Income Taxes (Tables)

9 Months Ended

Sep. 30, 2017

Income Tax Disclosure [Abstract]

Summary of Tax Expense and Effective Tax Rates

Income tax expense and effective tax rates were as follows:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
	(in thousands, except effective tax rate)
Income before income taxes	$	2,584		$	157		$	48,118		$	31,854
Income tax expense	955			1,690			13,519			7,704
Effective tax rate	37.0		%	1,076.4		%	28.1		%	24.2		%