Business and Summary of Significant Accounting Policies Warranty Liabilities (Tables)

12 Months Ended

Dec. 31, 2016

Standard Product Warranty Disclosure [Abstract]

Schedule of Product Warranty Liability [Table Text Block]

The activity in the accrued warranty liabilities account was as follows (in thousands): 

	2016			2015			2014
Balance at beginning of period	$	10,028		$	5,824		$	4,153
Additions charged to costs and expenses for current-year sales	9,034			9,368			9,437
Deductions from reserves	(10,016		)	(6,486		)	(8,118		)
Changes in liability for pre-existing warranties during the current year, including expirations	(413		)	1,322			352
Balance at end of period	$	8,633		$	10,028		$	5,824