Statement Of Cash Flow Information (Tables)

12 Months Ended

Dec. 31, 2017

Supplemental Cash Flow Information [Abstract]

Schedule of supplemental cash flow information

The following table provides supplemental cash flow information (in thousands): 

	Year Ended December 31,
	2017		2016		2015
Interest paid, net of interest capitalized	$	10,367	$	18,749	$	14,555
Income taxes paid	6,015		5,635		16,905