INCOME TAXES (Tables)

12 Months Ended

Dec. 31, 2019

Income Tax Disclosure [Abstract]

Significant Components of the Provision for Income Tax Expense (Benefit)

Significant components of the provision for income tax expense (benefit) are as follows:

	Year Ended December 31,
	2019		2018		2017
	(in thousands)
Current:
Federal	$	—	$	(55)	$	(702)
Foreign	61,834		40,239		50,970
State	5,523		6,828		4,117
Total current	67,357		47,012		54,385
Deferred:
Federal	5,314		2,246		(56,442)
Foreign	(6,345)		(8,697)		(15,841)
State	566		204		744
Total deferred	(465)		(6,247)		(71,539)
Income tax expense (benefit)	$	66,892	$	40,765	$	(17,154)

Significant Components of Deferred Tax Liabilities and Assets

Significant components of our deferred tax liabilities and assets are as follows:

	December 31,
	2019		2018
	(in thousands)
Deferred tax liabilities:
Leases	$	192,870	$	—
Intangible assets	161,843		118,275
Prepaid expenses	5,876		2,534
Other	19,186		5,865
Total deferred tax liabilities	379,775		126,674
Deferred tax assets:
Intangible assets	40,926		25,981
Accrued expenses	60,479		40,989
Net operating loss carryforwards	488,081		388,459
Foreign tax and other credit carryforwards	47,215		38,919
Equity compensation	22,503		24,211
Leases	211,206		—
Other	12,751		15,703
Total gross deferred tax assets	883,161		534,262
Valuation allowance	667,242		530,642
Total deferred tax assets	215,919		3,620
Net deferred tax liabilities	$	(163,856)	$	(123,054)

Reconciliation of Income Taxes at the United States Statutory Rate to Income Tax Expense

The reconciliation of income tax computed at the United States federal statutory rates to income tax expense (benefit) is:

	Year Ended December 31,
	2019		2018		2017
	(in thousands)
Income tax expense (benefit) at United States statutory rates (21%, 21% and 35%, respectively)	$	38,872	$	27,532	$	(3,283)
State income taxes, net of federal tax benefits	3,137		4,860		1,544
Differences between foreign and United States statutory rates	6,384		2,650		(10,887)
United States tax reform rate change	—		—		(55,685)
Non-United States income inclusions and exclusions	(3,222)		(3,425)		3,826
United States income inclusions and exclusions	(2,582)		(13,790)		11,347
Nondeductible items	10,118		26,376		11,380
Tax contingencies	(1,340)		389		1,955
Tax expense from acquired goodwill	6,107		4,353		4,489
Change in valuation allowance	8,536		(8,845)		18,067
Other, net	882		665		93
	$	66,892	$	40,765	$	(17,154)

Summary of Activity Related to Unrecognized Tax Benefits

The following table summarizes the activity related to the Company’s unrecognized tax benefits:

	Year Ended December 31,
	2019		2018		2017
	(in thousands)
Balance at January 1	$	34,071	$	30,630	$	15,117
Additions:
Increase for current year positions	2,215		1,531		807
Increase for prior year positions	1,898		2,995		15,498
Interest and penalties for prior years	458		106		2,745
Reductions:
Decrease for prior year positions	(3,272)		—		—
Expiration of applicable statute of limitations	—		(730)		(1,233)
Settlements for prior year positions	(13,852)		(9)		(2,033)
Foreign exchange	205		(452)		(271)
Balance at December 31	$	21,723	$	34,071	$	30,630