Current Liabilities Warranty Schedule (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2015 USD ($)
Product Liability Contingency
Balance as of January 1, 2015	$ 30,738
Warranties provided during the period	8,436
Settlements made during the period	(13,098)
Changes in liability for pre-existing warranties during the period, including expirations	606
Balance as of September 30, 2015	$ 26,682