Income Taxes - (Tables)

12 Months Ended

Dec. 31, 2017

Income Tax Disclosure [Abstract]

Summarized Statement of Components of Income Tax Provision

The income tax provision for the years ended December 31, 2017, 2016 and 2015, is comprised of the following components:

	For the Year Ended December 31, 2017
	Federal			State			Total
Current expense	$	5,677		$	1,662		$	7,339
Tax credits/true-up	(5,573		)	(383		)	(5,956		)
Change in deferred expense	1,700			542			2,242
Total tax expense	$	1,804		$	1,821		$	3,625

	For the Year Ended December 31, 2016
	Federal			State			Total
Current expense	$	14,627		$	2,368		$	16,995
Tax credits/true-up	(312		)	—			(312		)
Change in deferred benefit	(369		)	(467		)	(836		)
Total tax expense	$	13,946		$	1,901		$	15,847

	For the Year Ended December 31, 2015
	Federal		State			Total
Current expense	$	3,736	$	1,640		$	5,376
Tax credits/true-up	274		—			274
Change in deferred expense (benefit)	7,016		(1,518		)	5,498
Total tax expense	$	11,026	$	122		$	11,148

Schedule of Reconciliation of Statutory Income Tax Provisions to the Effective Income Tax Provisions

A reconciliation of the statutory income tax provisions to the effective income tax provisions for the periods indicated is as follows:

	For the Year Ended December 31,
	2017					2016					2015
Expected tax at statutory rate	$	186,274		35.0	%	$	144,708		35.0	%	$	77,151		35.0	%
Non-taxable REIT income	(170,811		)	(32.1	)%	(131,112		)	(31.7	)%	(67,084		)	(30.4	)%
State and local tax expense - net of federal benefit	2,306			0.4	%	2,399			0.6	%	1,249			0.6	%
Change in valuation allowance	159			—	%	(845		)	(0.2	)%	(624		)	(0.3	)%
Tax credits/true-up	(5,956		)	(1.1	)%	(312		)	(0.1	)%	274			0.1	%
Remeasurement of deferred balances	(8,460		)	(1.6	)%	—			—	%	—			—	%
Miscellaneous	113			—	%	1,009			0.2	%	182			0.1	%
Total provision	$	3,625		0.6	%	$	15,847		3.8	%	$	11,148		5.1	%

Schedule of Major Sources of Temporary Differences Stated at their Deferred Tax Effects

The major sources of temporary differences stated at their deferred tax effects are as follows:

	December 31, 2017			December 31, 2016
Deferred tax liabilities:
Fixed assets	$	(15,271	)	$	(16,488	)
Other	(108		)	(201		)
State deferred taxes	(2,822		)	(1,242		)
Total deferred tax liabilities	(18,201		)	(17,931		)
Deferred tax assets:
Captive insurance subsidiary	252			413
Accrued liabilities	873			2,741
Stock compensation	1,287			1,713
Solar credit	43			—
Other	57			1,548
SmartStop TRS	219			365
State deferred taxes	7,802			6,078
Total deferred tax assets	10,533			12,858
Valuation allowance	(4,924		)	(4,765		)
Net deferred income tax liabilities	$	(12,592	)	$	(9,838	)