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INCOME TAXES
3 Months Ended
Mar. 31, 2019
Income Tax Disclosure [Abstract]  
INCOME TAXES
INCOME TAXES
Effective income tax rate
 
Three Months Ended
March 31,
(Dollars in thousands)
2019
 
2018
Benefit from income taxes
$
(8,300
)
 
$
(4,222
)
Effective income tax rate
22
%
 
(53
)%

During the three months ended March 31, 2019, the Company’s effective income tax rate changed primarily due to the Global Intangible Low-Taxed Income (“GILTI”) and Base Erosion and Anti-Abuse Tax (“BEAT”) provisions of the Tax Reform Act. The Company’s effective income tax rate was also affected by excess tax benefits from stock-based compensation, an increase in U.S. research and development tax credits, and a decrease in uncertain tax positions as a result of the lapse of the statute of limitations on certain foreign reserves.