Income Taxes (Tables)

12 Months Ended

Dec. 31, 2017

Income Tax Disclosure [Abstract]

Reconciliation of Effective Tax Rate to Federal Statutory Tax Rate

The following is a reconciliation of our effective tax rate to the federal statutory tax rate:

	Years Ended December 31,
	2017				2016			2015
U.S. federal statutory rate		34.9		%		35.0	%		35.0	%
Federal tax law changes		(82.7	)			-			-
State taxes, net of federal benefit		2.8				2.6		2.4
Federal and state incentives		(5.2	)		(0.2)			(0.5)
State law changes		1.5			0.3			(0.9)
Permanent differences		0.1				0.7		0.4
Net effective rate		(48.6	)	%		38.4	%		36.4	%

Summary of Provision for Income Taxes

The following is a summary of our provision for income taxes (in thousands):

	Years Ended December 31,
	2017			2016			2015
Current
Federal	$	(2,429	)	$	30,324		$	21,363
State and local		1,718			3,296			2,900
Foreign		59			108			284
		(652	)		33,728			24,547
Deferred
Federal		(46,247	)		11,981			16,538
State and local		2,686			971			(346	)
Foreign		(3	)		(64	)		(106	)
		(43,564	)		12,888			16,086
Total provision	$	(44,216	)	$	46,616		$	40,633

Summary of Deferred Tax Assets and Liabilities

The following is a summary of our deferred tax assets and liabilities (in thousands)

	December 31,
	2017			2016
Accrued compensation		9,441			20,651
Other reserves		6,736			8,580
Tax credit carryforwards		3,411			1,694
Operating loss carryforwards		1,388			1,399
Total gross deferred income taxes		20,976			32,324
Valuation allowances		(1,681	)		(456	)
Total deferred tax assets		19,295			31,868
Prepaids		(3,587	)		(3,401	)
Other receivables		(2,462	)		(3,051	)
Property and equipment		(79,224	)		(105,905	)
Goodwill		(55,117	)		(84,170	)
Total deferred tax liabilities		(140,390	)		(196,527	)
Total deferred taxes	$	(121,095	)	$	(164,659	)

Unrecognized Tax Benefits

A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in thousands):

	2017			2016
Gross unrecognized tax benefits - beginning of the year	$	1,832		$	1,139
Gross increases related to prior year tax positions		1,830			394
Gross increases related to current year tax positions		290			488
Lapse of applicable statute of limitations		(125	)		(189	)
Gross unrecognized tax benefits - end of year	$	3,827		$	1,832