Income Taxes (Tables)

9 Months Ended

Sep. 30, 2018

Income Tax Disclosure [Abstract]

Summary of Income Tax Expense and Effective Tax Rate

Income tax expense and the effective tax rate for the three and nine months ended September 30, 2018 and 2017 were as follows (dollar amounts in thousands):

	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
Income tax expense	$	16,821		$	11,030		$	45,521		$	42,546
Effective tax rate		13.7	%		9.4	%		13.0	%		12.9	%