Supplemental Cash Flow Information (Tables)

12 Months Ended

Dec. 31, 2016

Supplemental Cash Flow Elements [Abstract]

Supplemental Cash Flow Information

	Years Ending December 31,
	2016		2015		2014
Supplemental disclosures:	(in thousands)
Interest paid	$	—	$	—	$	—
Income taxes paid, net	27,353		24,125		26,456
Non-cash investing and financing activities:
Non-cash capital expenditures	270		83		(79		)