Income Taxes (Tables)

12 Months Ended

Dec. 31, 2015

Income tax benefit (expense) for the years ended December 31 is as follows:



	2015			2014			2013
Current income tax benefit (expense)
Federal	$	—		$	—		$	2,432
State	—			—			2,492
Foreign	(225		)	—			—
	(225		)	—			4,924
Deferred income tax benefit (expense)
Federal	24,151			(14,112		)	15,297
State	9,736			1,420			3,736
Foreign	1,035			9			—
Net operating loss carryforwards created	88,110			61,640			48,024
	123,032			48,957			67,057
Income tax benefit (expense) before valuation allowances	122,807			48,957			71,981
Deferred tax valuation allowances	(114,106		)	(52,529		)	(76,916		)
Income tax benefit (expense)	$	8,701		$	(3,572	)	$	(4,935	)

Effective income tax rate continuing operations tax rate reconciliation

A reconciliation of the reported amount of income tax expense to the amount computed by applying the statutory federal income tax rate to earnings from continuing operations before income taxes is as follows:



	2015			2014			2013
U.S. Federal income tax expense at a statutory rate of 35 percent	$	56,144		$	(30,139	)	$	(66,955	)
State taxes, net of federal income tax benefit	12,777			5,119			6,905
Tax position on government incentives	85,423			76,662			131,829
Goodwill impairment	(35,062		)	—			—
Bargain purchase gain	1,875			—			—
Other	1,650			(2,685		)	202
Total (expense) benefits for income taxes before valuation allowances	122,807			48,957			71,981
Valuation allowances	(114,106		)	(52,529		)	(76,916		)
Total benefit (expense) for income taxes	$	8,701		$	(3,572	)	$	(4,935	)

Tax effects of temporary differences that give rise to the Company's deferred tax assets and liabilities

The tax effects of temporary differences that give rise to the Company’s deferred tax assets and liabilities at December 31 are as follows:



	2015					2014
	Current		Noncurrent			Current			Noncurrent
Deferred Tax Assets:
Goodwill	$	—	$	39,172		$	—		$	13,716
Net operating loss carryforwards	—		243,865			—			154,020
Tax credit carryforwards	—		1,597			—			1,597
Start-up costs	—		988			—			1,111
Stock-based compensation	—		4,703			—			3,469
Terminal leases	—		3,859			—			4,229
Capitalized research and development	—		8,096			—			3,711
Accrued compensation	—		2,546			3,422			—
Inventory capitalization	—		2,046			1,600			—
Allowance for doubtful accounts	—		567			931			—
Other	—		1,569			56			1,474
Deferred tax assets	—		309,008			6,009			183,327
Deferred Tax Liabilities:
Prepaid expenses	—		(1,338		)	(1,239		)	—
Property, plant and equipment	—		(65,398		)	—			(53,133		)
Intangibles	—		(3,909		)	—			(3,018		)
Deferred revenue	—		—			(4,443		)	—
Convertible debt	—		(3,626		)	(4,599		)	—
Unrealized gain (loss) on available for sale investments	—		(1,752		)	(5,767		)	—
Other	—		(2,007		)	(527		)	(1,867		)
Deferred tax liabilities	—		(78,030		)	(16,575		)	(58,018		)
Net deferred tax assets (liabilities)	—		230,978			(10,566		)	125,309
Valuation allowance	—		(250,164		)	(4,333		)	(132,214		)
Net deferred taxes	$	—	$	(19,186	)	$	(14,899	)	$	(6,905	)

Valuation allowance for deferred tax assets

Activity regarding the valuation allowance for deferred tax assets was as follows:



	2015			2014		2013
Beginning of year balance	$	136,547		$	76,916	$	—
Changes in valuation allowance charged to income	114,106			52,529		76,916
Foreign currency translation	(773		)	—		—
Acquisition	284			7,102		—
End of year balance	$	250,164		$	136,547	$	76,916

Reconciliation of total amounts of unrecognized tax benefits

A reconciliation of the total amounts of unrecognized tax benefits at December 31 is as follows:



	2015		2014		2013
Beginning and end of year balance	$	1,900	$	1,900	$	1,900