Commitments and Contingencies Warranty Account Activity (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Warranty Activity [Line Items]
Beginning balance	$ 42,549	$ 50,632	$ 45,146	$ 53,605
New product warranties	2,278	1,761	4,992	4,583
Other changes/adjustments to warranties	2,632	1,354	3,686	6,992
Claims activity	(5,605)	(8,283)	(12,113)	(18,671)
Effect of change in exchange rates	(1,500)	567	(1,357)	(478)
Ending balance	40,354	46,031	40,354	46,031
Less: current portion of warranty	22,283	20,102	22,283	20,102
Long-term warranty	$ 18,071	$ 25,929	$ 18,071	$ 25,929