Commitments and Contingencies Warranty Account Activity (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Warranty Activity [Line Items]
Beginning balance	$ 50,632	$ 66,368	$ 53,605	$ 79,536
New product warranties	1,761	1,996	4,583	7,632
Other changes/adjustments to warranties	1,354	(1,552)	6,992	509
Claims activity	(8,283)	(12,050)	(18,671)	(31,625)
Effect of change in exchange rates	567	925	(478)	(365)
Ending balance	46,031	55,687	46,031	55,687
Less: current portion of warranty	20,102	32,834	20,102	32,834
Long-term warranty	$ 25,929	$ 22,853	$ 25,929	$ 22,853