Income taxes (Tables)

12 Months Ended

Dec. 31, 2018

Income Tax Disclosure [Abstract]

Schedule of Income Before Provision for Income Taxes

Income before the provision for income taxes as shown in the accompanying consolidated statements of operations is as follows:

	Year Ended December 31,
	2018		2017		2016
Domestic	$	128,861	$	426,873	$	88,016
Foreign	2,943		2,308		1,892
Total income before the provision for income taxes	131,804		429,181		89,908

Schedule of Provision (Benefit) for Income Taxes

The provision (benefit) for income taxes consists of the following:

	Year Ended December 31,
	2018		2017			2016
Current:
Federal	$	178	$	(2,600	)	$	1,206
State	3,586		2,941			1,428
Foreign	945		817			421
Total current tax expense	4,709		1,158			3,055
Deferred:
Federal	22,757		365,470			11,633
State	946		6,857			3,755
Foreign	230		95			218
Total deferred tax expense	23,933		372,422			15,606
Provision for income taxes	$	28,642	$	373,580		$	18,661

Schedule of Reconciliation of U.S. Statutory Income Tax Rate to Company's Effective Tax Rate

A reconciliation of the U.S. statutory income tax rate to the Company’s effective tax rate is as follows:

	Year Ended December 31,
	2018		2017		2016
U.S. statutory tax rate	21.0	%	35.0	%	35.0	%
State and local taxes, net of federal benefit	5.9	%	1.0	%	4.9	%
State rate change impact on deferred taxes	(3.4	)%	0.8	%	(1.4	)%
Federal rate change impact on deferred taxes	—	%	77.8	%	—	%
Tax benefit arrangement liability adjustment	0.8	%	(25.8	)%	—	%
Foreign tax rate differential	0.2	%	—	%	(0.3	)%
Withholding taxes and other	(0.3	)%	0.1	%	—	%
Reserve for uncertain tax position	(0.2	)%	0.1	%	3.1	%
Income attributable to non-controlling interests	(2.3	)%	(1.9	)%	(20.5	)%
Effective tax rate	21.7	%	87.1	%	20.8	%

Schedule of Deferred Tax Assets and Liabilities

Details of the Company’s deferred tax assets and liabilities are summarized as follows:

	Year Ended December 31,
	2018			2017
Deferred tax assets:
Accrued expense and reserves	$	37		$	1,422
Deferred revenue	4,619			1,900
Goodwill and intangible assets	409,740			404,547
Net operating loss	—			603
Other	4,901			3,619
Deferred tax assets	$	419,297		$	412,091
Deferred tax liabilities:
Prepaid expenses	(922		)	(773		)
Property and equipment	(5,837		)	(5,165		)
Total deferred tax liabilities	$	(6,759	)	$	(5,938	)
Total deferred tax assets and liabilities	$	412,538		$	406,153
Reported as:
Deferred income taxes - non-current assets	$	414,841		$	407,782
Deferred income taxes - non-current liabilities	(2,303		)	(1,629		)
Total deferred tax assets and liabilities	$	412,538		$	406,153

Summary Of Changes In Unrecognized Tax Positions

A summary of the changes in the Company’s unrecognized tax positions is as follows:

	Year Ended December 31,
	2018			2017
Balance at beginning of year	$	2,608		$	2,608
Decrease related to prior year tax positions	(2,308		)	—
Balance at end of year	$	300		$	2,608

Schedule of Future Payments Under Tax Benefit Arrangements

Projected future payments under the tax benefit arrangements are as follows:

	Amount
2019	$	24,765
2020	24,996
2021	25,450
2022	25,975
2023	26,482
Thereafter	301,565
Total	$	429,233