliation of unrecognized tax benefit balances is as follows (in thousands):

		December 31,
		2016				2015				2014
Balance at beginning of year		$	54,541			$	50,668			$	48,306
Additions based on tax positions related to the current year			4,227				5,340				9,133
Additions for tax positions of prior years			2,048				292				2,438
Reductions for tax positions of prior years			(1,948	)			(132	)			—
Reductions for audit settlements			(180	)			(1,345	)			—
Reductions resulting from a lapse of the applicable statute of limitations periods			(23,448	)			(282	)			(9,209	)
Balance at end of year		$	35,240			$	54,541			$	50,668

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,
		2016				2015				2014
Unrecognized tax benefits		$	35,240			$	54,541			$	50,668
Portion that, if recognized, would reduce tax expense and effective tax rate			33,128				48,312				42,952
Accrued interest on unrecognized tax benefits			5,539				8,750				6,304
Accrued penalties on unrecognized tax benefits			650				673				697
Reasonably possible reduction to the balance of unrecognized tax benefits in succeeding 12 months		$	0 to $12,332			$	0 to $27,485			$	0 to $10,221
Portion that, if recognized, would reduce tax expense and effective tax rate		$	0 to $10,983			$	0 to $24,009			$	0 to $8,484

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