Revenue Recognition Product Warranty Liability (Tables)

6 Months Ended

Jun. 30, 2020

Product Warranties Disclosures [Abstract]

Schedule of Product Warranty Liability [Table Text Block]

The changes in deferred service-type warranty revenue are as follows (in thousands):

Balance as of January 1, 2020	$	27,067
Additional warranty revenue deferred	20,845
Warranty revenue recognized	(22,473)
Balance as of June 30, 2020	$	25,439