Income Taxes (Tables)

9 Months Ended

Sep. 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 September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
	(in thousands, except effective tax rate)
Income before income taxes	$	14,584		$	2,584		$	79,173		$	48,118
Income tax expense	4,092			955			17,850			13,519
Effective tax rate	28.1		%	37.0		%	22.5		%	28.1		%