Income Taxes (Tables)

6 Months Ended

Jun. 30, 2018

Income Tax Disclosure [Abstract]

Summary of Tax Expense and Effective Tax Rates

Income tax expense and effective tax rates were:

	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
	(in thousands, except effective tax rate)
Income before income taxes	$	37,377		$	29,586		$	64,589		$	45,534
Income tax expense	3,000			7,627			13,758			12,564
Effective tax rate	8.0		%	25.8		%	21.3		%	27.6		%