Employee Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2018

Defined Contribution Plan [Abstract]

Matching contributions [Table Text Block]

The table below sets forth our contributions for the past three years (in thousands):

	2018		2017		2016
Defined contribution and international retirement plans	$	7,239	$	6,946	$	5,817
Deferred compensation plan	245		325		194