Income Tax (Tables)

3 Months Ended

Mar. 31, 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% to pre-tax income as a result of the following for the three months ended March 31, 2019 and 2018, respectively (dollars in thousands):

	Three months ended March 31,
	2019			2018
Tax provision at U.S. statutory rate	$	45,478		$	28,964
Increase (decrease) in income taxes resulting from:
U.S. Tax Reform	—			775
Foreign tax rate differing from U.S. tax rate	664			1,432
Differences in tax bases in foreign jurisdictions	(15,078		)	(5,760		)
Deferred tax valuation allowance	18,544			7,947
Amounts related to tax audit contingencies	560			835
Corporate rate changes	(1,764		)	111
Subpart F	165			658
Foreign tax credits	—			(572		)
Global intangible low-taxed income, net of credit	—			4,409
Equity compensation excess benefit	(1,461		)	(1,114		)
Other, net	(51		)	10
Total provision for income taxes	$	47,057		$	37,695
Effective tax rate	21.7		%	27.3		%