Commitments And Contingencies Product Warranty Liability (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Product Warranties Disclosures [Abstract]
Balance at the beginning of the period	$ 44,888	$ 48,754	$ 46,659
Product Warranty Accrual, Warranties Issued	80,085	62,709	69,755
Settlements made during the year	(68,267)	(66,575)	(67,660)
Balance at the end of the period	$ 56,706	$ 44,888	$ 48,754