Income Tax (Tables)

9 Months Ended

Sep. 30, 2019

Income Tax Disclosure [Abstract]

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

The provision for income tax expense differed from the amounts computed by applying the U.S. federal income tax statutory rate of 21.0% to pre-tax income as a result of the following for the three and nine months ended September 30, 2019 and 2018, respectively (dollars in thousands):

	Three months ended September 30,						Nine months ended September 30,
	2019			2018			2019			2018
Tax provision at U.S. statutory rate	$	72,889		$	67,759		$	172,984		$	148,654
Increase (decrease) in income taxes resulting from:
U.S. Tax Reform provisional adjustments	—			664			—			(2,685		)
U.S. Tax Reform valuation allowance adjustments	—			(58,949		)	—			(59,139		)
Foreign tax rate differing from U.S. tax rate	84			7,537			1,373			8,795
Differences in tax bases in foreign jurisdictions	(9,550		)	(2,371		)	(30,626		)	(9,264		)
Deferred tax valuation allowance	27,721			(5,334		)	50,607			5,357
Amounts related to tax audit contingencies	3,259			1,851			6,223			650
Corporate rate changes	116			(166		)	(1,621		)	30
Subpart F	(26		)	(99		)	440			211
Foreign tax credits	(651		)	(544		)	(759		)	(1,003		)
Global intangible low-taxed income, net of credit	—			7,624			—			11,916
Equity compensation excess benefit	(1,034		)	(817		)	(6,189		)	(5,067		)
Return to provision adjustments	(8,362		)	4,213			(4,400		)	4,108
Other, net	(121		)	94			729			(492		)
Total provision for income taxes	$	84,325		$	21,462		$	188,761		$	102,071
Effective tax rate	24.3		%	6.7		%	22.9		%	14.4		%