Income Taxes (Tables)

12 Months Ended

Dec. 31, 2018

Income Tax Disclosure [Abstract]

Schedule of (income) loss before income taxes

The following table presents the (income) loss before income taxes for the periods presented (in thousands): 

	For the Year Ended December 31,
	2018			2017			2016
Income attributable to common stockholders	$	(35,979	)	$	(137,842	)	$	(131,392	)
Loss attributable to noncontrolling interest and redeemable noncontrolling interests	286,843			413,104			395,968
Loss before income taxes	$	250,864		$	275,262		$	264,576

Schedule of income tax provision (benefit)

The income tax provision (benefit) consists of the following (in thousands):

	For the Year Ended December 31,
	2018			2017		2016
Current
Federal	$	(1,100	)	$	—	$	—
State	292			—		—
Total current expense	(808		)	—		—
Deferred
Federal	1,995			4,784		47,677
State	8,135			7,569		8,586
Total deferred provision	10,130			12,353		56,263
Total	$	9,322		$	12,353	$	56,263

Schedule of reconciliation of the statutory federal rate

The following table represents a reconciliation of the statutory federal rate and the Company’s effective tax rate for the periods presented:

	For the Year Ended December 31,
	2018		2017		2016
Tax provision (benefit) at federal statutory rate	(21.00	)%	(34.00	)%	(34.00	)%
State income taxes, net of federal benefit	0.32		1.94		2.99
Effect of noncontrolling and redeemable noncontrolling interests	24.01		51.03		50.88
Stock-based compensation	(1.77	)	0.70		0.69
Effect of prepaid tax asset	—		—		0.50
Tax credits	(1.35	)	(1.25	)	(1.63	)
Effect of federal rate change	—		(15.93	)	—
Effect of valuation allowance	3.04		0.81		0.25
Other	0.47		1.20		1.58
Total	3.72	%	4.50	%	21.26	%

Schedule of deferred tax assets and liabilities

The following table represents the components of the Company’s deferred tax assets and liabilities for the periods presented (in thousands):

	December 31,
	2018			2017
Deferred tax assets
Accruals and prepaids	$	18,871		$	14,387
Deferred revenue	—			7,602
Net operating loss carryforwards	288,039			187,038
Stock-based compensation	5,681			4,994
Investment tax and other credits	28,551			22,940
Interest Expense	9,614			—
Interest rate derivatives	1,282			1,640
Total deferred tax assets	352,038			238,601
Less: Valuation allowance	(10,506		)	(2,892		)
Gross deferred tax assets	341,532			235,709
Deferred tax liabilities
Deferred revenue	17,526			—
Capitalized initial direct costs	54,823			38,751
Fixed asset depreciation	218,701			173,175
Deferred tax on investment in partnerships	144,115			106,902
Gross deferred tax liabilities	435,165			318,828
Net deferred tax liabilities	$	(93,633	)	$	(83,119	)

Schedule of uncategorized tax benefits

The change in unrecognized tax benefits during 2018, 2017 and 2016, excluding penalties and interest, is as follows:

	For the Year Ended December 31,
	2018		2017	2016
Unrecognized tax benefits at beginning of the year	$1,525		$1,525	$1,525
Reversal of prior year unrecognized tax benefits due to the expiration of the statute of limitations	(878	)	—	—
Unrecognized tax benefits at end of the year	$647		$1,525	$1,525

Schedule of summarization of tax years that remain open and subject to examination by tax authorities

The following table summarizes the tax years that remain open and subject to examination by the tax authorities in the most significant jurisdictions in which the Company operates:

	Tax Years
U.S. Federal	2015 - 2018
State	2014 - 2018