Supplemental Cash Flow Information (Tables)

6 Months Ended

Jun. 30, 2017

Supplemental Cash Flow Elements [Abstract]

Supplemental Cash Flow Information

	Three months ended					Six months ended
	June 30, 2017			June 30, 2016		June 30, 2017		June 30, 2016
Supplemental disclosures:	(in thousands)
Interest paid	$	—		$	—	$	—	$	—
Income taxes paid	$	4,127		$	10,329	$	4,488	$	10,847
Non-cash investing and financing activities:
Non-cash capital expenditures	$	(874	)	$	1,047	$	224	$	1,312
Dividends declared	6,849			5,834		6,849		5,834